Energy, work and power — Paper 1 · IGCSE Physics (9-1) 0972

10 The diagram shows the energy transferred in a lamp in one second. light energy out total energy in = 60 J = 100 J wasted energy out = 40 J Which type of wasted energy is produced by the lamp? A chemical potential energy B electrical energy C gravitational potential energy D thermal energy

1 marks

Answer: D

This question in 0972/11 May/June 2018

11 Which energy resource is not renewable? A fossil fuel B sunlight C tides D wind

1 marks

Answer: A

This question in 0972/11 May/June 2018

12 A student does work by pulling a box across a horizontal floor. She now pulls a second box along the same floor. Which row indicates that the student is now doing twice as much work? force used distance the to pull box box is pulled A is doubled is doubled B is doubled is halved C stays the same is doubled D stays the same is halved

1 marks

Answer: C

This question in 0972/11 May/June 2018

10 A machine is very efficient. What does this mean? A It produces a large amount of power. B It uses very little energy. C It wastes very little energy. D It works very quickly.

1 marks

Answer: C

This question in 0972/11 May/June 2019

11 An object is lifted vertically by a motor. In which example is the power produced the greatest? A lifting it a shorter distance in a longer time B lifting it the same distance in a longer time C lifting it a shorter distance in the same time D lifting it the same distance in a shorter time

1 marks

Answer: D

This question in 0972/11 May/June 2019

17 A night storage heater contains a large block of material that is heated electrically during the night. During the day the block cools down, releasing thermal energy into the room. Which thermal capacity and which night-time temperature increase will cause the most energy to be stored by the block? thermal capacity night-time of block temperature increase A large large B large small C small large D small small

1 marks

Answer: A

This question in 0972/11 May/June 2019

9 Brakes are used to slow down a moving car. Into which form of energy is most of the kinetic energy converted as the car slows down? A chemical B elastic C thermal D sound

1 marks

Answer: C

This question in 0972/11 Oct/Nov 2019

10 Which does not transfer useful energy? A emitting a sound wave B measuring a temperature C passing an electric current D pushing a box along the floor

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2019

11 The power output from solar panels is recorded every day for a month. The graph shows the output recorded. power output 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 day of the month Which conclusion can be drawn from this graph? A The power output from the solar panels changes from day to day. B The power output from the solar panels is cheap to produce. C Solar panels create no pollution. D Solar energy is renewable.

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2019

9 The diagram shows part of a rollercoaster ride with the car at different positions. The car runs freely down from position X to position Y and up the hill on the other side. car X Y What happens to the kinetic energy and to the gravitational potential energy of the car as it moves from position X to position Y? gravitational kinetic energy potential energy A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: C

This question in 0972/11 May/June 2020

10 Student P uses a force of 35 N to push a box 3.0 m across the floor. Student Q uses a force of 22 N to push another box 1.8 m across the floor. Which statement gives a full explanation why student P uses more energy than student Q? A Student P pushes his box a greater distance than student Q. B Student P pushes his box a greater distance and uses a bigger force than student Q. C Student P uses a bigger force than student Q. D Student P pushes a heavier box than student Q.

1 marks

Answer: B

This question in 0972/11 May/June 2020

11 A man can either take an escalator or a lift to travel up between two floors in a hotel. escalator lift The escalator takes 20 seconds to carry the man between the two floors. The useful work done against gravity is W. The useful power developed is P. The lift takes 30 seconds to carry the same man between the same two floors. How much useful work against gravity is done by the lift, and how much useful power is developed by the lift? useful work useful power done against developed by lift gravity by lift A more than W less than P B more than W P C W less than P D W P

1 marks

Answer: C

This question in 0972/11 May/June 2020

9 Which energy resource is not renewable? A geothermal B nuclear fission C solar D wind

1 marks

Answer: B

This question in 0972/12 May/June 2020

10 Two motors X and Y lift loads of the same weight through the same vertical distance. Motor X is more efficient than motor Y. Which statement about the motors is correct? A The useful energy output of motor X is larger than that of motor Y. B The useful energy output of motor X is smaller than that of motor Y. C The energy input of motor X is larger than that of motor Y. D The energy input of motor X is smaller than that of motor Y.

1 marks

Answer: D

This question in 0972/12 May/June 2020

11 A man can either take an escalator or a lift to travel up between two floors in a hotel. escalator lift The escalator takes 20 seconds to carry the man between the two floors. The useful work done against gravity is W. The useful power developed is P. The lift takes 30 seconds to carry the same man between the same two floors. How much useful work against gravity is done by the lift, and how much useful power is developed by the lift? useful work useful power done against developed by lift gravity by lift A more than W less than P B more than W P C W less than P D W P

1 marks

Answer: C

This question in 0972/12 May/June 2020

9 A man jumps from a stationary balloon. After falling several hundred metres, he opens his parachute. At which position is his kinetic energy greatest? A just after he jumps from the balloon B just before he opens his parachute C just after his parachute opens D just before he lands

