Electrical safety — Paper 2 · IGCSE Physics (9-1) 0972

34 Either a fuse or a circuit-breaker can be used to protect electrical cables from large currents that could cause overheating. X cable live electrical Y appliance supply neutral cable When a fuse is used, where should it be connected, and when a circuit-breaker is used, where should it be connected? position position of of fuse circuit-breaker A X X B X Y C Y X D Y Y

1 marks

Answer: A

This question in 0972/21 Oct/Nov 2018

35 An electric heater is plugged into the mains supply using a fused plug. The current in the heater is 10 A. The cable attached to the heater is rated at 15 A. The fuses available are rated at 1 A, 3 A, 5 A and 13 A. Which fuse should be used? A 1 A B 3 A C 5 A D 13 A

1 marks

Answer: D

This question in 0972/21 May/June 2019

35 Which components are designed to improve the safe working of a mains electrical supply? circuit breaker

1 marks

Answer: D

This question in 0972/22 May/June 2019

33 Where must a fuse be connected in a mains electric circuit? A the earth wire only B the live wire only C the neutral wire only D the live wire and the earth wire

1 marks

Answer: B

This question in 0972/21 Oct/Nov 2019

40 Why are some radioactive sources stored in boxes made from lead? A Lead absorbs emissions from the radioactive sources. B Lead decreases the half-life of radioactive sources. C Lead increases the half-life of radioactive sources. D Lead repels emissions from the radioactive sources.

1 marks

Answer: A

This question in 0972/21 Oct/Nov 2019

33 The metal cases of electrical appliances are connected to an earth wire. Which statement is not correct? A The live wire may become loose and touch the metal case. B If the metal case becomes live, the earth wire conducts current to the ground. C The earth wire needs to have a high resistance. D Earthing metal cases helps prevent a person from receiving an electric shock.

1 marks

Answer: C

This question in 0972/21 Oct/Nov 2021

32 Which diagram shows a circuit containing a battery, a fuse and a buzzer? A B C D

1 marks

Answer: D

This question in 0972/21 Oct/Nov 2022

29 A student connects the circuit shown. 1 bell 2 3 4 Which switches must be closed for the bell to ring without lighting the lamp? A 1 and 2 only B 1 and 3 only C 1, 3 and 4 D 2, 3 and 4

1 marks

Answer: B

This question in 0972/21 May/June 2023

30 Two electrical appliances are connected to the mains supply. The cable connected to one appliance includes an earth wire. The cable connected to the second appliance does not need an earth wire. What is a reason for this difference? A One appliance has a metal case, but the other appliance does not. B One appliance is fitted with a fuse, but the other appliance is not. C One appliance is fitted with a switch, but the other appliance is not. D One appliance needs more current than the other appliance.

1 marks

Answer: A

This question in 0972/22 May/June 2024

37 Which safety precautions must be taken when using a source of gamma radiation? 1 Reduce the distance between the source and the person. 2 Reduce the time of exposure to the radiation. 3 Use a suitable shielding material between the source and the person. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 0972/21 May/June 2025