Question 1

Which is the symbol for a thermistor?

Accepted Answer

D

Answer

C

Answer

A

Answer

B

Question 2

Which is true of a parallel circuit?

Accepted Answer

The currents in each separate branch add up to the total current that leaves the cell.

Answer

The potential difference across each lamp in a parallel circuit adds up to give the potential difference of a battery or cell.

Answer

The circuit has a single closed loop.

Answer

The current is the same at each point in the parallel circuit.

Question 3

Which is the unit of electrical resistance?

Accepted Answer

the ohm

Answer

the ampere

Answer

the coulomb

Answer

the volt

Question 4

Which sentence regarding the electrical resistance of components is correct?

Accepted Answer

The resistance of a lamp increases as the current flowing through it increases.

Answer

The resistance of a light-dependent resistor increases as light level increases.

Answer

A diode’s forward resistance is very high.

Answer

The resistance of a thermistor increases as temperature increases.

Question 5

Which statement about the resistance of a component is true?

Accepted Answer

The total resistance is equal to the potential difference across it divided by the total current flowing through it.

Answer

If two resistors are arranged in parallel, the total resistance is increased because the total current decreases but the potential difference is the same.

Answer

If two resistors are arranged in series, the total resistance is decreased because the current is greater but the potential difference is the same.

Answer

Two fixed resistors in parallel will have double the total resistance of a single resistor.

Question 6

Which graph is characteristic of a diode?

Accepted Answer

A

Answer

B

Answer

C

Question 7

Which statement about current, p.d., and resistance is true?

Accepted Answer

If the current in a circuit increases, and the resistance stays the same, then the cell p.d. must have increased.

Answer

If you keep the potential difference the same but increase the resistance, then the current will increase.

Answer

Resistance is measured in amperes.

Answer

For a circuit where you don’t change the resistance, increasing the potential difference will decrease the current.

Question 8

Choose the correct answer about the circuit to show how to calculate the resistance of the lamp.

Accepted Answer

The current at X through the resistor R is 1.2 A.

Answer

The potential difference across the lamp is 1.2 V.

Answer

The current at Y through the lamp is 2.0 A.

Answer

The resistance of the lamp is 10 Ω.

Question 9

What is the unit for current?

Accepted Answer

A

Answer

C

Answer

t

Answer

V

Question 10

What is the unit for charge flow?

Accepted Answer

the coulomb

Answer

the ampere

Answer

the volt

Answer

the ohm

Question 11

What is the correct equation to calculate charge flow?

Accepted Answer

charge flow = current x time

Answer

time = charge flow x current

Answer

current = charge flow x time

Answer

charge flow = current / time

Question 12

What is the correct equation to calculate potential difference?

Accepted Answer

potential difference = current x resistance

Answer

potential difference = resistance / charge flow

Answer

potential difference = current / resistance

Answer

potential difference = current x charge flow

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