Question 1

The current in a wire is 20 mA.

How many electrons pass a point in the wire in 2 minutes?

  A  

2.5 × 1017

  B  

1.5 × 1019

  C  

2.5 × 1020

  D  

1.5 × 1022

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Question 2

A gas containing doubly-charged ions flows to give an electric current of 0.64 A

How many ions pass a point in 1.0 minute?

  A  

2.0 × 1018

  B  

4.0 × 1018

  C  

1.2 × 1020


  D  

2.4 × 1020


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Question 3

A mobile phone operates at a constant power of 200 mW

It has a 3.7 V lithium-ion battery that has a charge capacity of 9,400 C

What is the time taken for the battery to discharge completely?

  A  

2 hours

  B  

48 hours

  C  

120 hours

  D  

140 hours

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Question 4

Which electrical quantity has S.I. units ampere-second (As)?

  A  

charge

  B  

current

  C  

resistance

  D  

potential difference


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Question 5

The diagram below shows the motion of positive and negative particles in a conducting solution.


Which statement is correct?


  A  

the current in the solution is zero

  B  

the conventional current is to the left


  C  

the positive particles are always protons


  D  

the negative particles are always electrons


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Question 6

One million electrons travel between two points in a circuit.

The total energy gained by the electrons is 1.6 × 10−10 J.

What is the potential difference between the two points?

  A  

1.6 × 10−16 V

  B  

1.6 × 10−4 V

  C  

1.0 × 103 V

  D  

1.0 × 109 V

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Question 7

The diagram shows the conventional currents entering and leaving a junction in an electric circuit.

I1 , I2 , I3 and I4 are all positive.

Which statement is always true?

  A  

I1 + I2 = I3 + I4

  B  

I1 - I2 + I3 - I4 = 0

  C  

I1 = I2 and I3 = I4

  D  

I1 + I2 + I3 + I4 = 0

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Question 8

A copper wire is connected across a cell. The conduction electrons within the copper wire move.

Which statement is correct about these electrons?

  A  

they drift towards the negative end of the cell

  B  

they have random speeds because of collisions with other electrons

  C  

they travel through the wire at the speed of light

  D  

they collide with vibrating copper ions

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Question 9

One of Kirchhoff’s laws is stated below.

The sum of the currents entering a point in a circuit is equal to the sum of the currents leaving the same point.

Which quantity is conserved according to this law?

  A  

charge

  B  

energy

  C  

mass


  D  

potential difference

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Question 10

The potential difference across a lamp is 2.5 V. The current in the lamp is 20 mA.

What is the energy dissipated in the lamp in 3.0 hours?

  A  

0.050 J

  B  

0.15 J

  C  

9.0 J

  D  

540 J

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