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Unit 15: Electrostatics

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Question 1 of 20 0% read

1. Electrical breakdown in gases produces:

A Heat only

B Light only

C Spark or discharge

D Sound only

2. Gold leaves are used in an electroscope because they are:

A Heavy

B Elastic

C Good conductors

D Magnetic

3. Which application uses corona discharge?

A Photocopiers

B Electric heaters

C Motors

D Generators

4. Which condition favors electrical breakdown?

A Low electric field

B High electric field

C Low temperature

D Low charge

5. Electric field inside a conductor is:

A Maximum

B Minimum

C Zero

D Infinite

6. Like charges:

A Attract each other

B Repel each other

C Remain neutral

D Disappear

7. Charging by conduction requires:

A Contact between bodies

B No contact

C Insulators

D Vacuum

8. Which statement is correct?

A Charge can be created

B Charge can be destroyed

C Charge is conserved

D Charge depends on mass

9. Which object cannot be charged easily?

A Metal rod

B Plastic rod

C Glass rod

D Rubber rod

10. Charging a body without touching it is called:

A Charging by friction

B Charging by conduction

C Charging by induction

D Charging by earthing

11. Charging by friction involves:

A Movement of protons

B Movement of neutrons

C Transfer of electrons

D Creation of charges

12. Electrical breakdown of air occurs when:

A Air becomes cold

B Electric field exceeds a critical value

C Humidity increases

D Pressure decreases

13. Which device protects buildings from lightning?

A Transformer

B Lightning rod

C Fuse

D Circuit breaker

14. An electroscope can be used to determine:

A Amount of current

B Type of charge

C Resistance

D Voltage

15. Divergence of gold leaves indicates:

A No charge

B Presence of charge

C Loss of charge

D Magnetic effect

16. What is an electric field?

A Region of magnetic force

B Region around a charge where force is felt

C Flow of electrons

D Electric current

17. Earthing helps to:

A Store charge

B Increase charge

C Remove excess charge

D Create new charge

18. Which law explains force between charges?

A Ohm’s law

B Faraday’s law

C Coulomb’s law

D Newton’s law

19. Electric field lines end on:

A Positive charges

B Neutral bodies

C Negative charges

D Conductors

20. Electric field lines start from:

A Negative charges

B Positive charges

C Neutral bodies

D Earth

Unit 15: Electrostatics

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