Energy, work and power — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

31 The list contains three energy resources, P, Q and R. P geothermal energy from hot rocks Q nuclear fission in reactors R sunlight on solar panels Which of these resources are renewable? A P, Q and R B P and Q only C P and R only D Q and R only

1 marks

Answer: C

This question in 0654/21 May/June 2017

31 A body of mass m moving with speed v has kinetic energy E. v . A second body, also of mass m, moves with speed 2 What is the kinetic energy of the second body? E E A B C E D 2E 4 2

1 marks

Answer: A

This question in 0654/22 May/June 2017

32 A sample of a substance has a mass of 2.0 kg. The sample gains 40 000 J of energy and this causes its temperature to change from 10 °C to 50 °C. What is the specific heat capacity of the substance? A 400 J / (kg °C) B 500 J / (kg °C) C 800 J / (kg °C) D 1000 J / (kg °C)

1 marks

Answer: B

This question in 0654/23 May/June 2017

31 A worker carries bricks up a ladder. The following quantities are known. ● the height the bricks are lifted up ● the time taken for the worker to lift the bricks ● the volume of the bricks ● the weight of the bricks Which quantities are needed to calculate the useful power produced by the worker as he carries the bricks up the ladder? A height, time and volume B height, time and weight C height, volume and weight D time, volume and weight

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2017

38 The diagram shows a 3.0 Ω resistor connected to a 6.0 V battery. 6.0 V 3.0 Ω How much energy is transferred in the 3.0 Ω resistor in 30 seconds? A 15 J B 60 J C 360 J D 540 J

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2017

30 What is the definition of efficiency? energy input A × 100% useful energy output energy input B × 100% wasted energy useful energy output C × 100% energy input wasted energy D × 100% energy input

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2017

31 A worker carries bricks up a ladder. The following quantities are known. ● the height the bricks are lifted up ● the time taken for the worker to lift the bricks ● the volume of the bricks ● the weight of the bricks Which quantities are needed to calculate the useful power produced by the worker as he carries the bricks up the ladder? A height, time and volume B height, time and weight C height, volume and weight D time, volume and weight

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2017

37 The diagram shows a 3.0 Ω resistor connected to a 6.0 V battery. 6.0 V 3.0 Ω How much energy is transferred in the 3.0 Ω resistor in 30 seconds? A 15 J B 60 J C 360 J D 540 J

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2017

29 A worker carries bricks up a ladder. The following quantities are known. ● the height the bricks are lifted up ● the time taken for the worker to lift the bricks ● the volume of the bricks ● the weight of the bricks Which quantities are needed to calculate the useful power produced by the worker as he carries the bricks up the ladder? A height, time and volume B height, time and weight C height, volume and weight D time, volume and weight

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2017

37 The diagram shows a 3.0 Ω resistor connected to a 6.0 V battery. 6.0 V 3.0 Ω How much energy is transferred in the 3.0 Ω resistor in 30 seconds? A 15 J B 60 J C 360 J D 540 J

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2017

30 A brick of mass 2.0 kg is at rest. It falls to the ground through a distance of 5.0 m. The acceleration of free fall g is 10 m / s2. Air resistance can be ignored. At what speed does the brick hit the ground? A 3.2 m / s B 7.1 m / s C 10 m / s D 50 m / s

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2018

31 Which source of energy is renewable? A geothermal B natural gas C nuclear fission D oil

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2018

29 What is the unit of work and what is an equivalent combination of units? equivalent unit combination A joule newton metre B joule newton / metre C newton joule metre D newton joule / metre

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2018

30 A pole-vaulter of mass 60 kg rises to a maximum height of 5.0 m and then falls to the ground. The acceleration of free fall g is 10 m / s2. Air resistance can be ignored. At what speed does the pole-vaulter hit the ground when she falls? A 5.0 m / s B 10 m / s C 25 m / s D 100 m / s

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2018

29 An object X with mass 2.0 kg is moving with a speed of 4.0 m / s. Which object has kinetic energy equal to that of object X? speed of object mass of object / kg m / s A 0.50 16 B 1.0 8.0 C 8.0 2.0 D 16 1.0

