Transfer of thermal energy — Paper 1 · IGCSE Physics 0625

18 An iron bar is held with one end in a fire. The other end soon becomes too hot to hold. hand fire iron bar How has the heat travelled along the iron bar? A by conduction B by convection C by expansion D by radiation

1 marks

Answer: A

This question in 0625/11 May/June 2005

17 The diagram shows a cooling unit in a refrigerator. cooling unit Why is the cooling unit placed at the top? A Cold air falls and warm air is displaced upwards. B Cold air is a bad conductor so heat is not conducted into the refrigerator. C Cold air is a good conductor so heat is conducted out of the refrigerator. D Cold air stops at the top and so prevents convection.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2005

18 How does heat from the Sun reach the Earth? A conduction only B convection only C radiation only D conduction, convection and radiation

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2005

18 A beaker contains water at room temperature. X water Y How could a convection current be set up in the water? A cool the water at X B cool the water at Y C stir the water at X D stir the water at Y

1 marks

Answer: A

This question in 0625/11 May/June 2006

19 Two plastic cups are placed one inside the other. Hot water is poured into the inner cup and a lid is put on top as shown. lid small spacer small air gap hot water bench Which statement is correct? A Heat loss by radiation is prevented by the small air gap. B No heat passes through the sides of either cup. C The bench is heated by convection from the bottom of the outer cup. D The lid is used to reduce heat loss by convection.

1 marks

Answer: D

This question in 0625/11 May/June 2006

17 Bread can be cooked by placing it below, but not touching, a heating element. heating element bread Which process transfers thermal energy from the heating element to the bread? A conduction B convection C insulation D radiation

1 marks

Answer: D

This question in 0625/11 May/June 2007

18 The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. cooling unit What happens to the density of this air as it cools and how does it move? density of the air movement of the air A decreases moves down B decreases stays where it is C increases moves down D increases stays where it is

1 marks

Answer: C

This question in 0625/11 May/June 2007

18 Which statement refers to convection? A It does not involve energy transfer. B It is the transfer of heat energy without the movement of particles. C It only occurs in liquids or gases. D It only occurs in solids.

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2007

19 Spoons made of different materials were placed in four cups of coffee poured from the same jug. Which spoon will be hottest to touch at end X? experiment A experiment B experiment C experiment D wooden X steel X white plastic X black plastic X spoon spoon spoon spoon

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2007

18 A heater is placed in a room. Which diagram shows the movement of air as the room is heated? A B C D

1 marks

Answer: A

This question in 0625/11 May/June 2008

19 The diagrams show four identical pieces of ice that are heated in test-tubes of water. In which test-tube will the ice take the longest time to melt? A B ice water water ice wrapped in lead wire C D ice water water ice wrapped in lead wire

1 marks

Answer: B

This question in 0625/11 May/June 2008

18 A cup with a lid contains a hot drink. lid hot drink When the lid is removed, the rate of heat loss from the drink increases. What causes this? A convection only B evaporation only C both convection and evaporation D neither convection nor evaporation

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2008

19 A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. wall cupboard heater air moves through gap floor Which line in the table describes the temperature and the direction of the air that moves through the gap? air temperature air direction A cool away from the heater B cool towards the heater C warm away from the heater D warm towards the heater

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2008

17 A rod is made up of copper and wood joined together. After the rod is heated at the join in the centre for about a minute, where would the lowest temperature be? B C A D wood copper

1 marks

Answer: A

This question in 0625/11 May/June 2009

18 The diagram shows a fire. Why does the smoke rise above the fire? A Smoke evaporates more quickly at higher temperatures. B Smoke molecules diffuse more quickly at higher temperatures. C The density of the air is lower at higher temperatures. D The pressure of the air is greater at higher temperatures.

1 marks

Answer: C

This question in 0625/11 May/June 2009

17 A beaker contains water at room temperature. X water Y How could a convection current be set up in the water? A cool the water at X B cool the water at Y C stir the water at X D stir the water at Y

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2009

18 A student warms her hands near a fire. Which waves carry most heat to her hands and are these waves electromagnetic? waves electromagnetic A infra-red no B infra-red yes C visible light no D visible light yes

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2009

17 A student warms her hands near a fire. Which waves carry most heat to her hands and are these waves electromagnetic? waves electromagnetic A infra-red no B infra-red yes C visible light no D visible light yes

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2009

18 A beaker contains water at room temperature. X water Y How could a convection current be set up in the water? A cool the water at X B cool the water at Y C stir the water at X D stir the water at Y

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2009

18 Hot liquid in a vacuum flask cools extremely slowly. This is because some methods of heat transfer cannot take place in a vacuum. Which methods cannot take place in a vacuum? A conduction and convection only B conduction and radiation only C convection and radiation only D conduction, convection and radiation

1 marks

Answer: A

This question in 0625/11 May/June 2010

19 A teacher demonstrates convection currents using a box with two chimneys and a lighted candle. She holds a smoking taper at point P. In which direction does the convection current cause the smoke to move? B P A C chimney chimney D

1 marks

Answer: D

This question in 0625/11 May/June 2010

15 Hot liquid in a vacuum flask cools extremely slowly. This is because some methods of heat transfer cannot take place in a vacuum. Which methods cannot take place in a vacuum? A conduction and convection only B conduction and radiation only C convection and radiation only D conduction, convection and radiation

1 marks

Answer: A

This question in 0625/12 May/June 2010

16 A teacher demonstrates convection currents using a box with two chimneys and a lighted candle. She holds a smoking taper at point P. In which direction does the convection current cause the smoke to move? B P A C chimney chimney D

1 marks

Answer: D

This question in 0625/12 May/June 2010

18 A piece of wood has some iron nails pushed through it. One side of the wood is covered with heat sensitive paper which turns from pink to blue when heated. The wood is heated as shown for a few minutes and blue dots appear on the heat sensitive paper where it touches the nails. wood heat sensitive paper iron blue heat nails dots This experiment shows that, compared to wood, iron is a good A absorber of heat. B conductor of heat. C convector of heat. D emitter of heat.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2010

19 An electric heater is placed inside a metal box which has one side open. The diagram shows four possible positions for the box. The heater is switched on for several minutes. In which position does the box become the hottest? A B C D heater heater box box

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2010

16 An electric heater is placed inside a metal box which has one side open. The diagram shows four possible positions for the box. The heater is switched on for several minutes. In which position does the box become the hottest? A B C D heater heater box box

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2010

17 A block of ice cream is prevented from melting by wrapping it in newspaper soaked in water. The water evaporates from the newspaper. Which molecules escape from the water and what happens to the average speed of the water molecules that remain in the newspaper? average speed of the escaping molecules remaining water molecules A the more energetic ones decreases B the more energetic ones increases C the less energetic ones decreases D the less energetic ones increases

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2010

18 A piece of wood has some iron nails pushed through it. One side of the wood is covered with heat sensitive paper which turns from pink to blue when heated. The wood is heated as shown for a few minutes and blue dots appear on the heat sensitive paper where it touches the nails. wood heat sensitive paper iron blue heat nails dots This experiment shows that, compared to wood, iron is a good A absorber of heat. B conductor of heat. C convector of heat. D emitter of heat.

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2010

14 An electric heater is placed inside a metal box which has one side open. The diagram shows four possible positions for the box. The heater is switched on for several minutes. In which position does the box become the hottest? A B C D heater heater box box

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2010

19 A piece of wood has some iron nails pushed through it. One side of the wood is covered with heat sensitive paper which turns from pink to blue when heated. The wood is heated as shown for a few minutes and blue dots appear on the heat sensitive paper where it touches the nails. wood heat sensitive paper iron blue heat nails dots This experiment shows that, compared to wood, iron is a good A absorber of heat. B conductor of heat. C convector of heat. D emitter of heat.

