Unit 14: Optics + Unit 15: Electrostatics

1

Which phenomenon explains the formation of a rainbow?

A Reflection only B Refraction only C Dispersion and total internal reflection D Diffraction

2

What is static electricity?

A Electricity due to moving charges B Electricity produced by batteries C Electricity due to stationary charges D Electricity flowing in circuits

3

Electric field inside a conductor is:

A Maximum B Minimum C Zero D Infinite

4

The bending of light around sharp edges is called:

A Reflection B Refraction C Diffraction D Dispersion

5

Which defect of vision occurs in old age due to loss of lens elasticity?

A Myopia B Hypermetropia C Presbyopia D Astigmatism

6

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

7

Divergence of gold leaves indicates:

A No charge B Presence of charge C Loss of charge D Magnetic effect

8

Electrostatic force is:

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

9

Which application uses corona discharge?

A Photocopiers B Electric heaters C Motors D Generators

10

Which of the following is a conductor?

A Glass B Plastic C Rubber D Copper

11

Charging a body without touching it is called:

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

12

The angle between the incident ray and the normal is called:

A Angle of reflection B Angle of deviation C Angle of incidence D Critical angle

13

An electroscope can be used to determine:

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

14

Color blindness is mainly due to defect in:

A Rods B Cones C Cornea D Lens

15

What happens during discharging?

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

16

Like charges:

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

17

Total internal reflection occurs when light travels from:

A Denser to rarer medium B Rarer to denser medium C Vacuum to air D Air to glass only

18

Acoustic lenses are mainly used in:

A Photography B Medical ultrasonography C Optical microscopes D Astronomy

19

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

20

Snell’s law relates the angles of incidence and refraction with:

A Speed of light B Wavelength of light C Refractive indices D Intensity of light

21

Hypermetropia is corrected using:

A Concave lens B Convex lens C Plane mirror D Prism

22

A lens with focal length 0.5 m has power:

A 0.5 D B 2 D C –2 D D –0.5 D

23

The phenomenon of bending of light when it passes from one medium to another is called:

A Reflection B Diffraction C Refraction D Dispersion

24

Which condition favors electrical breakdown?

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

25

Earthing helps to:

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