1 marks

Answer: C

This question in 0654/21 May/June 2019

30 What are the units of work and power? work power A joule joule B joule watt C watt joule D watt watt

1 marks

Answer: B

This question in 0654/21 May/June 2019

29 An object X with mass 2.0 kg is moving with a speed of 4.0 m / s. Which object has kinetic energy equal to that of object X? speed of object mass of object / kg m / s A 0.50 16 B 1.0 8.0 C 8.0 2.0 D 16 1.0

1 marks

Answer: C

This question in 0654/22 May/June 2019

30 For which list is the Sun the original source of the energy for all of the energy resources? A coal, geothermal and wind B coal, hydroelectric and nuclear fission C hydroelectric, oil and wind D oil, geothermal and nuclear fission

1 marks

Answer: C

This question in 0654/22 May/June 2019

30 An object X with mass 2.0 kg is moving with a speed of 4.0 m / s. Which object has kinetic energy equal to that of object X? speed of object mass of object / kg m / s A 0.50 16 B 1.0 8.0 C 8.0 2.0 D 16 1.0

1 marks

Answer: C

This question in 0654/23 May/June 2019

31 A car engine transfers 80 000 kJ of energy in 5.0 minutes. What is the output power of the engine? A 267 kW B 400 kW C 16 000 kW D 24 000 kW

1 marks

Answer: A

This question in 0654/23 May/June 2019

30 An engine is doing work on a car as the car moves along a road. Which two changes must result in less work being done on the car by the engine? A decreasing the engine’s force on the car and decreasing the distance moved by the car B decreasing the engine’s force on the car and increasing the distance moved by the car C increasing the engine’s force on the car and decreasing the distance moved by the car D increasing the engine’s force on the car and increasing the distance moved by the car

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2019

31 A machine has useful output energy of 1000 J, and wasted energy of 300 J. Which expression is used to calculate the efficiency of the machine? 300 × 100% A (1000 + 300) B 300 × 100% 1000 (1000 − 300) C × 100% 1000 D 1000 × 100% (1000 + 300)

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2019

37 An electric kettle is rated at 3.0 kW and is connected to a 250 V supply. The kettle is switched on for 2.0 minutes. Which row shows the current in the kettle and the energy transferred by the kettle? current / A energy / J A 12 6000 B 12 360 000 C 750 6000 D 750 360 000

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2019

30 A force acts on an object and moves it a certain distance in the direction of the force. The force is now doubled and the distance increases by a factor of 3. What happens to the work done by the force on the object? A It increases by a factor of 1.5. B It doubles. C It increases by a factor of 3. D It increases by a factor of 6.

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2019

30 A body moving at speed v has kinetic energy E. What is the speed of the body when its kinetic energy is 4.0 E? A 0.25 v B 2.0 v C 4.0 v D 16 v

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2019

31 A student wishes to measure his average power when running up a flight of steps. The energy transferred is 7.0 kJ and the time taken is 14 seconds. What is the student’s average power? A 0.0020 W B 98 W C 500 W D 98 000 W

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2019

30 An object is moving along a straight path with 200 J of kinetic energy. A resultant force acts on the object, in the direction it is moving, for a distance of 20 m. The kinetic energy of the object increases to 1000 J. What is the magnitude of the force? A 10 N B 40 N C 50 N D 60 N

1 marks

Answer: B

This question in 0654/21 May/June 2020

31 An object of mass m moving with speed v has kinetic energy E. v . A second object, also of mass m, moves with speed 2 What is the kinetic energy of the second object? E E A B C E D 2E 4 2

1 marks

Answer: A

This question in 0654/21 May/June 2020

32 Which statement describes the production of electricity from a renewable energy source? A Coal is burnt to release energy to make steam that turns a generator. B Moving air passes over blades that rotate and turn a generator. C Nuclear fission releases energy to make steam that turns a generator. D Oil is burnt to release energy to make steam that turns a generator.