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2010

17 An experiment is set up to find out which metal is the best conductor of heat. Balls are stuck with wax to rods made from different metals, as shown in diagram 1. The rods are heated at one end. Some of the balls fall off, leaving some as shown in diagram 2. Which labelled metal is the best conductor of heat? diagram 1 diagram 2 A B C D heated end heated end before heating after heating

1 marks

Answer: A

This question in 0625/11 May/June 2011

18 Food is kept in a cool-box which uses two ice packs to keep it cool. Where should the ice packs be placed to keep all the food as cool as possible? A both at the bottom of the box B both at the top of the box C one at the front and one at the back of the box D one on the left and one on the right of the box

1 marks

Answer: B

This question in 0625/11 May/June 2011

10 An experiment is set up to find out which metal is the best conductor of heat. Balls are stuck with wax to rods made from different metals, as shown in diagram 1. The rods are heated at one end. Some of the balls fall off, leaving some as shown in diagram 2. Which labelled metal is the best conductor of heat? diagram 1 diagram 2 A B C D heated end heated end before heating after heating

1 marks

Answer: A

This question in 0625/12 May/June 2011

20 Food is kept in a cool-box which uses two ice packs to keep it cool. Where should the ice packs be placed to keep all the food as cool as possible? A both at the bottom of the box B both at the top of the box C one at the front and one at the back of the box D one on the left and one on the right of the box

1 marks

Answer: B

This question in 0625/12 May/June 2011

10 An experiment is set up to find out which metal is the best conductor of heat. Balls are stuck with wax to rods made from different metals, as shown in diagram 1. The rods are heated at one end. Some of the balls fall off, leaving some as shown in diagram 2. Which labelled metal is the best conductor of heat? diagram 1 diagram 2 A B C D heated end heated end before heating after heating

1 marks

Answer: A

This question in 0625/13 May/June 2011

20 Food is kept in a cool-box which uses two ice packs to keep it cool. Where should the ice packs be placed to keep all the food as cool as possible? A both at the bottom of the box B both at the top of the box C one at the front and one at the back of the box D one on the left and one on the right of the box

1 marks

Answer: B

This question in 0625/13 May/June 2011

19 After a sheep has its wool cut off, it is harder for it to stay warm when the air temperature falls. How does the wool help the sheep to stay warm? A Air can circulate between the wool fibres and heat up the skin by convection. B Air trapped by the wool fibres reduces heat losses from the skin by convection. C The wool fibres are curly so it takes longer for heat to be conducted away from the skin. D The wool fibres conduct heat to the skin from the air outside.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2012

20 A boy sits near a campfire. He pokes the fire with an iron bar. His hand becomes hot. iron bar In which ways does thermal energy (heat) from the fire reach his hand? A conduction and convection only B conduction and radiation only C convection and radiation only D conduction, convection and radiation

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2012

16 A boy sits near a campfire. He pokes the fire with an iron bar. His hand becomes hot. iron bar In which ways does thermal energy (heat) from the fire reach his hand? A conduction and convection only B conduction and radiation only C convection and radiation only D conduction, convection and radiation

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2012

19 After a sheep has its wool cut off, it is harder for it to stay warm when the air temperature falls. How does the wool help the sheep to stay warm? A Air can circulate between the wool fibres and heat up the skin by convection. B Air trapped by the wool fibres reduces heat losses from the skin by convection. C The wool fibres are curly so it takes longer for heat to be conducted away from the skin. D The wool fibres conduct heat to the skin from the air outside.

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2012

19 A convector heater is fixed to a wall. Which diagram shows how warm air near the heater moves because of convection in the air? A B wall wall heater heater movement of air movement of air C D wall movement wall of air movement of air heater heater

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2012

20 A double-glazed window consists of two panes of glass with a vacuum between them. The vacuum reduces the amount of thermal energy transferred through the window. vacuum glass glass Which row shows how much thermal energy is transferred through the vacuum by conduction, by convection and by radiation? conduction convection radiation A none none some B none some some C some none none D some some none

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2012

17 The diagram shows the cross-section of a vacuum flask containing a hot liquid in a cold room. X and Y are points on the inside surfaces of the walls of the flask. cold room X Y hot liquid vacuum How is thermal energy transferred between X and Y? A by conduction and convection B by conduction only C by radiation and convection D by radiation only

1 marks

Answer: D

This question in 0625/11 May/June 2013

18 The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. cooling unit What happens to the density of the air as it cools, and how does it move? density of the air movement of the air A decreases moves down B decreases stays at the top C increases moves down D increases stays at the top

1 marks

Answer: C

This question in 0625/11 May/June 2013

17 Which statement about the transfer of thermal energy is correct? A Convection can occur in air, but only when the air is trapped. B Convection can only occur in a gas. C Radiation cannot occur in air. D Radiation can occur in a vacuum, but convection cannot.

1 marks

Answer: D

This question in 0625/12 May/June 2013

18 The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. cooling unit What happens to the density of the air as it cools, and how does it move? density of the air movement of the air A decreases moves down B decreases stays at the top C increases moves down D increases stays at the top

1 marks

Answer: C

This question in 0625/12 May/June 2013

17 The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. cooling unit What happens to the density of the air as it cools, and how does it move? density of the air movement of the air A decreases moves down B decreases stays at the top C increases moves down D increases stays at the top

1 marks

Answer: C

This question in 0625/13 May/June 2013

18 The diagram shows the cross-section of a vacuum flask containing a hot liquid in a cold room. X and Y are points on the inside surfaces of the walls of the flask. cold room X Y hot liquid vacuum How is thermal energy transferred between X and Y? A by conduction and convection B by conduction only C by radiation and convection D by radiation only

1 marks

Answer: D

This question in 0625/13 May/June 2013

17 A man goes into a cold room and switches on a heater. The man then stands one metre away from the heater. He feels warmer almost immediately. room heater How is thermal energy transferred from the heater to the man so quickly? A by conduction, convection and radiation B by conduction only C by convection only D by radiation only

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2013

18 A rod is made half of glass and half of copper. Four pins, A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. Which pin falls off first? glass copper pin pin pin pin A B C D heat

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2013

17 A rod is made half of glass and half of copper. Four pins, A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. Which pin falls off first? glass copper pin pin pin pin A B C D heat

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2013

18 A man goes into a cold room and switches on a heater. The man then stands one metre away from the heater. He feels warmer almost immediately. room heater How is thermal energy transferred from the heater to the man so quickly? A by conduction, convection and radiation B by conduction only C by convection only D by radiation only

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2013

17 A piece of hot metal is held by a clamp in a cold room. The air next to the metal becomes hot. The density of the air changes and the air moves. clamp hot metal Which row shows the density change of the air and the direction in which the air moves? density of air movement of air A decreases downwards B decreases upwards C increases downwards D increases upwards

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2013

18 A rod is made half of glass and half of copper. Four pins, A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. Which pin falls off first? glass copper pin pin pin pin A B C D heat

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2013

16 Which statement about the transfer of thermal energy is correct? A All metals conduct thermal energy equally well. B Convection can only occur in solids or liquids. C Convection occurs in liquids because hot liquid is more dense than cold liquid. D The radiation that transfers thermal energy is a type of electromagnetic radiation.

