1)

The muscular diaphragm that controls the size of the pupil is
 

Class 10 Physics

A)

cornea

B)

ciliary muscles

C)

retina

D)

iris

2)

The black opening between the aqueous humour and the lens is called

Class 10 Physics

A)

retina

B)

Iris

C)

cornea

D)

Pupil

3)

Near and far points of a young person normal eye respectively are

Class 10 Physics

A)

0 and infinity

B)

0 and 25 cm

C)

25 cm and infinity

D)

25 cm and 150 cm.

4)

The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called

Class 10 Physics

A)

Long-sightedness

B)

 Far-sightedness

C)

Hypermetropia

D)

All above

5)

Myopia and hypermetropia can be corrected by

Class 10 Physics

A)

Concave and plano-convex lens

B)

Concave and convex lens

C)

Convex and concave lens

D)

Plano-concave lens for both defects.

6)

 Bi-focal lens are required to correct

Class 10 Physics

A)

astigmatism

B)

coma

C)

myopia

D)

presbyopia

7)

The image formed on the retina of the human eye is

Class 10 Physics

A)

virtual and inverted

B)

real and inverted

C)

 real and erect

D)

 virtual and erect

8)

The clear sky appears blue because

Class 10 Physics

A)

 blue light gets absorbed in the atmosphere.

B)

ultraviolet radiations are absorbed in the atmosphere.

C)

violet and blue lights get scattered more than lights of all other colours by the atmosphere.

D)

light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

9)

When light rays enter the eye, most of the refraction occurs at the

Class 10 Physics

A)

crystalline lens

B)

outer surface of the cornea

C)

iris

D)

pupil