1 marks

Answer: B

This question in 0654/21 May/June 2020

29 An object of mass m moving with speed v has kinetic energy E. v . A second object, also of mass m, moves with speed 2 What is the kinetic energy of the second object? E E A B C E D 2E 4 2

1 marks

Answer: A

This question in 0654/22 May/June 2020

30 Which energy resource does not have the Sun as its source of energy? A coal B geothermal C hydroelectric D waves

1 marks

Answer: B

This question in 0654/22 May/June 2020

29 An object of mass m moving with speed v has kinetic energy E. v . A second object, also of mass m, moves with speed 2 What is the kinetic energy of the second object? E E A B C E D 2E 4 2

1 marks

Answer: A

This question in 0654/23 May/June 2020

30 Which equation relates power P to energy change ∆E and time t ? ∆ E 2 A P = × 2 t B P = 1 2 × ∆E2 × t ∆ E C P = t D P = ∆E × t

1 marks

Answer: C

This question in 0654/23 May/June 2020

31 In which pair do both energy resources have the Sun as the source of their energy? A geothermal energy and tidal energy B hydroelectric energy and wind energy C nuclear energy and chemical energy stored in fuel D solar energy and nuclear energy

1 marks

Answer: B

This question in 0654/23 May/June 2020

36 A lamp is connected to a 6.0 V battery. The current in the lamp is 1.5 A. 6.0 V 1.5 A How much energy is used by the lamp in 10 minutes? A 0.90 J B 40 J C 2400 J D 5400 J

1 marks

Answer: D

This question in 0654/23 May/June 2020

31 Electricity is generated in power stations. Many power stations use steam to drive turbines. Which type of power station does not use steam? A chemical energy (fuel) power stations B geothermal energy power stations C hydroelectric energy power stations D nuclear energy power stations

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2020

30 A box of mass 8.0 kg is lifted vertically from the ground on to a shelf that is 2.0 m above the ground. The gravitational field strength g is 10 N / kg. How much work is done as the box is lifted on to the shelf? A 4.0 J B 16 J C 40 J D 160 J

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2020

31 Electricity is generated in power stations. Many power stations use steam to drive turbines. Which type of power station does not use steam? A chemical energy (fuel) power stations B geothermal energy power stations C hydroelectric energy power stations D nuclear energy power stations

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2020

30 The diagram shows a box of weight 600 N being pulled up a frictionless slope by a force. force Y 5.0 m 3.0 m X 4.0 m How much work is done against gravity in moving the box from X to Y? A 600 J B 1800 J C 24 000 J D 30 000 J

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2020

31 Electricity is generated in power stations. Many power stations use steam to drive turbines. Which type of power station does not use steam? A chemical energy (fuel) power stations B geothermal energy power stations C hydroelectric energy power stations D nuclear energy power stations

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2020

37 A heating element in an electric kettle has a resistance of 24 . When the kettle is connected to a 240 V supply, it takes 2.5 minutes to boil some water. How much energy is used to boil the water? A 16 J B 960 J C 6000 J D 360 000 J

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2020

30 A crane lifts a load of mass 300 kg through a height of 20 m in 1.0 minute. The gravitational field strength g is 10 N / kg. What is the average power output of the crane during this task? A 600 W B 1000 W C 36 000 W D 60 000 W

1 marks

Answer: B

This question in 0654/22 Feb/March 2021

31 The diagram shows a man diving into water. Which form of energy is increasing as he accelerates downwards through the air? A chemical B elastic potential (strain) C gravitational potential D kinetic

1 marks

Answer: D

This question in 0654/21 May/June 2021

31 The diagram shows a man diving into water. Which form of energy is increasing as he accelerates downwards through the air? A chemical B elastic potential (strain) C gravitational potential D kinetic

1 marks

Answer: D

This question in 0654/22 May/June 2021

30 The diagram shows a man diving into water. Which form of energy is increasing as he accelerates downwards through the air? A chemical B elastic potential (strain) C gravitational potential D kinetic

