1. What is the unit of electric current?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: b) Ampere
2. Which component in a household electrical circuit is used to prevent overloads by breaking the circuit?
a) Transformer
b) Circuit Breaker
c) Resistor
d) Capacitor
Answer: b) Circuit Breaker
3. What is the primary function of a transformer in an electrical system?
a) To store electrical energy
b) To convert AC to DC
c) To change the voltage of the electricity
d) To regulate the current flow
Answer: c) To change the voltage of the electricity
4. Which of the following materials is a good conductor of electricity?
a) Plastic
b) Glass
c) Copper
d) Wood
Answer: c) Copper
5. In which direction do electrons flow in a conventional current?
a) From positive to negative
b) From negative to positive
c) From the ground to the source
d) Randomly
Answer: b) From negative to positive
6. What is the unit of electrical resistance?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: c) Ohm
7. What device is commonly used to measure electric current in a circuit?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Wattmeter
Answer: b) Ammeter
8. What is the primary source of magnetism in most materials?
a) The movement of protons
b) The alignment of electrons’ magnetic moments
c) The interaction of neutrons
d) The electric fields
Answer: b) The alignment of electrons’ magnetic moments
9. What type of magnet is a permanent magnet?
a) Electromagnet
b) Temporary magnet
c) Temporary magnet
d) Soft magnet
Answer: c) Permanent magnet
10. What happens to the magnetic field strength of an electromagnet as the current increases?
a) It decreases
b) It remains the same
c) It fluctuates
d) It increases
Answer: d) It increases
11. What is the function of an insulator in a household electrical system?
a) To increase current flow
b) To convert electrical energy to heat
c) To prevent electrical current from escaping
d) To amplify the electrical signal
Answer: c) To prevent electrical current from escaping
12. What is the name of the force that causes a compass needle to point towards the Earth’s magnetic poles?
a) Electromagnetic Force
b) Gravitational Force
c) Magnetic Force
d) Nuclear Force
Answer: c) Magnetic Force
13. What is the unit of electric power?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: d) Watt
14. Which of the following is NOT a property of a magnet?
a) Attracts iron
b) Has north and south poles
c) Attracts wood
d) Can repel other magnets
Answer: c) Attracts wood
15. How is the resistance of a wire affected by its length?
a) Resistance decreases as length increases
b) Resistance remains constant regardless of length
c) Resistance increases as length increases
d) Resistance decreases as length decreases
Answer: c) Resistance increases as length increases