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Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 1 (25 MCQs)

Quiz Instructions

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1. Magnifying power of a concave lens is
2. The magnification of an object placed 10 cm from a convex mirror of radius of curvature 20 cm will be-
3. Image formed by plane mirror is
4. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. then the position of the object should be-
5. Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be:(a) plane (b) concave (c) convex (d) either concave or convex
6. Which of the following best models how light is reflected?
7. When does the light is refracted?
8. Light travels through a liquid at 2.25 x 10$^{8}$ m/s. What is the absolute refractive index of the liquid?
9. Linear magnification produced by a concave mirror may be:(a) less than 1 or equal to 1 (b) more than 1 or equal to 1 (c) less than 1, more than 1 or equal to 1 (d) less than 1 or more than 1
10. In optics an object which has higher refractive index is called
11. Density is .....
12. When a ray of light travelling in glass enters into water obliquely:(a) it is refracted towards the normal (b) it is not refracted at all (c) it goes along the normal (d) it is refracted away from the normal
13. Assertion:The twinkling of star is due to reflection of light. Reason:The velocity of light changes while going from one medium to the other.
14. You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most
15. Explain why a pencil appears bent when placed in a glass of water.
16. Magnification produced by a rear view mirror fitted in vehicles
17. A lens of focal length 12 cm forms an erect image, three times the size of the object. The object distance from measured from the optical centre will be
18. A light ray falls on a mirror and deviates by 60$^\circ$ then the angle of reflection will be
19. The refractive index of dens flint glass is 1.65 and for alcohol, it is 1.36 with respect to air, then the refractive index of the dens flint glass with respect to alcohol is
20. If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:
21. If the magnification produced by a lens has a negative value, the image will be
22. Which of the following can form a virtual image which is always smaller than the object? (a) a plane mirror (b) a convex lens (c) a concave lens (d) a concave mirror
23. The magnification produced by a concave mirror-
24. When parallel rays are incident on a concave mirror on reflection they meet at the
25. If the image is formed in front of the mirror, then the image distance will be
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