1 marks

Answer: D

This question in 0625/11 May/June 2014

17 The diagram shows a heater above a thermometer. The thermometer bulb is in the position shown. heater air thermometer thermometer bulb Which row shows how the heat energy from the heater reaches the thermometer bulb? conduction convection radiation A yes yes no B yes no yes C no yes no D no no yes

1 marks

Answer: D

This question in 0625/11 May/June 2014

17 The diagram shows an air-conditioning unit on the wall of a room. The unit draws in warm air from the room and releases cold air into the room. air-conditioning unit What happens to the cold air and why? cold air why? A falls it is less dense than warm air B falls it is more dense than warm air C rises it is less dense than warm air D rises it is more dense than warm air

1 marks

Answer: B

This question in 0625/12 May/June 2014

18 Which statement about thermal radiation is correct? A It can only occur in a vacuum. B It involves movement of electrons through a material. C It involves movement of atoms. D It is infra-red radiation.

1 marks

Answer: D

This question in 0625/12 May/June 2014

12 The diagram shows a heater above a thermometer. The thermometer bulb is in the position shown. heater air thermometer thermometer bulb Which row shows how the heat energy from the heater reaches the thermometer bulb? conduction convection radiation A yes yes no B yes no yes C no yes no D no no yes

1 marks

Answer: D

This question in 0625/13 May/June 2014

13 Which statement about the transfer of thermal energy is correct? A All metals conduct thermal energy equally well. B Convection can only occur in solids or liquids. C Convection occurs in liquids because hot liquid is more dense than cold liquid. D The radiation that transfers thermal energy is a type of electromagnetic radiation.

1 marks

Answer: D

This question in 0625/13 May/June 2014

17 The metal surface of a kettle is hot. What happens to the cool air outside the kettle when it comes into contact with the hot kettle? A The density of the air decreases and the air falls. B The density of the air decreases and the air rises. C The density of the air increases and the air falls. D The density of the air increases and the air rises.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2014

18 One type of double glazing consists of two panes of glass separated by a vacuum. glass glass vacuum Which method or methods of energy transfer are prevented by the vacuum? A conduction and convection B conduction and radiation C convection and radiation D radiation only

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2014

14 The metal surface of a kettle is hot. What happens to the cool air outside the kettle when it comes into contact with the hot kettle? A The density of the air decreases and the air falls. B The density of the air decreases and the air rises. C The density of the air increases and the air falls. D The density of the air increases and the air rises.

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2014

18 One type of double glazing consists of two panes of glass separated by a vacuum. glass glass vacuum Which method or methods of energy transfer are prevented by the vacuum? A conduction and convection B conduction and radiation C convection and radiation D radiation only

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2014

17 Two methods by which thermal energy can be transferred are conduction and radiation. Which statement is correct? A Conduction involves density changes in fluids. B Conduction only occurs in solids. C Radiation cannot occur in a vacuum. D Radiation involves electromagnetic waves.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2014

18 A heater is to be fitted in a room to warm the air throughout the room. The diagram shows two possible positions to fit the heater, P and Q. position Q room position P Which position is better and why? position why? A P warmer air is less dense and rises B P warmer air is more dense and rises C Q warmer air is less dense and falls D Q warmer air is more dense and falls

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2014

16 What is the name of the process of heat transfer using electromagnetic waves? A conduction B convection C evaporation D radiation

1 marks

Answer: D

This question in 0625/12 Feb/March 2015

17 Ice is trapped by a metal gauze at the bottom of a tube containing water. The water is heated strongly at the top, but the ice only melts very slowly. water boiling metal gauze heat ice Why does the ice melt so slowly? A Heat energy always travels upwards. B Hot water is more dense than cold water. C Metal gauze does not allow heat to pass through. D Water is a poor conductor of heat.

1 marks

Answer: D

This question in 0625/12 Feb/March 2015

16 Thermal energy travels through space from the Sun to the Earth. Space is a vacuum. How is thermal energy transferred from the Sun to the Earth? A by conduction only B by convection only C by radiation only D by convection and radiation

1 marks

Answer: C

This question in 0625/11 May/June 2015

17 A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. wall cupboard heater air moves through gap floor Which row describes the temperature, and the direction of movement, of the air in the gap? air temperature air direction A cool away from the heater B cool towards the heater C warm away from the heater D warm towards the heater

1 marks

Answer: B

This question in 0625/11 May/June 2015

16 The diagram shows a vacuum flask used to keep liquid hot. vacuum hot liquid How does thermal energy pass through the vacuum? A conduction only B convection only C radiation D conduction and convection

1 marks

Answer: C

This question in 0625/12 May/June 2015

17 A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. wall cupboard heater air moves through gap floor Which row describes the temperature, and the direction of movement, of the air in the gap? air temperature air direction A cool away from the heater B cool towards the heater C warm away from the heater D warm towards the heater

1 marks

Answer: B

This question in 0625/12 May/June 2015

16 One method of heat transfer involves the energy travelling at a much greater speed than in other methods. What is the name of this method? A conduction B convection C evaporation D radiation

1 marks

Answer: D

This question in 0625/13 May/June 2015

17 A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. wall cupboard heater air moves through gap floor Which row describes the temperature, and the direction of movement, of the air in the gap? air temperature air direction A cool away from the heater B cool towards the heater C warm away from the heater D warm towards the heater

1 marks

Answer: B

This question in 0625/13 May/June 2015

21 Radiation from the Sun is dispersed by a prism. The prism does not absorb any of the radiation. Four identical thermometers are placed, one at each of the labelled positions. In which position does the thermometer show the greatest rise in temperature? prism radiation from the Sun A B red light C violet light D

1 marks

Answer: A

This question in 0625/13 May/June 2015

16 One method of heat transfer involves the energy travelling at a much greater speed than in other methods. What is the name of this method? A conduction B convection C evaporation D radiation

1 marks

Answer: D

This question in 0625/14 May/June 2015

18 The diagram shows a block of ice placed in a warm room. At which point is the temperature the lowest? A B clamp C ice table D

1 marks

Answer: D

This question in 0625/14 May/June 2015

16 The air in a room is heated by a heater. The diagram shows the circulation of the air in the room. circulation of air room heater Which statement about the air that is heated is correct? A The air contracts and becomes less dense. B The air contracts and becomes more dense. C The air expands and becomes less dense. D The air expands and becomes more dense.

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2015

17 Four rods are made from different metals P, Q, R and S. The rods have equal lengths and equal diameters. The rods are heated at one end, in the same way. The table shows the time taken for the temperature at the other end of each rod to rise by 1.0 °C. Which metal is the best conductor of thermal energy (heat)? metal time taken / s P 35 Q 30 R 45 S 40 A metal P B metal Q C metal R D metal S

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2015

16 In a refrigerator, the cooling unit can be fitted either at the top or at the bottom. In an oven, the heater can be fitted either at the top or at the bottom. Which row shows the best position for the cooling unit and the best position for the heater? cooling unit heater A bottom bottom B bottom top C top bottom D top top

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2015

17 A girl is outdoors. She warms her hands by holding them near a fire, as shown. hands fire How does the heat from the fire reach her hands? A conduction only B convection and conduction C convection and radiation D radiation only

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2015

13 A swimmer feels cold after leaving warm water on a warm, windy day. Why does she feel cold even though the air is warm? A The less energetic water molecules on her skin escape quickly. B The more energetic water molecules on her skin do not escape quickly. C The water on her skin does not evaporate quickly enough to keep her warm. D The water on her skin evaporates quickly and cools her skin.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2015

16 A heating engineer fits a heater to the ceiling of an office so that workers in the office are kept warm. How does thermal energy reach the workers below the heater? A conduction and convection B convection and radiation C convection only D radiation only

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2015

17 Which row shows how heating changes the density of air, and the name of the method of energy transfer caused by this density change? density method of energy transfer A decreases conduction B decreases convection C increases conduction D increases convection

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2015

19 A cotton sheet is ironed with a hot electric iron. How is energy transferred through the metal base of the iron to the sheet? A by conduction only B by convection only C by radiation only D by convection and radiation only

1 marks

Answer: A

This question in 0625/12 Feb/March 2016

20 Two plastic cups are placed one inside the other. A small spacer keeps the two cups separated. Hot water is poured into the inner cup and a lid is put on top, as shown. lid small spacer small air gap hot water bench Which statement is correct? A The bench is heated by convection from the bottom of the outer cup. B The lid reduces the energy lost by convection. C There is no thermal conduction through the sides of either cup. D Thermal radiation is prevented by the small air gap.

