Two uncharged metal spheres, not touching one another, are suspended by means of cotton thread. A positively charged rod is brought near. ++ ++ Which diagram shows what happens to the spheres?

5054_s07_qp_1

MCQ

2007

Paper 1, Variant 0

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shows two coils of wire wound on an iron ring. One coil is connected in series to a switch and a d.c. supply. The other coil is connected to a very sensitive centre-zero ammeter. iron ring open switch d.c. supply centre-zero ammeter At first the switch is open, as shown in . The following actions are taken in turn. Describe and explain what happens to the reading on the ammeter in each case. The switch is closed. The switch is left closed for a long time. The switch is opened.

5054_s10_qp_21

THEORY

2010

Paper 2, Variant 1

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The cable from the mains plug to a washing machine contains a live wire, a neutral wire and an earth wire. The earth wire is connected to the metal case of the washing machine. Explain how connecting the earth wire to the metal case makes the washing machine safer. When in use, the average input power to the washing machine is 500 W. Calculate the number of kW h of energy used by the washing machine in 45 minutes of use. number of kW h =

5054_s11_qp_22

THEORY

2011

Paper 2, Variant 2

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The diagram represents part of a household circuit containing an electric kettle. metal case element W X Y Which row correctly identifies the wires W, X and Y?

5054_s13_qp_11

MCQ

2013

Paper 1, Variant 1

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The diagram shows an alarm system. iron core pivot iron armature bell battery P What happens when battery P is disconnected?

5054_s18_qp_11

MCQ

2018

Paper 1, Variant 1

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The diagram shows an alarm system. iron core pivot iron armature bell battery P What happens when battery P is disconnected?

5054_s18_qp_12

MCQ

2018

Paper 1, Variant 2

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The cable to an electric cooker contains a live wire, a neutral wire and an earth wire. When the cooker is working correctly, in which wires are the currents equal?

5054_s19_qp_11

MCQ

2019

Paper 1, Variant 1

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The cable to an electric cooker contains a live wire, a neutral wire and an earth wire. When the cooker is working correctly, in which wires are the currents equal?

5054_s19_qp_12

MCQ

2019

Paper 1, Variant 2

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Why can birds stand on an overhead high voltage transmission line without suffering any harm?

5054_w05_qp_1

MCQ

2005

Paper 1, Variant 0

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The diagram shows an alarm system in which the switch S is shown...

5054_w10_qp_11

MCQ

2010

Paper 1, Variant 1

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