Applied Electricity Mock 2024

Question 1 of 50

A diode allows current to flow

Question 2 of 50

An LED emits light when it is

Question 3 of 50

In a three-pin plug wired to the IEC colour code, the earth wire is

Question 4 of 50

The first action when someone receives an electric shock is to

Question 5 of 50

The unit of electric charge is the

Question 6 of 50

Potential difference is measured with a

Question 7 of 50

1 milliampere equals

Question 8 of 50

In a series circuit, the current is

Question 9 of 50

The frequency of an a.c. supply with period 0.02 s is

Question 10 of 50

Impedance is measured in

Question 11 of 50

The process of adding impurities to pure silicon is

Question 12 of 50

A light-dependent resistor has

Question 13 of 50

Before working on a circuit you should

Question 14 of 50

The colour of the live wire in the IEC code is

Question 15 of 50

Energy used by a 1.5 kW heater in 4 hours is

Question 16 of 50

A charge of 30 C passes a point in 15 s. The current is

Question 17 of 50

Two 10 Ω resistors in parallel give

Question 18 of 50

An open circuit has

Question 19 of 50

The opposition of a capacitor to alternating current is

Question 20 of 50

A switch should always be connected in the

Question 21 of 50

Conductance is the reciprocal of

Question 22 of 50

The resistivity of a material depends on

Question 23 of 50

Resistors of 3 Ω and 6 Ω in parallel have a combined resistance of

Question 24 of 50

A potential divider with 2 kΩ and 8 kΩ across 10 V gives a voltage across the 8 kΩ resistor of

Question 25 of 50

The internal resistance of a cell causes its terminal voltage to

Question 26 of 50

The rule used to find the direction of induced current in a generator is

Question 27 of 50

Copper losses in a transformer are caused by

Question 28 of 50

The peak value of a 230 V r.m.s. supply is about

Question 29 of 50

The power factor of a purely resistive circuit is

Question 30 of 50

A forward-biased silicon diode has a voltage drop of about

Question 31 of 50

A transistor used as an amplifier

Question 32 of 50

An earth leakage circuit breaker protects people from

Question 33 of 50

The output voltage of a generator increases with

Question 34 of 50

The efficiency of a transformer with 960 W output and 1,000 W input is

Question 35 of 50

Inductive reactance is measured in

Question 36 of 50

Three 3 Ω resistors in series with a 9 V supply carry a current of

Question 37 of 50

A 240 V, 960 W kettle draws a current of

Question 38 of 50

The direction of force on a current-carrying conductor in a magnetic field is given by

Question 39 of 50

The period of a 50 Hz supply is

Question 40 of 50

A p–n junction diode conducts when it is

Question 41 of 50

A transistor has three terminals: emitter, base and

Question 42 of 50

In a three-pin plug, the green and yellow wire is the

Question 43 of 50

1 kilowatt-hour equals

Question 44 of 50

A 4 Ω and a 12 Ω resistor in parallel have equivalent resistance

Question 45 of 50

The fuse rating most suitable for a 240 V, 2.4 kW heater is

Question 46 of 50

Laminating a transformer core reduces

Question 47 of 50

The commutator in a d.c. motor

Question 48 of 50

The r.m.s. value of an a.c. with peak 100 V is about

Question 49 of 50

Inductive reactance increases when frequency

Question 50 of 50

In a purely capacitive circuit, current