WorksheetsTopical Test : Electricity & Magnetism
Total questions: 20
Worksheet time: 10mins
Which of the following are renewable energy sources?
Hydro energy, solar energy, wind energy and nuclear energy
Solar energy, biomass energy, wave energy and nuclear energy
Geothermal energy, tidal energy, biomass energy and wind energy
Nuclear energy, solar energy, petroleum and natural gas
Which of the following uses alternating current?
Calculator
Torch
Toy car
hair dryer
Which power station uses firewood as the energy source ?
Nuclear
Biomass
Thermal
Hydroelectric
Which of the following power station uses non-renewable energy sources ?
Hydroelectric power station
Thermal power station
Biomass power station
Wind energy power station
The information below shows examples of a non-renewable energy source of energy. Uranium,Plutonium. What is the name of this source of energy?
Fossil fuels
Nuclear energy
Biomass
Geothermal energy
Which of the following generators does not use a turbine to produce electricity?
Nuclear generators
Diesel generators
Hydroelectric generators
Thermal generators
What is the use of a transformer?
Change a direct current into an alternating current
Change the voltage of an alternating current
Change the amount of current flowing in a circuit
Change the resistance of an appliance
According to the National Grid Network, what is the function of the last transformer?
Helps to increase the voltage
Change the voltage of an alternating current
Helps to change the voltage to current
Helps to decrease the voltage
Which statement is true about alternating current?
Electric current with fixed direction of flow
Electric current that flows in one direction only
Electric current that flows in two opposite directions
Electric current that flows in constantly reversing directions
Which of the following are the functions of switch zone? I enables electricity to be sent to the power station
II enables electricity to be sent to the National Grid Network
III enable specific power stations and grids to be closed for maintenance works
IV enable electricity to be sent to the branch substation
I and II
I and III
II and III
III and IV
Which of the following statement explains the step-up transformer correctly?
The primary coil has more turns of wire
Secondary coil has less turns of wire
Primary coil has less turns of wire
Secondary coil has the same number of turns of wire as the primary coil
Which of the following electrical appliances uses a transformer?
Toaster
Laptop battery charger
Inscandescent lamp
Toy car
Diagram 1 shows the circuit diagram of the transformer in a mobile phone charger. Calculate number of turns in the primary coil.
Number Primary = ?
Voltage Primary = 240V
Number secondary = 10
Voltage Secondary = 5
24
48
120
480
Diagram 2 shows the system of electricity supply from the power station to consumers. What is the function of transformer P ?
Power Station (12Kv) - Transformer P - National Grid Network
To flow the same value of voltage of alternating current
To increase the voltage of alternating current
To decrease the voltage of alternating current
To automatically disconnect the voltage of alternating current
Diagram 3 shows a 3-pin plug on an iron. What is the function of wire P ?
upper middle wire (earth wire)
Carries electric current from the substation to the house
Allows the electric current to flow back to the substation
Breaks the circuit whwn the current exceeds the limit
Allows the leaked current to flow to the earth
Diagram 4 shows the distribution system of electricity with four tansformers, P,Q, R and S.
Power Station - P - (Q - R 240V) - (Q - S 415V)
Which transformers P,Q, R and S are step-down transformer?
P, R and S only
P and Q only
P, Q and S only
Q, R and S only
Pak Ali built a house for his family. When fixing the electrical wires and cables, he neglected the earth wire. What is the consequence of this neglect?
Power supply will always break down
The value of input voltage will become lower
The electric bill will become higher
The household appliances will become damaged when lighting
Which fuse is suitable for a heater with the power of 1500 W that uses 240 V supply?
Fuse 3 A
Fuse 5 A
Fuse 10 A
Fuse 13 A
Zahid is conducting an activity to generate electricity by using the apparatus as shown in the diagram below. What should be done by Zahid to produce electric current?
I Moves the copper rod
II Moves the magnet
III Moves the galvanometer
IV Replaces the copper rod with a wooden ruler
I and II
I and IV
II and IV
III and IV
The diagram below shows a transformer connected to a 5 volt power supply. Predict the value of the output voltage of the transformer.
Number Primary = 8
Number Secondary = 5
5 V
7 V
less than 5 V
More than 5 V
