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NDA GK Previous Papers Chapterwise MCQs - Optics
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NDA GK Previous Papers Chapterwise MCQs - Optics
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25 Questions

1. Concave mirror is used in headlights of vehicles, because it
2. If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what will be the ratio of velocity of light in glass and water?
3. An object placed 10 cm in front of a convex lens of focal length 15 cm. The image produced will be
4. Rays of light get refracted while passing from air to glass because
5. Light waves projected on oil surface show seven colours due to the phenomenon of
6. In optical instruments, the lenses are used to form image by the phenomenon of
7. A ray of light falls on a transparent glass plate. A part of it is reflected and a part is refracted. The reflected and refracted rays can be perpendicular to each other for
8. Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror?
9. Which one of the following statements is correct about the magnification of an optical microscope?
10. How far must a girl stand in front of a concave spherical mirror of radius 120 cm to see an erect image of her face four times its natural size?
11. The human eye is like a camera and hence it contains a system of lens. The eye lens forms
12. To obtain the powerful parallel beams of light from a vehicle's headlight, one must use
13. Which one of the following is used to remove Astigmatism for a human eye?
14. Consider the following statements:
1. The focal length of the objective of a microscope is less than the focal length of the eyepiece.
2. The minimum distance between an object and its real image formed by a convex lens of focal length f is equal to 4 f.
15. Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length
16. In vacuum, the speed of light
17. The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for
18.
In the figure shown above, L1 and L2 are two lenses and are kept along the same axis. A parallel beam of light falling on L1 leaves L2 as a parallel beam: Consider the following statements.
1. Both L1 and L2 can be convex lenses.
2. The distance between the two lenses can be equal to sum of their focal lengths. Which of the statements given above is/are correct ?
19.
In the figure shown μl, μ2, μ3, μ4 and μ5 are the refractive indices of the mediums 1, 2, 3, 4 and 5 respectively. Consider the following:
1. μl = μ2 2. μ3= μ4 = μ5
3. μ2 < μ3 4. μ4 > μ5 Which of the above are correct ?
20. Consider the following statements: A real image
1. can be formed on a screen
2. is always magnified and inverted Which of the statements given above is/are correct?
21. Consider the following statement: The principle of total internal reflection is applicable to explain the
1. Formation of mirage in desert.
2. Formation of image in microscope.
3. Colour of evening sky.
4. Operation of optical fibres. Which of the statement given above are correct?
22. Consider the following statements : Hypermetropia is a defect of vision in which
1. a person cannot see the distant objects clearly
2. a person cannot see the near objects clearly
3. the near point of the eye gets shifted away from the normal position
4. the far point of the eye gets shifted towards the eye Which of the statements given above are correct?
23. What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as ?
24. Which one of the following statements about the refractive index of a material medium with respect to air is correct?
25. An object is placed at the focus of a concave mirror. The image will be

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