NDA/NA Examination
NDA Solved Papers
NDA/NA 2023 - II Solved Paper NDA/NA 2023 - I Solved Paper NDA/NA 2022 - II Solved Paper NDA/NA 2022 - I Solved Paper NDA/NA 2021 - II Solved PaperQuestions on Light, Lenses and Mirrors
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NDA/NA 2023 - II Exam
1. The streaming of light beams coming from the Sun through trees is said to have suggested that light travels in straight line. The particles on the path of light beams are visible to us because
- dust particles in the air reflect light into our eyes
- dust particles in the air scatter light into our eyes
- dust particles in the air refract light into our eyes
- dust particles in the air polarize light into our eyes
2. The flash of lightning is seen before the thunderstorm is heard. It verifies that
- sound travels much faster than light
- light travels much faster than sound
- light and sound both travel with same speed
- intensity of flash of lightning is very high during thunderstorm
3. Sita, 1.5 m high, stands before a plane mirror fixed on a wall to view her full image. What should be the minimum height of the plane mirror so that Sita can view her image fully?
- 0.50 m
- 0.35 m
- 0.75 m
- 0.25 m
4. Ramesh cannot see distinctly objects kept beyond 2 m. The defect can be correct by using a lens of power
- + 0.5 D
- - 0.5 D
- + 0.2 D
- - 0.2 D
5. Which one of the following optical phenomena supports that the light is a transverse wave?
- Refraction
- Diffraction
- Interference
- Polarization
NDA/NA 2023 - I Exam
6. A rectangle ABCD is kept in front of a concave mirror of focal length f with its corners A and B being, respectively, at distances 2f and 3f from the mirror with AB along the principal axis as shown in the figure. It forms an image A'B'C'D' in front of the mirror. What is the ration of B'C' to A'D'?
- 1
- 2
- 1/2
- 2/3
7. Shown in the figure are two plane mirrors XY and YZ (XY is perpendicular to YZ) joined at their edge. Also shown is a light ray falling on one of the mirrors and reflected back parallel to its original path as a result of this arrangement. The two mirrors are now rotated by an angle θ to their new position X'YZ', as shown. As a result the new reflected ray is at an angle α from the original reflected ray. Then:
- α = 0
- α = θ
- α = 2θ
- α = 4θ
8. In the disperson of white light by a common glass prism, which one among the following is correct?
- Red light deviates the most because red light has highest speed in prism
- Blue light deviates the most because blue light has highest speed in prism
- Red light deviates the most because red light has lowest speed in prism
- Blue light deviates the most because blue light has lowest speed in prism
9. Which one of the following telescopes contains only mirrors?
- Galilean telescope
- Keplerian telescope
- Newtonian telescope
- Schmidt telescope
NDA/NA 2022 - II
10. Human eye can see objects at different distances with contrasting illuminations. This is due to
- far-sightedness
- near-sightedness
- far-sightedness and near-sightedness
- accommodation of eye
11. Two convex lenses have focal lengths of 50 cm and 25 cm, respectively. If these two lenses are placed in contact, then the net power of this combination will be equal to
- +2 dioptre
- +6 dioptre
- -6 dioptre
- +3 dioptre
12. The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to
- (3/2)c
- (4/9)c
- (2/3)c
- (9/4)c
NDA/NA 2022 - I
13. The twinkling of a star is due to the atmospheric
- diffraction of starlight
- reflection of starlight
- refraction of starlight
- dispersion of starlight
14. What is the magnification produced by a concave lens of focal length 10 cm, when an image is formed at a distance of 5 cm from the lens?
- 2.0
- 1.0
- 0.5
- 0.33
NDA 2021 - II
15. Myopia is a defect in human vision where and image of a
- nearby object is focused beyond the retina
- nearby object is focused before the retina
- distant object is focused before the retina
- distant object is focused beyond the retina
16. Tyndall effect is a phenomenon of
- scattering of light by the colloidal particles.
- refraction of light by the colloidal particles.
- dispersion of light by dust particles.
- refraction of light by dust particles.
17. Twinkling of stars is primarily due to the atmospheric
- refraction
- reflection
- polarization
- dispersion
18. Cornea in human eye
- is a light sensitive screen.
- is a muscular diaphragm.
- contains blood vessels.
- is composed of proteins and cells.
19. Power of a lens of focal length 25 cm is
- +2.5 Dioptre
- +3 Dioptre
- +4 Dioptre
- +5 Dioptre
20. Spherical mirror formula relating an object distance 'u', image distance 'v' and focal length of mirror 'f' may be applied to a plane mirror when
- focal length goes to infinity.
- focal length goes to zero.
- image distance goes to zero.
- image distance goes to infinity.
21. Which one of the following figures correctly shows the path of a ray of light through a glass prism?
22. When a light beam falls on a triangular glass prism, a band of colours is obtained. Which one of the following statements is correct in this regard?
- Red light bends the most, as the refractive index of glass for red light is greatest.
- Red light bends the most, as the refractive index of glass for red light is lowest.
- Violet light bends the most, as the refractive index of glass for violet light is greatest.
- Violet light bends the most, as the refractive index of glass for violet light is lowest.
23. The image of an object formed by a plane mirror is
- erest, real and larger.
- erect, virtual and same size.
- inverted, virtual and same size.
- inverted, real and smaller.