1 marks

Answer: D

This question in 0654/23 May/June 2021

30 A ball falls vertically downwards. Which energy transfer takes place as the ball accelerates downwards? A gravitational potential to elastic potential (strain) B gravitational potential to kinetic C elastic potential (strain) to kinetic D kinetic to gravitational potential

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2021

31 A 250 W electric motor lifts a 50 N load through a height of 4.0 m in 3.0 s. What is the efficiency of this system of lifting the load? A 15% B 27% C 38% D 67%

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2021

31 A stone falls from a bench. Which row describes how the gravitational potential energy and the kinetic energy of the stone change as it falls? gravitational kinetic energy potential energy A decreases increases B decreases stays the same C increases decreases D increases stays the same

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2021

32 A lamp transfers 20 J of electrical energy into 12 J of useful light energy. What is the efficiency of the lamp? A 33% B 40% C 60% D 66%

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2021

30 A ball of mass 0.25 kg is thrown from the ground to a height of 5.0 m. The gravitational field strength g is 10 N / kg. Which expression gives the increase in gravitational potential energy of the ball? A [(0.25  10) + 5.0] J B [0.25  10  5.0] J  5.0  C   J  (0.25  10)  D [(5.0 + 0.25)  10] J

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2021

31 A lamp produces 760 J of wasted energy for every 1000 J of electrical energy supplied to it. What is the efficiency of the lamp? A 0.24% B 0.76% C 24% D 76%

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2021

30 Which source of energy is non-renewable? A hydroelectric B nuclear fission C tides D waves

1 marks

Answer: B

This question in 0654/22 Feb/March 2022

30 An object moving at speed v has kinetic energy E. What is the speed of the object when its kinetic energy is 4.0 E ? A 0.25 v B 2.0 v C 4.0 v D 16 v

1 marks

Answer: B

This question in 0654/21 May/June 2022

31 A passenger lift (elevator) has a total weight of 4000 N, including the people inside it. The power output of the lift motor is 800 W. How much time does it take for the lift to rise 12 m vertically? A 2.4 s B 6.0 s C 24 s D 60 s

1 marks

Answer: D

This question in 0654/21 May/June 2022

30 An object moving at speed v has kinetic energy E. What is the speed of the object when its kinetic energy is 4.0 E ? A 0.25 v B 2.0 v C 4.0 v D 16 v

1 marks

Answer: B

This question in 0654/22 May/June 2022

31 The power input to a power station is 800 MW. The useful electrical power output is 320 MW. What is the efficiency of the power station? A 0.40% B 2.5% C 40% D 250%

1 marks

Answer: C

This question in 0654/22 May/June 2022

30 An object moving at speed v has kinetic energy E. What is the speed of the object when its kinetic energy is 4.0 E ? A 0.25 v B 2.0 v C 4.0 v D 16 v

1 marks

Answer: B

This question in 0654/23 May/June 2022

32 From which type of energy is electrical energy transferred in a hydroelectric power station? A chemical potential energy B elastic potential (strain) energy C gravitational potential energy D nuclear energy

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2022

30 A force acting on an object increases the kinetic energy of the object from 20 J to 50 J in 5.0 s. What is the average power produced by the force? A 4.0 W B 6.0 W C 10 W D 14 W

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2022

31 From which type of energy is electrical energy transferred in a hydroelectric power station? A chemical potential energy B elastic potential (strain) energy C gravitational potential energy D nuclear energy

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2022

30 Which equation for kinetic energy (K.E.) is correct? A K.E. = 1 2 (mv)2 B K.E. = 1 2 mv 2 C K.E. = mv 2 D K.E. = mgh

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2022

31 A car accelerates uniformly from rest along a horizontal road. After 5.0 s, its kinetic energy is 400 kJ. What is the useful power produced by the engine of the car? A 80 W B 2000 W C 80 000 W D 2 000 000 W

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2022

32 From which type of energy is electrical energy transferred in a hydroelectric power station? A chemical potential energy B elastic potential (strain) energy C gravitational potential energy D nuclear energy

