Electricity GCSE (Test 1)

Q1.

A transformer is used to:

1. Increase or decrease voltage
2. Convert AC to DC
3. Convert DC to AC
4. Store electrical energy

Q2.

In a series circuit, the total resistance is:

1. Less than the smallest individual resistance
2. Equal to the largest individual resistance
3. The sum of the individual resistances
4. The reciprocal of the sum of the reciprocals of the individual resistances

Q3.

A filament bulb is connected to a power supply. As the bulb heats up, what happens to its resistance?

1. The resistance remains constant
2. The resistance depends on the type of filament used
3. The resistance increases
4. The resistance decreases

Q4.

The formula for calculating electrical power is:

1. $P = \frac{V^{2}}{R}$
2. $P = I^{2} R$
3. P = I × V
4. All of the above

Q5.

An electrical component which emits light only when a current flows through it in the forward direction is:

1. A capacitor
2. A diode
3. A transistor
4. A resistor

Q6.

Why does the resistance of a filament bulb increase as it heats up?

1. The filament material becomes a better conductor of electricity
2. The filament material becomes a poorer conductor of electricity
3. The filament material undergoes a phase change
4. The filament material emits more light as it heats up

Q7.

Complete the following sentence by selecting the correct choice: In the UK, the frequency of the a.c. mains electricity supply is ___________________ hertz.

1. 65
2. 60
3. 50
4. 40

Q8.

Current is:

1. The rate of flow of electrons
2. The potential difference between two points
3. The resistance of a conductor
4. The power dissipated in a circuit

Q9.

A cylinder made of conducting putty has a fixed length. How will its resistance change if the thickness of the cylinder is increased?

1. The resistance will increase
2. The resistance will decrease
3. The resistance will remain the same
4. The resistance will depend on the type of conducting putty used

Q10.

In a parallel circuit, the total current is:

1. Less than the smallest individual current
2. Equal to the largest individual current
3. The sum of the individual currents
4. The reciprocal of the sum of the reciprocals of the individual currents

Subject: Physics

Level: Beginner