1 marks

Answer: B

This question in 0972/11 Oct/Nov 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 0972/11 Oct/Nov 2020

11 To calculate the power produced by a force, the size of the force must be known. What else needs to be known to calculate the power? the distance that the force moves the object the time for which the force acts on the object 0 0O WwW D> v v x x v x v x key Jv = needed X = not needed

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2020

7 The graph shows the total energy transferred by an electric motor over a period of time. In which region of the graph is the greatest power being developed by the motor? D total energy C transferred B A 0 0 time

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2021

8 Electrical energy may be obtained from nuclear fission. In which order is the energy transferred in this process? A nuclear fuel  generator  reactor and boiler  turbines B nuclear fuel  generator  turbines  reactor and boiler C nuclear fuel  reactor and boiler  generator  turbines D nuclear fuel  reactor and boiler  turbines  generator

1 marks

Answer: D

This question in 0972/11 Oct/Nov 2021

9 The diagram shows an electric circuit. When the switch is closed, the lamp is lit. Which row states the type of energy stored in the cell and how this energy is usefully transferred to the lamp? type of energy how this energy is usefully stored in the cell transferred to the lamp A chemical by electric current B chemical by light C electrical by electric current D electrical by light

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2021

10 A scientist uses an electric motor to lift a load through a vertical distance of 2.0 m. He then increases the input power to the motor and repeats the experiment. The efficiency of the motor does not change. Which row correctly describes the effect that this has on the useful work done lifting the load and the time taken to lift it? work done time taken A decreases decreases B stays the same decreases C decreases stays the same D stays the same stays the same

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2021

9 A mass hangs vertically from a spring. The mass is raised to a point P and is then released. The mass oscillates repeatedly between point P and a lower point Q. Which energies alternately increase and decrease throughout the oscillations? A gravitational potential energy, kinetic energy and elastic energy B gravitational potential energy and kinetic energy only C gravitational potential energy, kinetic energy and internal energy D internal energy and elastic energy

1 marks

Answer: A

This question in 0972/11 May/June 2022

10 A force F acts on an object and the object moves a distance d in the direction of the force. What is the work done on the object? F d F  d 1 A B C D d F ( F  d )

1 marks

Answer: C

This question in 0972/11 May/June 2022

9 A tennis ball is dropped from position 1. It falls vertically onto a hard surface at position 2. tennis ball position 1 position 2 Which energy changes have taken place between position 1 and position 2? A gravitational potential  kinetic  chemical B gravitational potential  kinetic  elastic (strain) C kinetic  gravitational potential  chemical D kinetic  gravitational potential  elastic (strain)

1 marks

Answer: B

This question in 0972/12 May/June 2022

10 A force does work moving an object in the direction of the force. Which change in the force and distance always increases the work done? force distance A greater same B greater smaller C same smaller D smaller smaller

1 marks

Answer: A

This question in 0972/12 May/June 2022

16 An engineer investigates the increase in temperature of the oil in a car engine when it is first switched on. Which row is correct? change in explanation internal energy A increase The random kinetic energy of the particles increases. B increase The oil evaporates when it is heated. C decrease The potential energy of the particles increases. D decrease The oil changes state to a gas when it is heated.

1 marks

Answer: A

This question in 0972/12 May/June 2022

10 Which row about the change of energy in the energy store must be correct? change of process energy store energy in store A water pumped up to a gravitational potential increases high-altitude dam energy of water B water pumped up to a kinetic energy decreases high-altitude dam of water C air passes through gravitational potential increases a wind turbine energy of air D air passes through kinetic energy increases a wind turbine of air

1 marks

Answer: A

This question in 0972/11 May/June 2023

11 A rock of weight 50 N falls a vertical distance of 7.0 m from rest. What is the change in the gravitational potential energy store of the rock? A decrease of 7.1 J B decrease of 350 J C increase of 7.1 J D increase of 350 J

1 marks

Answer: B

This question in 0972/11 May/June 2023

12 A child runs up a set of stairs four times. The time taken for each run is recorded. Which time is measured when the child’s useful power is greatest? A 10 s B 20 s C 30 s D 40 s

1 marks

Answer: A

This question in 0972/11 May/June 2023

10 The diagram shows the energy stores for a mobile (cell) phone and how the energy is transferred between stores. internal heating energy chemical ? energy kinetic sound energy What describes how the chemical energy is transferred? A electrical work done B mechanical work done C electromagnetic waves D sound waves

1 marks

Answer: A

This question in 0972/12 May/June 2023

11 A moving object is brought to rest by a resistive force of 50 N over a distance of 5.0 m. What is the work done by the force? A 0.10 J B 10 J C 55 J D 250 J

1 marks

Answer: D

This question in 0972/12 May/June 2023

12 Which two physical quantities must be used to calculate the power developed by a student running up a flight of steps? A force exerted and the vertical height of the steps only B force exerted and the time taken only C work done and the vertical height of the steps only D work done and the time taken only