1 marks

Answer: B

This question in 0625/12 Feb/March 2016

19 A liquid is heated in a beaker. liquid heating The density of the liquid changes as its temperature increases. This causes energy to be transferred throughout the liquid. How does the density change and what is this energy transfer process? energy transfer density process A decreases conduction B decreases convection C increases conduction D increases convection

1 marks

Answer: B

This question in 0625/11 May/June 2016

20 A rod is made half of glass and half of copper. Four pins A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. The pins fall off when the wax melts. Which pin falls off first? glass copper pin pin pin pin A B C D heat

1 marks

Answer: C

This question in 0625/11 May/June 2016

19 Which process involves convection? A bread toasting under a grill B energy from the Sun warming a road surface C hot air rising to the top of a cool room D thermal energy transfer through a copper bar

1 marks

Answer: C

This question in 0625/12 May/June 2016

20 A rod is made half of glass and half of copper. Four pins A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. The pins fall off when the wax melts. Which pin falls off first? glass copper pin pin pin pin A B C D heat

1 marks

Answer: C

This question in 0625/12 May/June 2016

19 A student suggests some uses for containers made from good thermal conductors and for containers made from poor thermal conductors. In which row are both suggested uses correct? good thermal conductor poor thermal conductor A keeping a cold liquid at transferring thermal energy a low temperature quickly from a hot liquid B keeping a hot liquid at keeping a cold liquid at a high temperature a low temperature C transferring thermal energy transferring thermal energy quickly from a hot liquid quickly to a cold liquid D transferring thermal energy keeping a hot liquid at quickly to a cold liquid a high temperature

1 marks

Answer: D

This question in 0625/13 May/June 2016

20 A rod is made half of glass and half of copper. Four pins A, B, C and D are attached to the rod by wax. The rod is heated in the centre as shown. The pins fall off when the wax melts. Which pin falls off first? glass copper pin pin pin pin A B C D heat

1 marks

Answer: C

This question in 0625/13 May/June 2016

18 Which statement about infra-red radiation is correct? A A black surface is a poor absorber of infra-red radiation. B A dull surface is a better emitter of infra-red radiation than a shiny surface. C A shiny surface is a better absorber of infra-red radiation than a dull surface. D A white surface is a poor reflector of infra-red radiation.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2016

19 A pan is made for heating water on a stove. handle pan From which type of materials should the pan and its handle be made? material for pan material for handle A good thermal conductor good thermal conductor B good thermal conductor poor thermal conductor C poor thermal conductor good thermal conductor D poor thermal conductor poor thermal conductor

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2016

18 Aluminium foil is attached to the walls of a warm room in a cold country. This reduces the rate of thermal energy loss from inside the warm room. Which method or methods of thermal energy transfer are reduced by the foil? A conduction and convection only B conduction only C convection and radiation only D radiation only

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2016

19 On a very cold day, a boy puts one hand on the metal handlebars of his bicycle. He puts the other hand on the rubber hand grip. The metal feels colder than the rubber hand grip, although they are both at the same temperature. Why is this? A The metal has a higher melting point than the rubber. B The metal has a lower thermal capacity than the rubber. C The metal is a better thermal conductor than the rubber. D The metal radiates more infra-red radiation than the rubber.

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2016

19 The diagram shows the temperature-time graph for hot water that is cooling in an uninsulated beaker. 80 temperature / °C 60 40 20 0 0 1 2 3 time / hours The beaker is now insulated. The same volume of hot water, at the same initial temperature as before, is put into the insulated beaker. The beaker is in the same room as before. Which is the new temperature-time graph for the water as it cools? A B 80 80 temperature temperature / °C 60 / °C 60 40 40 20 20 0 0 0 1 2 3 0 1 2 3 time / hours time / hours C D 80 80 temperature temperature / °C 60 / °C 60 40 40 20 20 0 0 0 1 2 3 0 1 2 3 time / hours time / hours

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2016

18 The diagram shows the gap between a hot surface and a cold surface. The gap can contain air, solid iron, a vacuum or liquid water. cold gap hot Which row shows whether heat can be transferred between the surfaces by conduction and convection? conduction convection A air (gas) yes no B iron (solid) yes no C vacuum no yes D water (liquid) yes no

1 marks

Answer: B

This question in 0625/12 Feb/March 2017

19 Ice is trapped by a piece of wire gauze at the bottom of a tube containing water. The water at the top of the tube boils before the ice at the bottom of the tube melts. water wire gauze gentle heating ice Why does this happen? A Convection currents are circulating throughout the water. B Ice is a poor emitter of thermal energy. C Water is a poor conductor of thermal energy. D Wire gauze is a good conductor of thermal energy.

1 marks

Answer: C

This question in 0625/12 Feb/March 2017

24 What is the main type of radiation given out by a campfire? A infra-red B microwave C ultraviolet D X-ray

1 marks

Answer: A

This question in 0625/12 Feb/March 2017

18 A copper bar and a wooden bar are joined. A piece of paper is wrapped tightly around the join. The bar is heated strongly at the centre for a short time, and the paper goes brown on one side only. wood paper copper heat Which side goes brown, and what does this show about wood and copper? brown side wood copper A copper conductor insulator B copper insulator conductor C wood conductor insulator D wood insulator conductor

1 marks

Answer: D

This question in 0625/11 May/June 2017

19 Four identical metal plates are painted either black or white and have either a dull or a shiny surface. They are heated to the same temperature. Which plate radiates thermal energy at the greatest rate? A the plate that is dull and black B the plate that is dull and white C the plate that is shiny and black D the plate that is shiny and white

1 marks

Answer: A

This question in 0625/11 May/June 2017

17 A copper bar and a wooden bar are joined. A piece of paper is wrapped tightly around the join. The bar is heated strongly at the centre for a short time, and the paper goes brown on one side only. wood paper copper heat Which side goes brown, and what does this show about wood and copper? brown side wood copper A copper conductor insulator B copper insulator conductor C wood conductor insulator D wood insulator conductor

1 marks

Answer: D

This question in 0625/12 May/June 2017

19 A hollow aluminium cube is filled with very hot water. Side X of the cube is opposite side Y of the cube. One of these two sides is black and one is white. A student holds the back of one hand 5 cm from side X, and then immediately holds the back of the other hand 5 cm from side Y. aluminium cube side X side Y 5 cm 5 cm very hot water The hand held near side Y feels warmer than the hand held near side X. Which row identifies the black side and correctly compares the rate of emission of thermal radiation from each side? rate of emission black side of thermal radiation A X greater for X B X the same for X and Y C Y greater for Y D Y the same for X and Y

1 marks

Answer: C

This question in 0625/12 May/June 2017

18 A copper bar and a wooden bar are joined. A piece of paper is wrapped tightly around the join. The bar is heated strongly at the centre for a short time, and the paper goes brown on one side only. wood paper copper heat Which side goes brown, and what does this show about wood and copper? brown side wood copper A copper conductor insulator B copper insulator conductor C wood conductor insulator D wood insulator conductor