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2022

30 Which source of energy is non-renewable? A chemical energy in a fossil fuel B energy in tides C geothermal energy D wind energy

1 marks

Answer: A

This question in 0654/22 Feb/March 2023

37 There is a current of 3.0 A in a resistor. The potential difference across the resistor is 3.0 V. How much electrical energy is transferred to other forms in 3.0 minutes? A 3.0 J B 9.0 J C 540 J D 1620 J

1 marks

Answer: D

This question in 0654/22 Feb/March 2023

30 A machine has useful output energy of 1000 J and wasted energy of 300 J. Which expression is used to calculate the efficiency of the machine? 300  100% A 1000  300 B 300  100% 1000 1000  300 C  100% 1000 1000  100% D 1000  300

1 marks

Answer: D

This question in 0654/21 May/June 2023

37 An electric kettle is connected to a 250 V supply. The current in the heating element of the kettle is 10 A. How much electrical energy is transferred in 3.0 minutes? A 75 J B 4500 J C 7500 J D 450 000 J

1 marks

Answer: D

This question in 0654/21 May/June 2023

39 Cables transmit electrical power. The power input to the cables is constant, but the voltage input is increased. What happens to the power loss from the cables, and what happens to the current in the cables? power loss current in from cables cables A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: A

This question in 0654/22 May/June 2023

30 Electricity can be generated in different types of power station. Which statement about geothermal power and nuclear power is correct? A Geothermal power and nuclear power are both renewable. B Geothermal power and nuclear power are both non-renewable. C Geothermal power is renewable but nuclear power is not. D Nuclear power is renewable but geothermal power is not.

1 marks

Answer: C

This question in 0654/23 May/June 2023

31 What is the definition of efficiency? energy input A  100% useful energy output energy input B  100% wasted energy useful energy output C  100% energy input wasted energy D  100% energy input

1 marks

Answer: C

This question in 0654/23 May/June 2023

31 A hydroelectric energy storage scheme stores energy by pumping water up a mountain into a lake behind a dam. In 1.0 s, 10 000 kg of water is pumped into the lake and gains a height of 150 m. The efficiency of this process is 60%. Gravitational field strength = 10 N / kg. What is the energy input in 1.0 s? A 9.0  105 J B 2.5  106 J C 9.0  106 J D 2.5  107 J

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2023

32 For which energy resource is the Sun the source of all the energy stored? A geothermal B nuclear fission C tidal D wind

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2023

30 A force of 4.0 N acts on an object for 4.0 s. The object moves a distance of 8.0 m in the direction of the force. What is the work done by the force? A 1.0 J B 2.0 J C 16 J D 32 J

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2023

31 An electric motor transfers 4000 J of electrical energy to useful energy and 12 000 J of electrical energy is wasted. What is the efficiency of the motor? A 25% B 33% C 50% D 75%

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2023

29 A 900 W oven operates for 2.0 minutes. How much energy is transferred by the oven? A 7.5 J B 450 J C 1.8 kJ D 108 kJ

1 marks

Answer: D

This question in 0654/22 Feb/March 2024

30 Which list of energy sources contains only non-renewable sources? A coal, gas, nuclear fission B coal, gas, geothermal C gas, geothermal, nuclear fission D gas, solar, wind

1 marks

Answer: A

This question in 0654/22 Feb/March 2024

30 An object of mass 5.0 kg falls vertically from rest through a height of 13 m in a vacuum. The gravitational field strength g is 10 N / kg. What is the final speed of the object? A 8.1 m / s B 10 m / s C 11 m / s D 16 m / s

1 marks

Answer: D

This question in 0654/21 May/June 2024

31 For which energy resource is the Sun not the source of the energy? A geothermal B natural gas C water behind a hydroelectric dam D wind

1 marks

Answer: A

This question in 0654/21 May/June 2024

30 A paralympic athlete of mass 70 kg uses a wheelchair of mass 10 kg in a race. What is the kinetic energy of the athlete and wheelchair when they are moving at 6.0 m / s? A 240 J B 480 J C 1440 J D 2880 J

