Question 1

1. What is dispersion?

Accepted Answer

a) White light splitting into its constituent colors

Answer

b) Leaving

Answer

d) None of the above

Answer

c) the band of colors seen on a screen

Question 2

2. Which of these is correctly arranged in increasing order of their wavelength?

Accepted Answer

b) Gamma rays, x-rays, UV rays, visible light,infrared rays, microwaves, radio waves

Answer

a) Gamma rays, UV rays, x-rays, Infrared rays,visible light, radio waves, microwaves

Answer

c) UV rays, microwaves, gamma rays, visiblelight, x-rays, radio waves, infrared rays

Answer

d) Gamma rays, infrared rays, UV rays, x- rays,radio waves, microwaves, visible light

Question 3

3. Which of these is NOT a property common to all electromagnetic waves?

Accepted Answer

d) They are longitudinal in nature

Answer

c) They exhibit properties of reflection andrefractio

Answer

a) They are not deflected by electric or magneticfields

Answer

They do not require a medium to propagate

Question 4

4. Which of the following is NOT a property of UV rays?

Accepted Answer

a) They don't affect photographic plate

Answer

c) They are absorbed by glass

Answer

b) They produce fluorescence on striking a zincsulfide screen

Answer

d) They are scattered by dust present in the atmosphere

Question 5

5. Which of these is NOT a use of UV rays?

Accepted Answer

d) night photography

Answer

c) Producing vitamin D in food of plants and animals

Answer

b) Sterilizing air, surgical equipment, etc.

Answer

a) Detecting purity of gems, eggs, ghee, etc

Question 6

6. Which of the following is NOT a property of infrared rays?

Accepted Answer

d) They are absorbed by rock salt

Answer

c) They are detected by their heating property

Answer

a) They do not affect photographic film

Answer

b) Greenhouse gases in the atmosphere absorblow-energy infrared radiation and keep Earth'ssurface warm

Question 7

7. Which of the following is NOT a use of infrared rays?

Accepted Answer

b) Sterilizing surgical equipment

Answer

d) Therapeutic purposes

Answer

c) remote control

Answer

a) Signals during war

Question 8

8. The refractive index of glass___ with ___ in wavelength of light.

Accepted Answer

d) Increases, decrease

Answer

c) No change

Answer

a) Increases, increase

Answer

b) Decreases, increase

Question 9

9. Total Angle of Deviation does not depend on ______

Accepted Answer

d) frequency

Answer

b) Refractive Index

Answer

a) Angle of Prism

Answer

c) Angle of Incidence

Question 10

10. Which colour of Light travel fastest?

Accepted Answer

d) Red

Answer

c) Violet

Answer

a) Green

Answer

b) Yellow

Question 11

If the wavelength of Red light is 800 nm. Find its frequency ( C= )a) b)c) d)3 × 108sm

Accepted Answer

3.75 × 10 Hz.14

Answer

3.75 × 10 Hz.12

Answer

3.40 × 10 Hz.14

Answer

3.60 × 10 Hz.14

Question 12

In the spectrum of white light by a prism, the color at the extreme end opposite to the base of prismis

Accepted Answer

d) Red

Answer

b) Blue

Answer

a) Yellow

Answer

c) Violet

Question 13

13. Calculate the frequency of Indigo color if wavelenth is 450 nm

Accepted Answer

6.66 × 10 Hz.14

Answer

a)7.5 × 10 Hz.14

Answer

5.66 × 10 Hz.14

Answer

6.06 × 10 Hz.14

Question 14

Which colour of light scatter most from the following ?( Blue, Indigo, Green, Yellow

Accepted Answer

indigo

Answer

green

Answer

yellow

Answer

Blue

Question 15

An electromagnetic wave has a frequency of 500 MHz and wavelength of 60 cm. Calculate thespeed of wave

Accepted Answer

a)3 10 m/s

Answer

d)4 10 m/s× 8 × 7× 8

Answer

C) 3 10 km/s

Answer

b)2 10 m/s

Question 16

What would be the size of smallest particle that scatter the light ?

Accepted Answer

d) 400 nm

Answer

a) 800 nm

Answer

b) 900 nm

Answer

c) 600 nm

Question 17

Why the danger signal is in red colour ?

Accepted Answer

d) Because Red Scatter Least

Answer

Because Red scatter Most

Answer

c) Because Red has least wavelenght

Answer

b) Because Red Deviate Most

Question 18

18. Which one of the light is used in remote control devices at home ?

Accepted Answer

a) Infrared

Answer

b) Ulta Violet

Answer

c) Radio Waves

Answer

d) Microwave

Question 19

Which of the following radiation produces a strong heating effect?

Accepted Answer

C) Infrared Radiotion

Answer

d) X- Ray Radiation

Answer

b) Visible Light Radiation

Answer

a) Ultra violet Radiation

Question 20

Which of the following radiation produces a strong heating effect?

Accepted Answer

b) Infrared Radiotion

Answer

d) Visible Light Radiation

Answer

c) Ultra violet Radiation

Answer

a) X- Ray Radiation

Question 21

21. Which of The wave is used in RADAR?

Accepted Answer

c) Radio Waves

Answer

b) Microwave

Answer

A) X- Ray

Answer

d) Visible Light

Question 22

When a white light ray falls on a prism. the ray at its first surface suffers :

Accepted Answer

c) Both Deviation and Dispersion

Answer

b) Only Dispersion

Answer

a) No Refraction

Answer

d) Only Deviation

Question 23

The Frequency range of visible light is fromm 3.75 × 10 Hz14 7.5 × to . Calculate thewavelength range? ( Take Speed of light in Air )

Accepted Answer

d) 400 nm to 800 nm

Answer

a) 500 nm to 578 nm

Answer

b) 400 nm to 440 nm

Answer

c) 590 nm to 800 nm

Question 24

If an object is placed at a distance of 10 cm in front of a plane mirror how far would it be from its image.

Accepted Answer

c) 20cm

Answer

a) 30cm

Answer

d) 10cm

Answer

b) 40cm

Question 25

25. Real image is always

Accepted Answer

b) Inverted

Answer

a) Virtual

Answer

d) Real

Answer

c) Erect

Question 26

Which type of image formed by plane mirror?

Accepted Answer

a) All of the above

Answer

b) Erect

Answer

d) Virtual

Answer

c) Same size

Question 27

27. A ray of light is incident on a plane mirror at an angle of 30°.what is the angle of refrection?

Accepted Answer

d) 30°

Answer

c) 20°

Answer

b) 40°

Answer

a) 10°

Question 28

28. When an obj is placed at focus then which type of image is formed?

Accepted Answer

a) Both (1)and (3)

Answer

c) Real

Answer

b) Inverted

Answer

d) Virtual

Question 29

29. Which mirror has a wider field of view?

Accepted Answer

a) Convex

Answer

c) Concave

Answer

b) Plane

Question 30

30. When light is available which image is formed.

Accepted Answer

c) Real

Answer

b) Virtua

Answer

a) Erect

Question 31

31. Which section of the spectrum is the ONLY one we can see?

Accepted Answer

d) Visible Light

Answer

b) Gamma Rays

Answer

a) Ultraviolet Rays

Answer

c) X-rays

Question 32

Which of the following is correct?

Accepted Answer

c) Incident ray, reflected ray and normal areequal

Answer

a) Angle of incidence is equal to angle ofreflection is equal to normal

Answer

b) All of the above

Answer

d) Incident ray, reflected ray and normal lie on the same plane

Question 33

The power of a convex lens is 10 dioptre. Its focal length will be---------cm.

Accepted Answer

10

Answer

20

Answer

5

Answer

15

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