U3
1.The muscular diaphragm that controls the size of the pupil is
(a) cornea
(b) ciliary muscles
(c) iris
(d) retina
AE3
2. Having two eyes facilitates in
A : Increasing the field of view
B : Bringing three-dimensional view
C : Developing the concept of distance/ size
Then the correct option is/are
(a) A only
(b) A and B only
(c) B only
(d) A, B and C
R3
3. The black opening between the aqueous humour and the lens is called
(a) retina
(b) iris
(c) cornea
(d) pupil
R4
4. Near and far points of a young person normal eye respectively are
(a) 0 and infinity
(b) 0 and 25 cm
(c) 25 cm and infinity
(d) 25 cm and 150 cm.
R3
5. The defect of vision in which the person is able to see distant object distinctly
but cannot see nearby objects clearly is called
(a) Long-sightedness
(b) Far-sightedness
(c) Hypermetropia
(d) All above
U3
6. The ability of eye lens to adjust its focal length to form a sharp image of the
object at varying distances on the retina is called
(a) Power of observation of the eye
(b) Power of adjustment of the eye
(c) Power of accommodation of the eye
(d) Power of enabling of the eye
U2
7. Myopia and hypermetropia can be corrected by
(a) Concave and plano-convex lens
(b) Concave and convex lens
(c) Convex and concave lens
(d) Plano-concave lens for both defects.
U2
8. Bi-focal lens are required to correct
(a) astigmatism
(b) coma
(c) myopia
(d) presbyopia
A3
9. The defective eye of a person has near point 0.5 m and point 3 m. The power
far corrective lens required for
(i) reading purpose and
(ii) seeing distant objects, respectively are:
(a) 0.5 D and +3D
(b) +2D and – 13 D
(c) – 2D and + 13D
(d) 0.5 D and-3.0 D
U3
10. The image formed on the retina of the human eye is
(a) virtual and inverted
(b) real and inverted
(c) real and erect
(d) virtual and erect
U3
11. When white light enters a prism, it gets split into its constituent colours.
This is due to
(a) different refractive index for different wavelength of each colour
(b) each colours has same velocity in the prism.
(c) prism material have high density.
(d) Scattering of light
U3
12.The air layer of atmosphere whose temperature is less then the hot layer
behave as optically
(a) denser medium
(b) rarer medium
(c) inactive medium
(d) either denser or rarer medium
U2
13. Refraction of light by the earth’s atmosphere due to variation in air density
is called
(a) atmospheric reflection
(b) atmospheric dispersion
(c) atmospheric scattering
(d) atmospheric refraction
R3
14. The deflection of light by minute particles and molecules of the atmosphere
in all direction is called ____________ of light.
(a) dispersion
(b) scattering
(c) interference
(d) tyndell effect
U2
15. One cannot see through the fog, because
(a) refractive index of the fog is very high
(b) light suffers total reflection at droplets
(c) fog absorbs light
(d) light is scattered by the droplets
A2
16.A person cannot see distinctly objects kept beyond 2 m. This defect can be
corrected by using a lens of power
(a) + 0.5 D
(b) – 0.5 D
(c) + 0.2 D
(d) – 0.2 D
AE4
17.A prism ABC (with BC as base) is placed in different orientations. A narrow
beam of white light is incident on the prism as shown in figure. In which of the
following cases, after dispersion, the third colour from the top corresponds to
the colour of the sky?
U3
18. At noon the sun appears white as
(a) light is least scattered
(b) all the colours of the white light are scattered away
(c) blue colour is scattered the most
(d) red colour is scattered the most
U3
19. Twinkling of stars is due to atmospheric
(a) dispersion of light by water droplets
(b) refraction of light by different layers of varying refractive indices
(c) scattering of light by dust particles
(d) internal reflection of light by clouds.
U3
20.The clear sky appears blue because
(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
