Multiple choice quiz: Fundamentals

An alternating current has a frequency of 2 kHz. Which one of the following gives the time for one complete cycle?

(a) 0.5 ms
(b) 1 ms
(c) 2 ms

Potential difference is measured in:

(a) amps
(b) ohms
(c) volts

How many radians are there in 360°?

(a) 2
(b) π
(c) 2π

A current of 2 A flows in a resistor of 6 Ω. Which one of the following gives the potential difference that appears across the resistor?

(a) 0.33 V
(b) 3 V
(c) 12 V

An electric field will appear between the plates of a capacitor when:

(a) the plates are shorted together
(b) the plates are connected to a battery
(c) the plates are connected to a lamp

The prefix n is equivalent to a multiplier of:

(a) 10^-6
(b) 10^-9
(c) 10^-12

A battery of 24 V is connected across an unknown resistance. If a current of 0.5 A is supplied, which one of the following gives the value of the resistor?

(a) 6 Ω
(b) 12 Ω
(c) 48 Ω

A solenoid consists of turns of wire wound on an iron core. The strength of the magnetic flux produced in the core depends:

(a) only on the number of turns
(b) only on the current flowing in the wire
(c) on the product of the number of turns and the current flowing

The prefix m is used to denote:

(a) mega
(b) micro
(c) milli

Provided temperature does not vary, Ohm's Law states that:

(a) the product of potential difference to current flowing will be constant
(b) the ratio of potential difference to current flowing will be constant
(c) the sum of potential difference and current flowing will be constant

The peak value of an alternating voltage is 100 V. Which one of the following gives the average value of the voltage measured over one complete cycle?

(a) 0 V
(b) 50 V
(c) 100 V

In electrical circuits energy can be supplied by:

(a) resistors and capacitors
(b) capacitors and inductors
(c) batteries and generators

Electric current is measured in:

(a) amps
(b) ohms
(c) volts

Which one of the following gives the units of electric charge?

(a) Coulomb
(b) Joule
(c) Farad

Electromotive force (e.m.f.) is provided by:

(a) a battery
(b) a lamp
(c) a resistor

In terms of the fundamental SI units, which one of the following gives the units of electric charge?

(a) Ampere seconds (A s)
(b) Amperes per second (A s^-1)
(c) Seconds per ampere (s A^-1)

The prefix k is equivalent to a multiplier of:

(a) 10²
(b) 10³
(c) 10⁶

Which one of the following is TRUE?

(a) like charges repel one another
(b) unlike charges repel one another
(c) no force exists between charges of either polarity

Which one of the following gives the units of electric power?

(a) Joule
(b) Volt
(c) Watt

The symbol L is used to denote

(a) capacitance
(b) inductance
(c) loss

The symbol used to denote charge in an electrical circuit is:

(a) C
(b) E
(c) Q

An alternating current has 50 complete cycles in each second. Which one of the following gives the frequency of the current?

(a) 25 Hz
(b) 50 Hz
(c) 100 Hz

A magnetic field surrounding a wire can be detected by means of:

(a) a compass
(b) a lamp
(c) a voltmeter

One radian is approximately equal to:

(a) 57°
(b) 90°
(c) 180°

Electrons are:

(a) negative charge carriers orbiting the nucleus of an atom
(b) positive charge carriers orbiting the nucleus of an atom
(c) uncharged particles present in the nucleus of an atom