# 8th Class Science Light Question Bank

### done Light

• A) Rough surface

B) Ideal surface

C) Smooth surface

D) Smooth but curved surface

• A) Silver

B) Copper

C) Aluminium

D) Platinum

• A) The absorption of light by objects

B) The reflected light from the object

C) The total internal reflection taking place in an object

D) The refracted light from the object

• A) Reflection

B) Refraction

C) Dispersion

D) Splitting

• A) Incident ray

B) Reflected ray

C) Normal

D) Image

• A) A single image

B) Two images

C) Infinite number of images

D) Zero image

• A) ${{80}^{\text{o}}}$

B) ${{100}^{\text{o}}}$

C) ${{160}^{\text{o}}}$

D) ${{20}^{\text{o}}}$

• A) Convex mirror

B) Convex lens

C) Plane mirror

D) Concave mirror

• A) 5

B) 6

C) 7

D) 8

• A) ${{50}^{\text{o}}}$

B) ${{100}^{\text{o}}}$

C) ${{130}^{\text{o}}}$

D) ${{80}^{\text{o}}}$

• A) Convex mirror

B) Concave mirror

C) Convex lens

D) Plane mirror

• A) The angle of incidence is twice the angle of reflection.

B) The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane.

C) Some virtual images can be caught on the screen.

D) A convex mirror forms a real image.

• A) The right side of the object will be on the right side of the image.

B) The left side of the object will be on the left side of the image.

C) The top of the object will be the bottom of the object.

D) The right side of the object will be on the left side of the image.

• A) Perpendicular to each other

B) Parallel to each other

C) At an angle of ${{90}^{\text{o}}}$

D) At an angle of ${{60}^{\text{o}}}$

• A) Virtual and erect

B) Virtual and inverted

C) Real and erect

D) Real and inverted

• A) 1/1 0th of a second

B) 1/12th of a second

C) 1/16th of a second

D) 1/20th of a second

•  (i) Eye sight becomes foggy (ii) Eye lens becomes cloudy (iii) There is a loss of vision
In which of the following are the above characteristics observed?

A) Myopia

B) Presbyopia

C) Hypermetropia

D) Cataract

• A) Large cornea

B) Large pupil

C) Retina with large number of rods

D) All of the above

• A) ${{60}^{\text{o}}}$

B) ${{90}^{\text{o}}}$

C) ${{80}^{\text{o}}}$

D) ${{40}^{\text{o}}}$

• A) M

B) N

C) O

D) P

• A) Periscope

B) Kaleidoscope

C) Shaving mirrors

• A) 4 m

B) 3.5 m

C) 9 m

D) 5 m

• A) 11

B) 5

C) 8

D) 9

• A) ${{65}^{\text{o}}}$

B) ${{90}^{\text{o}}}$

C) ${{130}^{\text{o}}}$

D) 25

• A) When raindrops absorb sunlight

B) When raindrops reflect sunlight

C) When raindrops disperse sunlight

D) When raindrops diffract sunlight

• A) S

B) T

C) L

D) P

• A) It absorbs all the amount of light incident on it.

B) It refracts all the light.

C) It reflects all the light.

D) All of the above

• A) Periscope

B) Kaleidoscope

C) Telescope

D) Thermoscope

• A) The eye can focus on very rapidly changing pictures.

B) The eye is quicker than the brain.

C) The eye can separate two images only when the interval of separation between them is one-sixteenth of a second.

D) The optical cortex can see through the rapidly moving images.

• A) Iris

B) Pupil

C) Choroid

D) Blind spot

• A) 5 to 8 cm

B) 10 to 15 cm

C) 20 to 25 cm

D) 30 to 35 cm

• A) Iris

B) Pupil

C) Cornea

D) Retina

• A) Real, upright and enlarged

B) Real, upright and diminished

C) Real, inverted and diminished

D) Virtual, inverted and diminished

• A) The eye ball is shortened.

B) Ciliary muscles contract.

C) The eye ball elongates.

D) The retina expands.