WorksheetsMock exam 33 questions electrical science
Total questions: 33
Worksheet time: 55mins
Which one of the following does NOT conduct electricity?
Brass
Glass
Aluminium
Copper
Which of the following makes use of the magnetic effect of an electric current?
Bimetal strip
Electric Doorbell
Car battery
Storage heater
The meter used in an electrical installation for recording the energy used is called?
a power meter
A Wattmeter
an ammeter
a kilowatt hour meter
What is the Quantity symbol for Impedance?
Z
A
I
V
What value of resistance is required to have a current of 12A, from a supply of 230v?
1320A
19.17Ω
19.17A
1320Ω
A series circuit consists of three resistors with values of 100Ω, 250Ω and 350Ω. The total resistance is?
70Ω
59Ω
550Ω
700Ω
The magnetic effect of an electric current is put to use in a?
Solenoid
Heating clement
Fuse
Battery
If a lever has a fulcrum is at one end and the load is in the middle but nearer to the fulcrum it is known as a?
Class 2 Lever
Class 1 Lever
Class 3 Lever
Universal Lever
An Electric storage heater uses the heating method of?
Immersion
Radiation
Convection
conduction
If a lever has a fulcrum in the middle between the force and load it is known as a?
Universal Lever
Class 1 Lever
Class 2 Lever
Class 3 Lever
Given the formula: Force (Newtons) = Mass (kg) x acceleration (m/s) 2 a body is accelerated at 2 m/sec when a force of 10 Newtons is applied to is the mass of the body will be:
5Kg
20Kg
10Kg
2Kg
Which of the following statements regarding molecular structure is true?
All atoms have odd numbers of electrons, protons and nuclear
All atoms are made up of a combination of electrons, protons and a nucleus
All atoms have the same number of electrons
All atoms have more than one electron
A resistor network with three resistors 9Ω, 3Ω, 2Ω are connected in parallel. What will their combined resistance be?
6Ω
24Ω
18Ω
1.05Ω
What is the current of a circuit with 110 voltage and resistance of 12Amps?
The voltage of the alternator is shown in the form of a?
Waveform pattern
Sinusoidal diagram
Waveform diagram
Sinusoidal waveform
Calculate the resistance of a resistor which absorbs 5000W when a current of 15A passes through it?
75000Ω
230V
22.22Ω
333.33Ω
Which of the following statements describes the frequency of a waveform?
The number of cycles per second
The time taken for one cycle
The maximum peak period
The time from one peak to the next
Which is not an expression of 1 micrometer?
0.000001m
1µm
1x10-6m
1000000m
Which two values of a right-angled triangle are used to calculate the tangent of an angle?
Opp and Hyp
Adj and Hyp
Right angle and Opp
Adj and Opp
Can you draw a simple one way lighting circuit?
Which of the following statements is not true?
Work done is equal to force x distance
Watts is equal to amps/volts
Energy used is equal to work done
Power is the rate at which energy is converted
A cooker has 4 x 1.5 kW hot plates, a 2 kW grill and a 3.5 kW oven. If the cooker is supplied from a 230 V ac supply, what is the maximum current drawn by the cooker?
32.8A
30.4A
50A
70A
What is the value of I2?
What is the SI unit of measurement symbol for Luminous intensity?
s
Kg
Cd
Wb
What is the SI unit of measurement symbol for Magnetic flux?
s
Kg
Cd
Wb
Which of the following electronic components are used to control or reduce current flow?
Diac
Diode
Thyristor
Resistor
Which of the electronic components has three terminals called the base and collector and emitter?
Diac
Diode
Triac
Transistor
A 12V battery is connected across a set of resistors in series, values being, 60Ω, 30Ω, 100 Ω and 45Ω. The current flowing in the circuit is?
0.51mA
51mA
5.1A
51A
Can you draw a ring main circuit with 4 socket outlets?
A length of copper wire has a resistance of 5Ω. What would be the resistance if the length of wire were halved and the cross sectional area doubled?
2.5Ω
1.25Ω
10Ω
5Ω
A device consists of soft iron bar with a single coil of insulated wire wound on it. When a current flows in the coil the device acts as?
A generator
A transformer
An Electromagnet
A rectifier
If a motor’s input is 75 Watts and it’s output is 50 Watts, what is the efficiency of the motor?
50%
33.30%
150%
66.60%
Can you draw a radial socket circuit with a fused spur powering a light?