1 marks

Answer: D

This question in 0625/13 May/June 2017

19 Which types of thermal energy transfer require a medium? A conduction and convection B conduction only C convection and radiation D radiation only

1 marks

Answer: A

This question in 0625/13 May/June 2017

18 The air temperature in a cold room is 15 °C. A heater that contains water at 50 °C is used to heat the room. By which process is most of the thermal energy transferred throughout the air in the room? A conduction B convection C evaporation D radiation

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2017

19 Which statement about convection currents is correct? A Convection currents occur because, when cooled, liquids contract and become more dense. B Convection currents occur because, when warmed, liquids expand and become more dense. C Convection currents only occur in liquids. D Convection currents only occur in solids and liquids.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2017

19 Three cups are made from the same insulating material. cup 1 cup 2 cup 3 The cups are each filled with the same volume of hot tea. In which cup does the tea cool most quickly and in which cup does it cool most slowly? most quickly most slowly A 1 3 B 2 1 C 3 2 D 3 1

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2017

20 Why does a balloon filled with hot air rise? A Cold air is less dense than hot air. B Cold air is more dense than hot air. C Heat rises. D The density of the balloon is greater than the density of the surrounding gas.

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2017

18 Why is the heating coil of a domestic immersion heater placed at the bottom of the tank? A Cold water is less dense than hot water and therefore sinks. B Cold water is more dense than hot water and therefore rises. C Hot water is less dense than cold water and therefore rises. D Hot water is more dense than cold water and therefore sinks.

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2017

24 Which types of thermal energy transfer are due to electromagnetic waves? A conduction and convection B convection and radiation C convection only D radiation only

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2017

20 On a cold day, a metal front-door knob X and a similar plastic knob Y are at the same temperature. Why does X feel cooler to the touch than Y? A X convects thermal energy better than Y. B X is a better thermal conductor than Y. C X is a better insulator than Y. D X is a better radiator of thermal energy than Y.

1 marks

Answer: B

This question in 0625/11 May/June 2018

21 A liquid is heated and it expands. How does this lead to the formation of a convection current? A The density of the heated liquid decreases. B The density of the heated liquid increases. C The mass of the heated liquid molecules decreases. D The mass of the heated liquid molecules increases.

1 marks

Answer: A

This question in 0625/11 May/June 2018

18 Four thermometers, with their bulbs painted different colours, are placed at equal distances from a radiant heater. Which thermometer shows the slowest temperature rise when the heater is first switched on? A matt black B matt white C shiny black D shiny white

1 marks

Answer: D

This question in 0625/12 May/June 2018

17 The diagram shows a pan used for cooking food. handle of pan base of pan Which row is correct for the materials used to make the base and the handle of the pan? base of pan handle of pan A good thermal conductor good thermal conductor B good thermal conductor poor thermal conductor C poor thermal conductor good thermal conductor D poor thermal conductor poor thermal conductor

1 marks

Answer: B

This question in 0625/13 May/June 2018

18 A saucepan of water is heated from its base on an electric hob. After five minutes the water near the top of the saucepan is becoming hot. What is the main process of heat transfer within the water? A condensation B conduction C convection D radiation

1 marks

Answer: C

This question in 0625/13 May/June 2018

19 On a cold day, a shiny metal rod feels colder to the touch than a black plastic rod. Which statement explains this observation? A The metal rod is a better absorber of infra-red radiation than the plastic rod. B The metal rod is a better thermal conductor than the plastic rod. C The metal rod is a worse absorber of infra-red radiation than the plastic rod. D The metal rod is a worse thermal conductor than the plastic rod.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2018

19 Which statement about convection is not correct? A It enables water in a pan on a cooker to get evenly heated. B It happens in liquids and gases. C It means that heat rises. D It occurs because the density of a fluid decreases when it is heated.

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2018

19 One end of a shiny metal rod is heated and the other end quickly gets hot. Which statement describes why the other end quickly gets hot? A Metals are good thermal conductors. B Metals are poor thermal conductors. C Shiny surfaces are good emitters of infra-red radiation. D Shiny surfaces are poor emitters of infra-red radiation.

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2018

18 Four campers are warming their food on a fire. They use different rods, each of the same dimensions, to hold their food near the fire. rod food fire Which material is the best choice to prevent their hands from getting too hot? A aluminium B copper C steel D wood

1 marks

Answer: D

This question in 0625/12 Feb/March 2019

19 A beaker of water is heated and thermal energy travels through the water by convection. What happens to the density of the water when it is heated and how does the water move? A The density decreases and the heated water moves downwards. B The density decreases and the heated water moves upwards. C The density increases and the heated water moves downwards. D The density increases and the heated water moves upwards.

1 marks

Answer: B

This question in 0625/12 Feb/March 2019

19 In which does thermal conduction not occur? A a gas B a liquid C a solid D a vacuum

1 marks

Answer: D

This question in 0625/11 May/June 2019

20 The metal surface of a kettle is hot. What happens to the cool air outside the kettle when it comes into contact with the hot kettle? A The density of the air decreases and the air falls. B The density of the air decreases and the air rises. C The density of the air increases and the air falls. D The density of the air increases and the air rises.

1 marks

Answer: B

This question in 0625/11 May/June 2019

19 The metal surface of a kettle is hot. What happens to the cool air outside the kettle when it comes into contact with the hot kettle? A The density of the air decreases and the air falls. B The density of the air decreases and the air rises. C The density of the air increases and the air falls. D The density of the air increases and the air rises.

1 marks

Answer: B

This question in 0625/12 May/June 2019

20 Vacuum flasks usually have silvered walls that help to keep the contents of the flask hot. Why are the walls silvered? A to absorb thermal energy from the air around the flask B to increase the rate of convection inside the flask C to reduce energy loss to the surroundings by conduction D to reflect thermal radiation back into the flask

1 marks

Answer: D

This question in 0625/12 May/June 2019

19 A person holds an empty glass beaker and pours hot water into it. Why does it take a few seconds before his hand starts to feel hot? A Glass is a poor conductor of heat. B Water is a poor conductor of heat. C Glass is a better conductor of heat than water. D Water is a better conductor of heat than glass.

1 marks

Answer: A

This question in 0625/13 May/June 2019

20 The metal surface of a kettle is hot. What happens to the cool air outside the kettle when it comes into contact with the hot kettle? A The density of the air decreases and the air falls. B The density of the air decreases and the air rises. C The density of the air increases and the air falls. D The density of the air increases and the air rises.

1 marks

Answer: B

This question in 0625/13 May/June 2019

19 A glass test-tube containing water is heated at the top. The water at the top boils, but the water at the bottom remains cold. water test-tube heat Which row explains why the water at the bottom of the test-tube remains cold? glass water A good thermal conductor good thermal conductor B good thermal conductor poor thermal conductor C poor thermal conductor good thermal conductor D poor thermal conductor poor thermal conductor

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2019

20 In countries where it is usually hot, houses are often painted white. What is the reason for this? A White surfaces are good reflectors of radiant energy. B White surfaces are good transmitters of radiant energy. C White surfaces are good absorbers of radiant energy. D White surfaces are good emitters of radiant energy.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2019

19 Which method of thermal transfer occurs when the density of some of a liquid decreases and the liquid moves upwards? A conduction B convection C evaporation D radiation

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2019

20 The diagram shows a tent made from a new material. new material What type of material should the tent be made of to reflect the radiant energy from the Sun? material material texture surface colour A dull black B dull white C shiny black D shiny white

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2019

19 A beaker contains some cold water. A purple crystal is placed on the bottom of the beaker. The beaker is gently heated beneath the crystal. The crystal dissolves in the water. The colour spreads, as shown in the diagram. gentle heat Three students each make a statement about the experiment. Student 1 says the purple water is less dense than the rest of the water. Student 2 says the purple water is warmer than the rest of the water. Student 3 says all of the water will eventually get heated, even though water is a poor conductor of thermal energy. Which students are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2019

20 Why are the outside walls of houses often painted white in very hot countries? A White surfaces are good absorbers of infrared radiation. B White surfaces are good emitters of infrared radiation. C White surfaces are poor absorbers of infrared radiation. D White surfaces are poor reflectors of infrared radiation.

