Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Energy Resources and Energy Transfers
175 practice questions
Topics covered
Practice questions
11–20 of 82 · Easy
Question 11
1 mark · Easy
Answer and see the solution →State the principle of conservation of energy.
Question 12
2 marks · Easy
Answer and see the solution →A kettle transfers 320 kJ of energy to water, and 40 kJ is wasted as heat to the air. Calculate the efficiency of the kettle. Give your answer as a percentage.
Question 13
3 marks · Easy
Answer and see the solution →A student rubs their hands together on a cold day.
(a)[1 mark]Describe the main energy transfer that occurs while rubbing hands.
(b)[1 mark]Which energy store increases as the hands become warmer?
(c)[1 mark]Explain why rubbing hands is not 100% efficient.
Question 14
1 mark · Easy
Answer and check →Which method of thermal energy transfer mostly explains why the handle of a metal spoon becomes hot when placed in hot soup?
- A.Conduction
- B.Convection
- C.Radiation
- D.Insulation
Question 15
3 marks · Easy
Answer and see the solution →Describe a simple experiment you could carry out to show that air is a poor conductor of heat. Include the setup and an observation you would make.
Question 16
3 marks · Easy
Answer and see the solution →A student is asked to explain how a woolly jumper helps to keep you warm on a cold day.
(a)[1 mark]Name the process by which heat would escape without a jumper.
(b)[1 mark]Describe how the wool reduces heat loss.
(c)[1 mark]Name another common household use of a similar insulating principle.
Question 17
1 mark · Easy
Answer and check →Which physical quantity is equal to the work done on an object?
- A.Force
- B.Energy transferred
- C.Distance moved
- D.Power
Question 18
2 marks · Easy
Answer and see the solution →A small box is pushed with a force of 25 N along a smooth surface for a distance of 3 m in the direction of the force.
(a)[1 mark]State the equation relating work done, force and distance moved.
(b)[1 mark]Calculate the work done on the box.
Question 19
1 mark · Easy
Answer and see the solution →State the SI unit of work done.
Question 20
2 marks · Easy
Answer and see the solution →An athlete holds a heavy backpack still above their head for 10 seconds. Explain why no work is done on the backpack, even though the athlete is exerting a force upward.