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Class 8

Explore popular questions from Light for Class 8. This collection covers Light previous year Class 8 questions hand picked by experienced teachers.

Light

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Q 1. A smooth shining surface,which rebounds the light back in same or in different direction is called

a mirror

B

a lens

C

reflection of light

D

point of incidence

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Q 2. Beam of light striking the reflecting surface is called

A

reflecting ray

incident ray

C

refracted ray

D

normal ray

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Q 3. Band of seven colours is called

A

VIBGYOR

spectrum

C

dispersion

D

reflection

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Q 4. Front bulged part of the eyeball is called

cornea

B

choroid

C

pupil

D

retina

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Q 5. Image formed by mirrors are

A

real only

B

virtual only

both real and virtual

D

neither real nor virtual

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Q 6. In case of reflection of light, the angle of incidence (i) and the angle of reflection (r) are related as

i = r

B

i < r

C

i > r

D

no definite relation

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Q 7. Name the type of mirror used as a back view mirror.

A

Plane mirror

B

Concave mirror

Convex mirror

D

Any of these

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Q 8. Visually impaired people can read and write using

A

electronic writer

B

digital pens

braille system

D

hearing aids

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Q 9. The image formed by a camera and a simple microscope are respectively

A

real and real

real and virtual

C

virtual and virtual

D

virtual and real

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Q 10. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray ?

A

60°

45°

C

90°

D

180°

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Q 11. The splitting of white tight into its seven constituent colours is called

A

refraction

dispersion

C

deviation

D

reflection

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Q 12. The defect due to which a person is not able to see the distant objects clearly :

Myopia

B

Hypermetropia

C

Cornea

D

Cataract

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Q 13. The amount of light entering the eye is controlled by

A

eye lens

B

cornea

iris

D

ciliary muscle

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Q 14. Myopia can be corrected by using a

concave lens

B

convex lens

C

opaque lens

D

micro lens

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Q 15. Light enters the eye through

A

eye lens

B

pupil

cornea

D

retina

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Q 16. Light causes the sensation of

Vision

B

Light

C

Both (A) and (B)

D

None

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Q 17. When a part of the incident light is returned back into the same medium, it is called :

A

Refraction

Reflection

C

Both

D

Absorption

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Q 18. The branch of physics where light and its phenomena are studied is called :

Optics

B

Acoustics

C

Mechanics

D

None

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Q 19. Light is

an electromagnetic radiation

B

a longitudinal wave

C

massless

D

all of the above

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Q 20. Which of the followingis a natural luminous source of light ?

Sunlight

B

Wood

C

Electric lamp

D

Torch light

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Q 21. Which of the following is not a translucent object ?

A

Greased paper

B

Paraffin wax

C

Froasted glass

Water

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Q 22. Light shows :

A

Random propagation

B

Curvilinear propagation

Rectilinear propagation

D

None of these

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Q 23. Which of the following is a reflector of light ?

A

Sun

B

Star

C

Filament

Moon

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Q 24. Wood is an example of :

A

Translucent

B

Transparent

C

Polymer

Opaque