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2019

19 One ice cube is placed on a metal block. An identical ice cube is placed on a plastic block. The blocks are left next to each other on a table in a laboratory. ice cube metal block plastic block Which ice cube melts first and why? A The ice cube on the plastic block melts first because plastic is a good insulator of thermal energy. B The ice cube on the plastic block melts first because plastic is a good conductor of thermal energy. C The ice cube on the metal block melts first because metal is a good conductor of thermal energy. D The ice cube on the metal block melts first because metal is a good insulator of thermal energy.

1 marks

Answer: C

This question in 0625/11 May/June 2020

20 Two freezers X and Y are identical except that one has a door opening at the front and the other has a door opening at the top. door freezer freezer door X Y Both doors are the same size and are opened for the same amount of time. Which freezer gains the least amount of thermal energy in this time and why? freezer gaining the reason least thermal energy A X cold air falls B X warm air falls C Y cold air falls D Y warm air falls

1 marks

Answer: C

This question in 0625/11 May/June 2020

17 A metal block is left overnight in a cool, shady room. In the morning, the metal block is moved into warm surroundings. Which statement about the metal block is correct in the morning? A The internal energy of the metal block increases. B The temperature of the metal block decreases. C Convection transfers energy throughout the metal block. D The metal contracts slightly.

1 marks

Answer: A

This question in 0625/12 May/June 2020

19 A room is heated by a radiator. The diagrams X and Y show two possible circulations of hot air, which heat the room. diagram X ceiling diagram Y ceiling radiator radiator floor floor Which diagram and reason explain the heating of the room by convection? diagram reason A X air density decreases when air is heated B X air density increases when air is heated C Y air density decreases when air is heated D Y air density increases when air is heated

1 marks

Answer: A

This question in 0625/12 May/June 2020

20 Two similar liquid-in-glass thermometers P and Q are placed in direct sunlight. The bulb of thermometer P is painted white. The bulb of thermometer Q is painted black. How and why would the thermometer readings differ? A P would read higher than Q because black is a good absorber of radiation. B P would read higher than Q because black is a poor absorber of radiation. C P would read lower than Q because black is a good absorber of radiation. D P would read lower than Q because black is a poor absorber of radiation.

1 marks

Answer: C

This question in 0625/12 May/June 2020

19 The diagram shows a vacuum flask used to keep a liquid warm. airtight lid outer cover vacuum silvered walls Which methods of heat loss are reduced by the vacuum between the silvered walls? A conduction only B conduction and convection only C convection and radiation only D conduction, convection and radiation

1 marks

Answer: B

This question in 0625/13 May/June 2020

20 Equal volumes of water at 100 °C are put in four containers. Two containers have matt black sides and two containers have shiny white sides. One of each type of container has a lid. The containers are left for two minutes. Which container has the highest temperature? A B C D lid lid matt black sides matt black sides shiny white sides shiny white sides

1 marks

Answer: D

This question in 0625/13 May/June 2020

10 The arrows show an outline of the processes in an oil-fired power station. oil is burnt  turns turbine  turns generator  output transformer What are the processes for the transfer of energy between the turbine and the generator and between the generator and the output transformer? turbine to generator generator to output transformer A electrical working electrical working B mechanical working electrical working C mechanical working transfer of thermal energy D transfer of thermal energy mechanical working

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2020

18 The diagram shows four rods. Each rod is made of a different metal. P Q brass copper X silver iron S R Wax is used to attach small metal balls at the rod ends P, Q, R and S. Each rod is the same size. They are heated uniformly by a Bunsen burner at point X. As the rods warm up, the wax melts and the balls fall off. Why does the ball on the silver rod fall first? A Silver is the best conductor of heat. B Silver is the worst conductor of heat. C Silver is the best radiator of heat. D Silver is the worst radiator of heat.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2020

19 The diagram shows a pan of water being heated. After a short time, all the water in the pan begins to boil. heat What is the main process by which thermal energy is transferred through the water? A conduction B convection C evaporation D radiation

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2020

18 Thermal energy is supplied at the same rate to four bars made from different materials. thermal X Y energy After several minutes, there is a temperature difference between X and Y for each bar. Which statement identifies the bar with the greatest temperature difference between points X and Y, and gives the correct reason? A copper because it is a good conductor of thermal energy B lead because it is the densest metal C plastic because it is a poor conductor of thermal energy D wood because it is a good conductor of thermal energy

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2020

19 A scientist measures the air temperature at different heights from the floor in a cave. The results are recorded in the table. height / m temperature / C 0 10 10 11 20 13 30 14 40 16 Why does altering the height affect the temperature of the air? A The molecules in warm air have less energy than the molecules in cool air. B The molecules in cool air are further apart than the molecules in warm air. C Warm air is less dense than cool air. D Cool air rises above warm air.

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2020

18 The diagram shows the view of a room heated by a radiator. The arrowed line from X to Y is the path of the convection current in the air. ceiling X Y radiator floor Which row about the air temperature and the air density at X and at Y is correct? air temperature air density A higher at X higher at X B higher at X higher at Y C higher at Y higher at Y D higher at Y higher at X

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2020

19 Which thermal process can transfer energy through a vacuum? A conduction B convection C evaporation D radiation

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2020

17 Four samples of materials with the same dimensions are tested. Which material gives the highest rate of thermal conduction? A rubber B copper C plastic D steel

1 marks

Answer: B

This question in 0625/12 Feb/March 2021

20 Four metal mugs with lids each contain the same volume of hot water at the same temperature. The mugs are made from the same metal and are the same shape and size, but each has its outside surface painted with a different combination of texture and colour. Which mug radiates thermal energy at the fastest rate? A the mug painted shiny white B the mug painted dull white C the mug painted shiny black D the mug painted dull black

1 marks

Answer: D

This question in 0625/12 Feb/March 2021

25 Thermal radiation is part of the electromagnetic spectrum. What is the name of this region of the spectrum? A gamma rays B infrared rays C ultraviolet rays D visible light rays

1 marks

Answer: B

This question in 0625/12 Feb/March 2021

19 The table gives some examples of convection and an explanation of why the convection occurs. Which row is correct? example explanation A air conditioner unit The unit is placed in a high position to circulate the cold air rising from the floor level and so keeping the room cold. B convection oven The air in the oven becomes more dense when heated so it falls to the bottom heating the food faster. C hot-air balloon Air inside the balloon becomes less dense which causes the balloon to rise. D land and sea breezes A breeze forms due to the warm air above the land moving down towards the sea.

