Unit 15: Electrostatics

1

Static charges are produced mainly by:

A Chemical reactions B Friction C Heating D Radiation

2

Which of the following is a conductor?

A Glass B Plastic C Rubber D Copper

3

An electroscope can be used to determine:

A Amount of current B Type of charge C Resistance D Voltage

4

Which gas is commonly used in fluorescent tubes?

A Oxygen B Nitrogen C Neon D Carbon dioxide

5

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

6

Electrical breakdown in gases produces:

A Heat only B Light only C Spark or discharge D Sound only

7

Charging a body without touching it is called:

A Charging by friction B Charging by conduction C Charging by induction D Charging by earthing

8

Electrostatic force is:

A Always attractive B Always repulsive C Can be attractive or repulsive D Always zero

9

Electric field lines end on:

A Positive charges B Neutral bodies C Negative charges D Conductors

10

Which device protects buildings from lightning?

A Transformer B Lightning rod C Fuse D Circuit breaker

11

Electric field lines never:

A Cross each other B Start from charges C End on charges D Exist in space

12

Electric field inside a conductor is:

A Maximum B Minimum C Zero D Infinite

13

Which law explains force between charges?

A Ohm’s law B Faraday’s law C Coulomb’s law D Newton’s law

14

Which condition favors electrical breakdown?

A Low electric field B High electric field C Low temperature D Low charge

15

Like charges:

A Attract each other B Repel each other C Remain neutral D Disappear

16

Which particle is responsible for electric charge?

A Proton B Neutron C Electron D Photon

17

Corona discharge occurs when:

A Field is very weak B Field is slightly below breakdown value C Field is zero D No charge is present

18

Which device is used to detect electric charge?

A Voltmeter B Ammeter C Galvanometer D Electroscope

19

Which application uses electrostatics?

A Electric motor B Photocopier C Transformer D Generator

20

Charging by friction involves:

A Movement of protons B Movement of neutrons C Transfer of electrons D Creation of charges

21

Charging by conduction requires:

A Contact between bodies B No contact C Insulators D Vacuum

22

What happens during discharging?

A Charge increases B Charge remains constant C Charge flows away D New charge is produced

23

Electric field lines start from:

A Negative charges B Positive charges C Neutral bodies D Earth

24

Gold leaves are used in an electroscope because they are:

A Heavy B Elastic C Good conductors D Magnetic

25

Earthing helps to:

A Store charge B Increase charge C Remove excess charge D Create new charge