1 marks

Answer: C

This question in 0654/22 May/June 2024

31 The table shows four sources of energy used to generate electricity. Which row about the energy source is correct? source renewable reliable at all times A coal yes no B nuclear fission no yes C tides no no D wind yes yes

1 marks

Answer: B

This question in 0654/22 May/June 2024

37 A kettle is connected to a 230 V mains supply. The current in the kettle is 10 A. How much energy is transferred in 3.0 minutes? A 12.8 J B 767 J C 6900 J D 414 000 J

1 marks

Answer: D

This question in 0654/22 May/June 2024

31 Four different kettles contain different masses of water. They are used to heat the water from room temperature to boiling point. The kettles take different times to do this. Which kettle has the lowest useful power output? time to heat mass of water to boiling water / g point / minute A 1000 3.0 B 1000 5.0 C 2500 3.0 D 2500 5.0

1 marks

Answer: B

This question in 0654/23 May/June 2024

31 The Sun is the source of energy for most energy resources. In which group of resources is energy input from the Sun the only source of energy? A coal, geothermal, gasoline B hydroelectric, tidal, waves C natural gas, solar, wind D nuclear, solar, wood

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2024

30 A rope is used to pull a block of mass 25 kg up a slope from point X to point Y. Three distances are shown on the diagram. The gravitational field strength g is 10 N / kg. Y 5.0 m force from rope 3.0 m block X 4.0 m What is the increase in gravitational potential energy of the block? A 125 J B 750 J C 1000 J D 1250 J

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2024

37 A heating element in an electric kettle has a resistance of 24 . When the kettle is connected to a 240 V supply, it takes 2.5 minutes to boil some water. How much energy is used to boil the water? A 16 J B 960 J C 6000 J D 360 000 J

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2024

30 Which energy resource does not have the Sun as its source of energy? A coal B geothermal C hydroelectric D water waves

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2024

30 Which expression gives the kinetic energy of an object of mass m travelling at speed v ? A 1  m  v 2 B 1  m  v 2 2 C 1  (m  v)2 2 D ( 2 1  m  v)2

1 marks

Answer: B

This question in 0654/22 Feb/March 2025

29 What is the unit of work and what is an equivalent combination of units? equivalent unit combination A joule newton metre B joule newton / metre C newton joule metre D newton joule / metre

1 marks

Answer: A

This question in 0654/21 May/June 2025

30 The total energy input to an electric lamp is 20 J. The useful energy output is 12 J. What is the efficiency of the lamp? A 33% B 40% C 60% D 66%

1 marks

Answer: C

This question in 0654/21 May/June 2025

29 A lamp produces 760 J of wasted energy for every 1000 J of energy supplied to it. What is the efficiency of the lamp? A 0.24% B 0.76% C 24% D 76%

1 marks

Answer: C

This question in 0654/22 May/June 2025

29 An object X with mass 2.0 kg is moving with a speed of 4.0 m / s. Object Y has kinetic energy equal to that of object X. Which row shows the mass and the speed of object Y? mass of speed of object Y object Y / kg m / s A 0.50 16 B 1.0 8.0 C 8.0 2.0 D 16 1.0

1 marks

Answer: C

This question in 0654/23 May/June 2025

37 There is a current of 0.50 A in a lamp when the potential difference (p.d.) across the lamp is 12 V. How much time does it take for the lamp to transfer 100 J of energy? A 0.060 s B 4.2 s C 17 s D 600 s

1 marks

Answer: C

This question in 0654/23 May/June 2025

30 The power of sunlight falling on each m2 of a solar panel is 200 W. The solar panel has an area of 2.0 m2. The efficiency of the solar panel is 20%. What is the useful power output of the solar panel? A 80 W B 400 W C 500 W D 2000 W

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2025

30 A 60 W lamp is switched on and 30 J of energy is transferred by the lamp. How long is the lamp switched on for? A 0.50 s B 2.0 s C 90 s D 1800 s

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2025