1 marks

Answer: D

This question in 0972/12 May/June 2023

8 A cyclist travels down a hill from rest at point X without pedalling. The cyclist applies his brakes and the cycle stops at point Y. X hill Y Which energy transfers have taken place between X and Y? A gravitational potential → kinetic → internal (thermal) B gravitational potential → internal (thermal) → kinetic C kinetic → gravitational potential → internal (thermal) D kinetic → internal (thermal) → gravitational potential

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2023

9 Which energy resource is non-renewable? A geothermal B natural gas C solar D wind

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2023

10 A pump does 460 000 J of work to raise water to fill a tank. It takes 7 minutes to fill the tank. What is the power of the pump? A 1.1 kW B 66 kW C 3200 kW D 190 000 kW

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2023

15 A student has two blocks of metal, X and Y. The temperature of X is 50°C and the temperature of Y is 0°C. The two blocks are placed in contact with each other, as shown. Y at 0°C After some time, both blocks have a temperature of 25°C. What has happened to the internal energy of each block? internal energy internal energy of X of Y decreased decreased decreased increased increased decreased unchanged unchanged

1 marks

Answer: B

This question in 0972/11 Oct/Nov 2023

6 A cyclist stops his bicycle using the brakes. Which row about energy stores is correct? decreases increases A kinetic energy store of bicycle chemical energy store of brakes B kinetic energy store of bicycle thermal energy store of brakes C thermal energy store of brakes kinetic energy store of bicycle D thermal energy store of brakes chemical energy store of bicycle

1 marks

Answer: B

This question in 0972/11 May/June 2024

7 A man applies a force of 40 N to push a box along the floor. 40 N 4.0 m How much power is required to push the box 4.0 m in 3.0 seconds? A 3.3 W B 30 W C 53 W D 480 W

1 marks

Answer: C

This question in 0972/11 May/June 2024

13 What increases when the temperature of a copper block increases? A the number of copper atoms in the block B the melting point of the block C the internal energy of the block D the density of the block

1 marks

Answer: C

This question in 0972/11 May/June 2024

7 A box of mass 2.0 kg and weight 20 N is carried to the top of some stairs. 1.2 m box 1.8 m How is the work done against gravity on the box calculated? A 2.0  1.8 B 20  1.2 C 2.0  1.2 D 20  1.2  1.8

1 marks

Answer: B

This question in 0972/12 May/June 2024

8 The diagram shows a steel sphere falling through a cylinder of oil. steel sphere oil Which row indicates what happens to the steel sphere and what happens to the oil as the steel sphere falls? the steel sphere the oil becomes becomes warmer warmer A yes yes B yes no C no yes D no no

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2024

9 A moving object is brought to rest by a frictional force of 30 N over a distance of 5.0 m. The diagram shows the energy transferred between stores. store of store of kinetic energy internal energy How much energy is transferred by this force and how is the energy transferred? how the energy energy transferred / J is transferred A 6.0 by electrical working B 6.0 by mechanical working C 150 by electrical working D 150 by mechanical working

1 marks

Answer: D

This question in 0972/11 Oct/Nov 2024

10 A motor transfers 24 J of energy in 60 seconds. What is the power output of the motor? A 0.40 W B 2.5 W C 24 W D 1400 W

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2024

27 A 60 W lamp operates at normal brightness for 2.0 minutes. How much energy is transferred by the lamp? A 0.50 J B 30 J C 120 J D 7200 J

1 marks

Answer: D

This question in 0972/11 Oct/Nov 2024

7 A mattress placed on a bed contains many compression springs. compression springs mattress bed Which energy store of the mattress increases when a person lies on the bed? A gravitational potential B chemical C elastic D kinetic

1 marks

Answer: C

This question in 0972/11 May/June 2025

8 Which energy resource does not contain a store of chemical energy? A biofuel B coal C nuclear fuel D oil

1 marks

Answer: C

This question in 0972/11 May/June 2025

9 A person carries 20 tiles from the ground to the roof of a house. Each tile has a mass of 1.2 kg. The roof of the house is 15 m above the ground. How much work does the person do against gravity on the tiles in carrying them to the roof? A 37 J B 180 J C 360 J D 3500 J

1 marks

Answer: D

This question in 0972/11 May/June 2025

27 The table gives data for four different electrical devices. Which device develops the greatest power? device voltage current A car headlight 12 V 3.0 A B cooling fan 110 V 0.40 A C electric spark generator 400 kV 0.10 mA D mains lamp 240 V 0.20 A

1 marks

Answer: D

This question in 0972/11 May/June 2025

8 The work done W by a force is related to the magnitude F of the force and the distance d moved in the direction of the force. Which equation for W is correct? A W = d  F B W = d + F C W = F  d D W = F  d

1 marks

Answer: D

This question in 0972/12 May/June 2025

9 Which energy resource requires a power station with a boiler to produce steam when generating electricity? A coal B tides C water behind a dam D wind

1 marks

Answer: A

This question in 0972/12 May/June 2025