School Quizzes

Maharashtra State Board School Quizzes

Quiz on Electric Current (General Science)

Vincent Augustine D'Souza

Standard Eight Science

1. Why is the direction of the current in an electric motor reversed after every half round?

To stop electric motor from heating.
It makes electric motor strong.
Otherwise the armature in electric motor will stop rotating.
It increases the speed.
Correct Answer: Otherwise the armature in electric motor will stop rotating.

2. How can the strength of an electro-magnet be increased?

By adding coal.
By using stronger currents.
By keeping in a cool place.
By making it hot.
Correct Answer: By using stronger currents.

3. What is the principle of an electric motor?

Higher you rise, faster you fall.
An object moves at constant velocity unless stopped.
Danger increased with higher voltage.
Setting an armature in motion by sending an electric current through it.
Correct Answer: Setting an armature in motion by sending an electric current through it.

4. Why is there a key in an electrical circuit?

To open and close the circuit.
To explain electrical terms.
To give directions.
To prevent hacking.
Correct Answer: To open and close the circuit.

5. Why in an electric bell, the electric currents stop again and again?

Bells are not strong.
Bells are of wood.
It loses power repeatedly.
It has make and break arrangement.
Correct Answer: It has make and break arrangement.

6. Why are electrical switches made of plastic?

Plastic is cheap.
Plastic is not conductor of electricity.
Plastic is strong.
Plastic is durable.
Correct Answer: Plastic is not conductor of electricity.

7. When was the Leclanche cell made?

1866
1772
1848
1900
Correct Answer: 1866

8. Which cell is also called lithium cell?

Volta cell
Leclanche cell
button cell
nickel-cadmium cell
Correct Answer: button cell

9. Who gets the credit for the experiment of electro-magnetic induction?

Thomas Alva Edison
Michael Faraday
Georges Leclanche
Alessandro Volta
Correct Answer: Michael Faraday

10. What gives protection from electrical current?

Armature
Carbon
Insulator
Zinc
Correct Answer: Insulator

Originally posted 2015-11-24 11:17:55.