Electrical safety — Paper 2 · IGCSE Physics 0625

34 After some building work in a house, a bare (uninsulated) live wire is left protruding from a wall. What is the greatest hazard? A a fire B a fuse blows C an electric shock D no current flows

1 marks

Answer: C

This question in 0625/22 Feb/March 2016

33 A domestic circuit includes a 30 A fuse. This protects the wiring if there is too much current in the circuit. In which wire is the 30 A fuse positioned, and what does it do when it operates? position operation A live wire disconnects the circuit B live wire reduces the current to 30 A C neutral wire disconnects the circuit D neutral wire reduces the current to 30 A

1 marks

Answer: A

This question in 0625/21 May/June 2016

33 A domestic circuit includes a 30 A fuse. This protects the wiring if there is too much current in the circuit. In which wire is the 30 A fuse positioned, and what does it do when it operates? position operation A live wire disconnects the circuit B live wire reduces the current to 30 A C neutral wire disconnects the circuit D neutral wire reduces the current to 30 A

1 marks

Answer: A

This question in 0625/22 May/June 2016

33 A domestic circuit includes a 30 A fuse. This protects the wiring if there is too much current in the circuit. In which wire is the 30 A fuse positioned, and what does it do when it operates? position operation A live wire disconnects the circuit B live wire reduces the current to 30 A C neutral wire disconnects the circuit D neutral wire reduces the current to 30 A

1 marks

Answer: A

This question in 0625/23 May/June 2016

35 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 0625/21 Oct/Nov 2016

35 An electric kettle has a metal casing. The cable for the kettle contains a wire that is connected to the earth pin of the plug. Which danger does this guard against? A the cable to the kettle becoming too hot B the casing of the kettle becoming live C the casing of the kettle becoming wet on the outside D the casing of the kettle overheating

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2016

35 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 0625/23 Oct/Nov 2016

34 In this circuit, a component at X automatically protects the wiring from overheating if there is a fault. electrical supply Which row indicates components that are suitable? cron fuse switch A v Jv Jv key B v v x ¥ = suitable Cc v x v X = not suitable D x v x

1 marks

Answer: B

This question in 0625/22 Feb/March 2017

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 0625/21 Oct/Nov 2018

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 0625/22 Oct/Nov 2018

33 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 0625/23 Oct/Nov 2018

35 The current in a kettle is 10 A and the kettle is protected by a 13 A fuse. The owner of the kettle replaces the 13 A fuse with a 3 A fuse. What happens when the kettle is switched on? A The fuse melts and the kettle might be damaged. B The fuse melts and the kettle is undamaged. C The fuse does not melt and the kettle works correctly. D The fuse does not melt but the kettle fails to work.

1 marks

Answer: B

This question in 0625/22 Feb/March 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 0625/21 May/June 2019

35 Which components are designed to improve the safe working of a mains electrical supply? circuit earth ; fuse breaker wire Jv Jv 0 OO WwW PY << x <4 x v x v

1 marks

Answer: D

This question in 0625/22 May/June 2019

35 A simple wiring diagram for an electric cooker is shown. electric cooker metal casing live neutral earth connection to casing Why is there a wire connecting the metal case of the cooker to earth? A It improves the efficiency of the cooker. B It prevents the metal case from becoming too hot when the cooker is left on. C It reduces the risk of an electric shock if the live wire touches the metal case. D The electric cooker will not switch on without it.

1 marks

Answer: C

This question in 0625/23 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 0625/21 Oct/Nov 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 0625/22 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 0625/22 Oct/Nov 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 0625/23 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 0625/21 Oct/Nov 2021

33 The diagram shows a motor connected to an a.c. supply. The circuit is incomplete. X Y M Which device needs to be connected between point X and point Y to prevent the wires from overheating if a fault in the motor causes the current to get too high? A an ammeter B a fuse C a transformer D a length of thick copper wire

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2021

33 Circuit breakers and fuses are devices used to protect a circuit from overloading. Which statement correctly describes the difference between a circuit breaker and a fuse? A Circuit breakers can be reset if they operate but fuses need to be replaced. B Circuit breakers need to be replaced if they operate but fuses can be reset. C Circuit breakers can be used in an a.c. circuit but fuses cannot. D Circuit breakers cannot be used in an a.c. circuit but fuses can.

1 marks

Answer: A

This question in 0625/23 Oct/Nov 2021

34 Electrical energy is transferred by transmission lines at high voltage. Which statement explains why a high voltage is used? A The voltage is alternating. B The transmission lines have a larger resistance. C The transmission lines carry greater power. D There is a smaller current in the transmission lines for the same power.

1 marks

Answer: D

This question in 0625/23 Oct/Nov 2021

34 The diagram shows an electric drill and safety guard. safety guard in electric motor closed position drill The drill requires the logic circuit shown. starting switch on 1 A off 0 motor on 1 motor motor off 0 safety guard open 0 B closed 1 alarm on 1 ? alarm alarm off 0 The circuit must only allow the motor to start when the safety guard is closed. If the safety guard is not closed when the starting switch is on, the alarm must sound. Which logic gate is missing from the circuit? A NOT B NAND C AND D NOR

1 marks

Answer: C

This question in 0625/22 Feb/March 2022

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 0625/21 Oct/Nov 2022

32 Which diagram shows the circuit symbol for a fuse? A B C D

1 marks

Answer: D

This question in 0625/22 Oct/Nov 2022

36 Several scientists are working in a laboratory. The scientists are experimenting with sources which emit ionising radiation. Each scientist is given a list of safety rules. Three of the rules are shown. 1 Keep at least 2 m away from other people. 2 Do not stay longer than 4 hours per day in the laboratory. 3 Stay behind the lead-lined screen. Which safety rules are for protection against the effects of ionising radiation? 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 0625/22 Feb/March 2023

31 A student is investigating the count rate of a radioactive substance. How must he adjust his reading for the background count? A Add the background count to his reading. B Ignore the background count as it will not affect his reading. C Subtract the background count from his reading. D Take repeat readings to eliminate the background count.

1 marks

Answer: C

This question in 0625/22 Feb/March 2024

35 Which statement gives two safety precautions to take when a person is working with ionising radiation? A decrease exposure time and decrease distance between the person and the source B decrease exposure time and increase distance between the person and the source C increase exposure time and decrease distance between the person and the source D increase exposure time and increase distance between the person and the source

1 marks

Answer: B

This question in 0625/22 Feb/March 2024

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 0625/22 May/June 2024

36 Which type of radioactive source is suitable for use in measuring and controlling the thickness of paper in a paper-manufacturing factory? type of emission half-life A alpha long B alpha short C beta long D beta short

1 marks

Answer: C

This question in 0625/22 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 0625/21 May/June 2025

29 In which mains electric wires are the fuse and the switch placed? fuse switch A earth live B live live C live neutral D neutral neutral

1 marks

Answer: B

This question in 0625/23 May/June 2025

29 An electrical appliance has a symbol on it to indicate it is double-insulated. Which statement is correct? A A two-core, flexible cable with no earth wire is used to connect it to the mains supply. B It needs an earth wire that is connected to a fuse. C No fuse or circuit breaker is needed. D The cable should be connected to the live and earth connectors of the plug but not the neutral.

1 marks

Answer: A

This question in 0625/22 Oct/Nov 2025