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

32 A student sets up four circuits. In which circuit is there a heater in series with a fuse? A B C D

1 marks

Answer: C

This question in 0972/11 May/June 2019

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 0972/11 May/June 2019

34 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 0972/11 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 0972/11 Oct/Nov 2019

34 A student constructs four circuits, each containing a fuse. The fuse blows in one circuit and both lamps in the circuit go out. In which circuit does the fuse blow and both lamps go out? A B C D

1 marks

Answer: D

This question in 0972/11 May/June 2020

34 A student constructs four circuits, each containing a fuse. The fuse blows in one circuit and both lamps in the circuit go out. In which circuit does the fuse blow and both lamps go out? A B C D

1 marks

Answer: D

This question in 0972/12 May/June 2020

33 An electrical appliance is powered from a mains supply. The appliance normally uses a current of 3 A, but the current briefly rises to 4 A at the instant the appliance is switched on. The cable to the appliance is designed for currents up to 6 A. A fuse is used to protect the circuit. What should be the rating of the fuse? A 1 A B 3 A C 5 A D 13 A

1 marks

Answer: C

This question in 0972/11 Oct/Nov 2020

30 Which circuit contains a fuse? A B A V C D A

1 marks

Answer: C

This question in 0972/11 Oct/Nov 2021

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 0972/11 Oct/Nov 2021

34 A teacher asks, ‘Why do we put a fuse in a mains circuit?’ Student 1 says, ‘It protects the wiring from overheating.’ Student 2 says, ‘It protects us from getting a shock if we touch the live wire.’ Who is correct? A both students B neither student C student 1 only D student 2 only

1 marks

Answer: C

This question in 0972/11 Oct/Nov 2021

36 The current in a small electric heater is 4.0 A. The cable connected to the heater is able to carry currents up to 10 A. Fuses rated 1 A, 3 A, 5 A and 13 A are available. Which fuse should be used? A 1 A B 3 A C 5 A D 13 A

1 marks

Answer: C

This question in 0972/11 Oct/Nov 2021

32 What is the advantage of connecting lamps in parallel in a lighting circuit? A A smaller fuse is needed to protect the lamps. B If the filament of one lamp breaks, the remaining lamps stay lit. C The current taken from the supply is less. D The lamps use less power.

1 marks

Answer: B

This question in 0972/11 May/June 2022

34 Why is a fuse used in an electrical circuit? A so that the current can have only one value B to prevent the current becoming too large C to provide a path to earth if a fault occurs D to save electrical energy

1 marks

Answer: B

This question in 0972/11 May/June 2022

34 Why is a fuse used in an electrical circuit? A so that the current can have only one value B to prevent the current becoming too large C to provide a path to earth if a fault occurs D to save electrical energy

1 marks

Answer: B

This question in 0972/12 May/June 2022

30 A double-insulated electrical appliance must be connected safely to the electricity supply. Which statement is correct? A It must be connected with a fuse and an earth wire. B It can be connected with a fuse only. C It can be connected with an earth wire only. D It does not need a fuse or an earth wire.

1 marks

Answer: B

This question in 0972/11 May/June 2023

30 Which statement about electrical safety is correct? A If a device is double insulated, it does not need a fuse. B A device that has a normal operating current of 3.0 A must be protected by a 3.0 A fuse. C Switches must always be connected into the live supply wire. D The metal casing of an electrical device must be connected to the neutral wire.

1 marks

Answer: C

This question in 0972/12 May/June 2023

30 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 1.0 A, 3.0 A, 5.0 A and 13 A. Which fuse should be used? A 1.0 A B 3.0 A C 5.0 A D 13 A

1 marks

Answer: D

This question in 0972/11 Oct/Nov 2023

37 A scientist carries out an experiment using a sealed source which emits β-particles. The range of the β-particles in the air is about 30 cm. Which precaution is the most effective to protect the scientist from the radiation? A handling the source with long tongs B keeping the temperature of the source low C opening all windows in the laboratory D washing his hands before leaving the laboratory

1 marks

Answer: A

This question in 0972/11 Oct/Nov 2023

29 The metal case of an electrical appliance is fitted with an earth connection. What is the purpose of this? A to complete the circuit supplying the appliance so that it works B to ensure that the cables supplying the appliance do not become damp C to prevent the cables supplying the appliance from overheating D to protect a user of the appliance from electric shock

1 marks

Answer: D

This question in 0972/11 May/June 2024

30 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 0972/12 May/June 2024

30 The mains voltage is 120 V. Which fuse should be fitted to an electric kettle with a power of 1.5 kW? A 3 A B 5 A C 10 A D 13 A

1 marks

Answer: D

This question in 0972/11 Oct/Nov 2024

28 A mains-operated radio is a double-insulated appliance. Which statement is correct? A The radio does not need a neutral connection. B The radio must be earthed. C The radio circuit is safe without a fuse or trip switch. D The outer casing of the radio cannot become live.

1 marks

Answer: D

This question in 0972/11 May/June 2025

31 A 240 V mains-powered vacuum cleaner has a power output of 2700 W. Which fuse is suitable for use in the plug of the vacuum cleaner? A 3 A B 5 A C 10 A D 13 A

1 marks

Answer: D

This question in 0972/12 May/June 2025