1 marks

Answer: C

This question in 0625/12 May/June 2021

20 In which situation is radiation the main method by which energy is transferred? A heating a pan of water using a gas camping stove B energy reaching the Earth from the Sun C heating the air in a room with a radiator D giving gravitational potential energy to a glider when it is lifted by thermal currents

1 marks

Answer: B

This question in 0625/12 May/June 2021

16 The diagram shows a pan used for cooking food. handle of pan base of pan Which row is correct for the materials used to make the base and the handle of the pan? base of pan handle of pan A good thermal conductor good thermal conductor B good thermal conductor poor thermal conductor C poor thermal conductor good thermal conductor D poor thermal conductor poor thermal conductor

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2021

29 The step-down transformer shown reduces mains voltage to 12 V. copper wire soft-iron core mains 12 V voltage When the transformer is used, some energy is transferred to the surroundings. Which type of energy is transferred to the surroundings? A chemical energy B light energy C thermal energy D elastic energy

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2021

16 The diagram shows a pan used for cooking food. handle of pan base of pan Which row is correct for the materials used to make the base and the handle of the pan? base of pan handle of pan A good thermal conductor good thermal conductor B good thermal conductor poor thermal conductor C poor thermal conductor good thermal conductor D poor thermal conductor poor thermal conductor

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2021

16 The diagram shows a pan used for cooking food. handle of pan base of pan Which row is correct for the materials used to make the base and the handle of the pan? base of pan handle of pan A good thermal conductor good thermal conductor B good thermal conductor poor thermal conductor C poor thermal conductor good thermal conductor D poor thermal conductor poor thermal conductor

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2021

19 Astudent sets up an experiment to find out how well different metals conduct thermal energy. One end of a rod of each metal is in hot water and the other end has a small nail attached to it by wax. The rods have the same thickness. hot water nail wax Which conditions should be satisfied in order to make this a valid test? hot water kept same same size nails at constant length rods temperature g A Jv Jv Jv B Jv v x Cc v x Jv D x v Jv key / = condition applies X = condition does not apply

1 marks

Answer: C

This question in 0625/12 Feb/March 2022

20 Two similar metal containers, P and Q, each contain water at 90 C. Both containers are the same size and both are sealed. The water in container P cools more quickly than the water in container Q. Which statement is correct? A P contains more water than Q. B P has a shinier surface than Q. C P is painted a darker colour than Q. D P is surrounded by a vacuum and Q is surrounded by air.

1 marks

Answer: C

This question in 0625/12 Feb/March 2022

14 Two thermometers, P and Q, give the same reading at room temperature. The bulb of thermometer Q is wrapped in gauze and dipped in a beaker of water at room temperature. Air at room temperature is blown over the two thermometer bulbs. Which statement correctly describes and explains what happens? A P reads higher than Q because bulb P absorbs energy from the air. B P reads higher than Q because water evaporates from the gauze and cools bulb Q. C P reads lower than Q because the wet gauze insulates bulb Q. D P reads lower than Q because water evaporates from the gauze and warms bulb Q.

1 marks

Answer: B

This question in 0625/11 May/June 2022

17 A glass contains an iced drink on a warm and humid day. Water starts to form on the outside of the glass. What is the name of the effect by which the water forms? A condensation B conduction C convection D evaporation

1 marks

Answer: A

This question in 0625/11 May/June 2022

18 The diagram shows a convection current caused by a piece of ice placed in a beaker of water at room temperature. ice Q P Which row correctly compares the temperatures and densities at water points P and Q? temperature at P density at P A higher than at Q higher than at Q B higher than at Q lower than at Q C lower than at Q higher than at Q D lower than at Q lower than at Q

1 marks

Answer: C

This question in 0625/11 May/June 2022

19 The outside of one of two identical shiny metal containers is painted dull black. The containers are filled with equal masses of hot water at the same temperature. Why does the dull black container cool more quickly? A Black surfaces are better conductors than shiny surfaces. B Black surfaces are better emitters of radiation than shiny surfaces. C Black surfaces are better reflectors of radiation than shiny surfaces. D Black surfaces are worse absorbers of radiation than shiny surfaces.

1 marks

Answer: B

This question in 0625/11 May/June 2022

18 The diagram shows solar water panels on the roof of a house. The panels absorb energy from the Sun to heat up the water in the metal pipes. metal pipes Which row describes how energy is transferred from the Sun and through the metal of the pipes? through the from the Sun metal of the pipes A conduction conduction B conduction convection C radiation conduction D radiation convection

1 marks

Answer: C

This question in 0625/12 May/June 2022

19 Four beakers containing equal volumes of water at 10 C are placed outside in full sunshine on a hot day. The four beakers are identical except for their surface colour and texture. Which beaker will heat up the quickest? A B C D dull black shiny black dull white shiny white

1 marks

Answer: A

This question in 0625/12 May/June 2022

17 A glass contains an iced drink on a warm and humid day. Water starts to form on the outside of the glass. What is the name of the effect by which the water forms? A condensation B conduction C convection D evaporation

1 marks

Answer: A

This question in 0625/13 May/June 2022

18 In which situation is the main transfer of thermal energy by convection? A B food cooked under a grill a cold drink stored in a vacuum flask stopper grill air cold drink food vacuum transfer from grill to food transfer from air to drink C D food cooled in a freezer cool water in a tank freezing compartment metal tank Sun air food water transfer from food transfer from the Sun to water to freezing compartment

1 marks

Answer: C

This question in 0625/13 May/June 2022

19 A metal container is the shape of a hollow cube. The four sides of the container have different surface finishes. Which side is the best emitter of radiation? D A dull black shiny black C B dull white shiny white

1 marks

Answer: D

This question in 0625/13 May/June 2022

17 Particles can move, transferring thermal energy, as shown. heater In which states of matter does this movement occur? A gas and liquid only B gas and solid only C gas, liquid and solid D liquid and solid only

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2022

17 How is energy transferred from the Sun to the Earth? A by -particles B by conduction C by convection D by radiation

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2022

17 In which states of matter can thermal energy be transferred by convection? A in gases, liquids and solids B in gases and liquids only C in gases and solids only D in liquids only

1 marks

Answer: B

This question in 0625/12 Feb/March 2023

16 Which surface is the worst absorber of infrared radiation? A dull black B dull white C shiny black D shiny white

1 marks

Answer: D

This question in 0625/11 May/June 2023

16 A teacher puts some cold water in a test-tube. She holds the bottom of the test-tube while heating the top. boiling water cold water heat The water at the top boils but she continues to hold the test-tube as the bottom remains cold. Which conclusion about water is made from this experiment? A Water is a bad conductor. B Water is a bad convector. C Water is a good conductor. D Water is a good convector.

1 marks

Answer: A

This question in 0625/12 May/June 2023

16 The diagram shows a flask designed to reduce the loss of thermal energy from a hot liquid. plastic stopper vacuum thin silvered walls of glass hot liquid plastic supports Which methods of thermal energy transfer are the silvered walls designed to reduce? A conduction, convection and radiation B conduction and convection only C conduction only D radiation only

1 marks

Answer: D

This question in 0625/13 May/June 2023

16 The diagram shows the view of a room heated by a radiator. The arrowed line from X to Y is the path of the convection current in the air. ceiling X Y radiator floor Which row about the air temperature and the air density at X and at Y is correct? air temperature air density A higher at X higher at X B higher at X higher at Y C higher at Y higher at Y D higher at Y higher at X

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2023

16 A room is heated by a radiator. The diagrams X and Y show two possible circulations of hot air, which heat the room. diagram X ceiling diagram Y ceiling radiator radiator floor floor Which diagram and reason explain the heating of the room by convection? diagram reason A X air density decreases when air is heated B X air density increases when air is heated C Y air density decreases when air is heated D Y air density increases when air is heated

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2023

16 A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. wall cupboard heater air moves through gap floor Which row describes the temperature and the direction of movement of the air in the gap? air temperature air direction A cool away from the heater B cool towards the heater C warm away from the heater D warm towards the heater

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2023

14 Which of the following is not an example of convection? A a spoon handle becoming hot when it is placed in a hot drink B a thermal up-draught in the atmosphere that glider pilots use C flames and smoke rising from a fire D warming up water in a kettle on a gas ring

