Class 8 Science:Light MCQs and one word answers

1. The most comfortable distance at which one can read with a normal eye is about :-

a. 20 cm

b. 22 cm

c. 25 cm

d. 30 cm
Ans:c

2. Impression of an image persists on retina for ab

out:-

a. 1/12 of a second

b. 1/16 of a second

c. 1/10 of a second

d. 1/15 of a second
Ans:b

3. The visually impaired can also read with fingers using a special alphabet called :-

a. Bralle

b. Brialle

c. Brallie

d. Braille
 Ans:d

4. Image formed on retina is/are :-

a. upside down

b. flat

c. reversed left to right

d. all the above
Ans;d

5.The amount of light that is reflected depends on :-
a. the material of the surface
b. the length of the surface
c. the nature of the surface
d. only a & c
Ans:d
6. Form of energy that gives us sensation of sight
 is :-
a. reflection
b. light
c. refraction
d. dispersion
Ans:b
7.Moon is a :-
a. non-luminous body
b. luminous body
c. semi-luminous body
d. black body
Ans:a

8.Which of the following is possible?
a. sunlight
b. moonlight
c. earthlight
d. all the above
Ans:d

9. What will be the angle of incidence if a ray of light is reflected back at an angle of 30:-

a. 60

b. 75

c. 30

d. 15

Ans:c

10. A person sees blurred images of all objects around him or her. That person is suffering from :-

a. myopia

b. hypermetropia

c. night blindness

d. cataract 

 Ans:d

11.The eye perceives an object as moving when images ar

e flashed on the eye at a rate :-

a. faster than 10 per second

b. slower than 10 per second

c. faster than 16 per second

d. slower than 16 per second
Ans:c

12. A triangular piece of glass that breaks up whit

e light into spectrum is :-

a. presm

b. prism

c. mirror

d. convex lens
Ans:b

 

One Word Question and Answers

a. ______ is the light sensitive area in the eye. (retina)
b. ______ spot is the area of no vision in eye. (Blind)
 c.Brain interprets image signals from both eyes to provide a ______ dimensional image. (Three)
d. Nerve fibres of rods and cones join to form ______ nerve (Optic)
e.Gives color to the eye (iris)
f.Outermost tough covering of eye (cornea)
g.Opening in the iris through which light enters (pupil)
f.Helps to focus the image (ciliary muscle)
g.Controls amount of light entering eye (iris)
i.Nerve cells sensitive to dim light (Rodes)
h.nerve cells senstive to bright light(cones)
j.junction between optic nerve and retina
(blind spot)