1 marks

Answer: A

This question in 0625/12 Feb/March 2024

15 A hollow aluminium cube is filled with very hot water. Side X of the cube is opposite side Y of the cube. One of these two sides is black and one is white. A student holds the back of one hand 5 cm from side X, and then immediately holds the back of the other hand 5 cm from side Y. aluminium cube side X side Y 5 cm 5 cm very hot water The hand held near side Y feels warmer than the hand held near side X. Which row identifies the black side and correctly compares the rate of emission of thermal radiation from each side? rate of emission black side of thermal radiation A X greater for X B X the same for X and Y C Y greater for Y D Y the same for X and Y

1 marks

Answer: C

This question in 0625/12 Feb/March 2024

15 In which situation is radiation the main method by which energy is transferred? A heating a pan of water using a gas camping stove B energy reaching the Earth from the Sun C heating the air in a room with a convection heater D giving gravitational potential energy to a glider when it is lifted by thermal currents

1 marks

Answer: B

This question in 0625/11 May/June 2024

14 A rod is made half of aluminium and half of glass. A pin is attached to each end of the rod by wax. The rod is heated at the centre. A pin falls off when the wax melts. aluminium glass wax wax pin P pin Q heat Which statement is correct? A Pin P falls off first because aluminium is a better thermal conductor than glass. B Pin P falls off first because aluminium is a worse thermal conductor than glass. C Pin Q falls off first because glass is a better thermal conductor than aluminium. D Pin Q falls off first because glass is a worse thermal conductor than aluminium.

1 marks

Answer: A

This question in 0625/13 May/June 2024

15 In countries where it is usually hot, houses are often painted white. What is the reason for this? A White surfaces are good reflectors of infrared radiation. B White surfaces are good conductors of infrared radiation. C White surfaces are good absorbers of infrared radiation. D White surfaces are good emitters of infrared radiation.

1 marks

Answer: A

This question in 0625/13 May/June 2024

16 A beaker of water is heated and thermal energy travels through the water by convection. What happens to the density of the water when it is heated and how does the water move? A The density decreases and the heated water moves downwards. B The density decreases and the heated water moves upwards. C The density increases and the heated water moves downwards. D The density increases and the heated water moves upwards.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2024

16 There is a vacuum between the double walls of a vacuum flask. Which types of thermal transfer are reduced by the vacuum? A conduction, convection and radiation B conduction and convection only C conduction and radiation only D convection and radiation only

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2024

16 The diagram shows a vacuum flask used to keep liquid hot. vacuum hot liquid How does thermal energy pass through the vacuum? A conduction and convection only B conduction only C convection only D radiation only

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2024

20 A candle is used to heat some water in a glass beaker. glass beaker water candle What is the main method of heat transfer through the glass and within the water? through the glass within the water A conduction conduction B conduction convection C convection conduction D convection convection

1 marks

Answer: B

This question in 0625/12 Feb/March 2025

16 Students test four rods of different materials, W, X, Y and Z, to compare how well the materials conduct thermal energy. The rods are all the same size and shape. The students use wax to stick a pin to one end of the first rod. The wax melts when it is warm. The other end of the rod is heated and the time taken for the pin to fall is recorded. The experiment is repeated for each rod. The students plot a chart of the time taken for each pin to fall. 90 80 time / s 70 60 50 40 30 20 10 0 material material material material W X Y Z Which statement is correct? A X is a better thermal conductor than Y. B Y is a better thermal conductor than W. C Z is a better thermal conductor than W. D Z is a better thermal conductor than X.

1 marks

Answer: A

This question in 0625/11 May/June 2025

17 A student has four metal containers filled with the same volume of water at a temperature of 80 °C. The metal containers are put in a room at a temperature of 20 °C. The metal containers are identical except for the texture and colour of their surfaces. Which surface will emit energy at the greatest rate? A dull black B shiny black C dull white D shiny white

1 marks

Answer: A

This question in 0625/11 May/June 2025

14 A person holds an empty glass beaker and pours hot water into it. Why does it take a few seconds before his hand starts to feel hot? A Glass is a poor thermal conductor. B Water is a poor thermal conductor. C Glass is a better thermal conductor than water. D Water is a better thermal conductor than glass.

1 marks

Answer: A

This question in 0625/12 May/June 2025

15 A liquid is heated and it expands. How does this lead to the formation of a convection current? A The density of the heated liquid decreases. B The density of the heated liquid increases. C The mass of the heated liquid particles decreases. D The mass of the heated liquid particles increases.

1 marks

Answer: A

This question in 0625/12 May/June 2025

16 Some electric hotplates are metal and do not glow when hot. Other hotplates are glass and have a heater underneath that glows red. The heater makes the glass hot. With both hotplates, there is no air gap between the hotplate and a metal pan placed on the hotplate. Which statement is correct? A The glass hotplate transfers less energy by radiation to the base of the pan than the metal hotplate. B The glass hotplate transfers energy by convection to the base of the pan. C The metal hotplate transfers energy by conduction to the base of the pan. D The metal hotplate transfers energy by convection to the base of the pan.

1 marks

Answer: C

This question in 0625/12 May/June 2025

14 A person holds an empty glass beaker and pours hot water into it. Why does it take a few seconds before his hand starts to feel hot? A Glass is a poor thermal conductor. B Water is a poor thermal conductor. C Glass is a better thermal conductor than water. D Water is a better thermal conductor than glass.

1 marks

Answer: A

This question in 0625/13 May/June 2025

15 A liquid is heated and it expands. How does this lead to the formation of a convection current? A The density of the heated liquid decreases. B The density of the heated liquid increases. C The mass of the heated liquid particles decreases. D The mass of the heated liquid particles increases.

1 marks

Answer: A

This question in 0625/13 May/June 2025

16 Some electric hotplates are metal and do not glow when hot. Other hotplates are glass and have a heater underneath that glows red. The heater makes the glass hot. With both hotplates, there is no air gap between the hotplate and a metal pan placed on the hotplate. Which statement is correct? A The glass hotplate transfers less energy by radiation to the base of the pan than the metal hotplate. B The glass hotplate transfers energy by convection to the base of the pan. C The metal hotplate transfers energy by conduction to the base of the pan. D The metal hotplate transfers energy by convection to the base of the pan.

1 marks

Answer: C

This question in 0625/13 May/June 2025

15 Rods of the same shape and size are inserted through corks into an empty tank. Each rod is covered with a layer of solid wax that has a low melting point. Hot water is added to the tank, as shown. After a period of time, some wax melts. tank hot water good thermal conductor cork bad thermal moderate thermal conductor conductor On which of the rods will the wax melt first? A all at the same time B good thermal conductor C bad thermal conductor D moderate thermal conductor

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2025

16 Which method of thermal transfer occurs when the density of some of a liquid decreases and the liquid moves upwards? A conduction B convection C evaporation D radiation

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2025

17 Which surface is the best reflector of infrared radiation? A dull and black B dull and white C shiny and black D shiny and white

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2025

16 The diagram shows a hot-water tank. The tank has a heater, X, halfway up the tank. hot water out heater X cold water in Heater X is switched on. Which row states the main processes by which thermal energy is transferred to the water above the heater and to the water below the heater? thermal energy transfer to thermal energy transfer to the water above the heater the water below the heater A conduction conduction B conduction convection C convection conduction D convection convection

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2025

17 The handle of a metal cooking pan is made from wood. What is a reason for making the handle from wood? A to increase thermal energy transfer by conduction B to increase thermal energy transfer by convection C to reduce thermal energy transfer by conduction D to reduce thermal energy transfer by convection

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2025