12th physics chapter 9: full solution, notes, MCQ, & free PDF | Bihar board

Physics class 12
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12th physics chapter 9 Bihar board with NCERT-Details & Highlights

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12th physics chapter 9 all objective solutions – download PDF

1. For a total internal reflection, which of the following is correct?

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    • (a) Light travels from rarer to denser medium.
    • (b) Light travels from denser to rarer medium.
    • (c) Light travels in air only.
    • (d) Light travels in water only.

Answer: (b) Light travels from denser to rarer medium.

2. Critical angle of glass is θ2and that of water is θ2. The critical angle for water and glass surface would be (μg = 3/2, μw = 4/3).

    • (a) less than θ2
    • (b) between θ1 and θ2
    • (c) greater than θ2
    • (d) less than θ1

Answer: (c) greater than θ2

3. Mirage is a phenomenon due to

    • (a) refraction of light
    • (b) reflection of light
    • (c) total internal reflection of light
    • (d) diffraction of light.

Answer: (c) total internal reflection of light

4. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

    • (a) become zero
    • (b) become infinite
    • (c) become small, but non-zero
    • (d) remain unchanged

Answer: (b) become infinite

5. Which of the following forms a virtual and erect image for all positions of the object?

    • (a) Concave lens
    • (b) Concave mirror
    • (d) Convex mirror
    • (d) Both (a) and (c)

Answer: (d) Both (a) and (c)

6. Two lenses of focal lengths 20 cm and – 40 cm are held in contact. The image of an object at infinity will be formed by the combination at

    • (a) 10 cm
    • (b) 20 cm
    • (c) 40 cm
    • (d) infinity

Answer: (c) 40 cm

7. Two beams of red and violet color are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be

    • (a) 30° for both the colors
    • (b) greater for the violet color
    • (c) greater for the red color
    • (d) equal but not 30° for both the colors

Answer: (a) 30° for both the colors

8. Which of the following colours of white light deviated most when passes through a prism?

    • (a) Red light
    • (b) Violet light
    • (c) Yellow light
    • (d) Both (a) and (b)

Answer: (b) Violet light

9. An under-water swimmer cannot see very clearly even in absolutely clear water because of

    • (a) absorption of light in water
    • (b) scattering of light in water
    • (c) reduction of speed of light in water
    • (d) change in the focal length of eye lens

Answer: (d) change in the focal length of eye lens

10. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then

    • (a) the magnification is 1000
    • (b) the length of the telescope tube is 20.02 m
    • (c) the image formed of inverted
    • (d) all of these

Answer: (d) all of these

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11. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 ’em in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is

    • (a) 10 cm
    • (b) 15 cm
    • (c) 2.5 cm
    • (d) 5 cm

Answer: (d) 5 cm

12. Optical fibers communication is based on which of the following phenomena?

    • (A) Total internal reflection
    • (B) Scattering
    • (C) Diffraction
    • (D) Refraction

Answer: (A) Total internal reflection

13. To get three images of a single object, one should place two plane mirrors at an angle of ……

    • (A) 60°
    • (B) 90°
    • (C) 120°
    • (D) 30°

Answer: (B) 90°

14. In which mirror the image of an object always appears diminished and virtual?

    • (A) Plane
    • (B) Convex
    • (C) Concave
    • (D) None of these

Answer: (B) Convex

15. With an increase in wavelength the refractive index: 

    • (A) Decreases
    • (B) Increases
    • (C) Remains unaffected
    • (D) None of these

Answer: (A) Decreases

16. An object is placed between two plane mirrors inclined to each other at an angle of 60° The maximum number of images seen will be :

    • (A) 2
    • (B) 3
    • (C) 5
    • (D) 6

Answer: (C) 5 

17. For which of the following pairs is the critical angle the smallest :

    • (A) Water-air
    • (B) Glass-water
    • (C) Glass-air
    • (D) Glass-Glass

Answer: (C) Glass-air 

18. When light enters glass from air, its wavelength : 

    • (A) Increases
    • (B) Decreases
    • (C) Remains unchanged
    • (D) None of these

Answer: (B) Decreases

19. Two lenses of power -1.5 D and +2.5 D are placed in contact. The focal length of combination will be :

    • (A) 1 m
    • (B) 5 m
    • (C) 10 m
    • (D) 20 m

Answer: (A) 1 m 

20. The length of an astronomical telescope is 16 cm and its magnifying power is 3. The focal length of the lenses will be :

    • (A) 4 cm, 12 cm
    • (B) 4 cm, 8 cm
    • (C) 4 cm,2 cm
    • (D) 8 cm, 4 cm

Answer: (A) 4 cm, 12 cm

bihar board 12th physics chapter 9 mcq solution

21. A spherical mirror is immersed in water, its focal length will 

    • (A) Increase
    • (B) Decrease
    • (C) Remain constant
    • (D) None of these

Answer: (C) Remain constant

22. A ray of light goes from glass (refractive index=5/3) to water (4/3). The critical angle will be :

    • (A) sin-1(1/2)
    • (B) sin-1(4/5)
    • (C) sin-1(5/6)
    • (D) None of these

Answer: (B) sin-1(4/5)

23. A thin prism (refractive index = 3/2) in air is immersed in a liquid of refractive index 5/4. The ratio of angle of deviations in the two cases will be:

    • (A) 15/8
    • (B) 8/15
    • (C) 5/2
    • (D) 2/5

Answer: (C) 5/2 

24. The refractive index of the material of an equilateral prism is √3. The angle of minimum deviation for the prism is :

    • (A) 30°
    • (B) 37°
    • (C) 45°
    • (D) 60°

Answer: (D) 60° 

25. Which colour of light has a shortest wavelength ? 

    • (A) red
    • (B) yellow
    • (C) blue
    • (D) violet

Answer: (D) violet

26. For which colour of ray the refractive index of glass is largest ? 

    • (A) red
    • (B) yellow
    • (C) blue
    • (d) violet

Answer: (d) violet

27. Which colour of light has longest wavelength ? 

    • (A) red
    • (B) yellow
    • (C) blue
    • (D) violet

Answer: (A) red

28. The component of white light that suffers the smallest deviation when passed through a glass prism is 

    • (A) red
    • (B) violet
    • (C) green
    • (D) yellow

Answer: (A) red

29. The power of a convex lens (refractive index 1.50) when immersed in water (refractive index 1.33)

    • (A) increases
    • (B) decreases
    • (C) remains unchanged
    • (D) None of these

Answer: (B) decreases 

30. As the wavelength is increased, the value of the refractive index of glass

    • (A) increases
    • (B) decreases
    • (C) remains the same
    • (D) None of these

Answer: (B) decreases

bseb solution 12th physics chapter 9 answer key

31. If there are two lenses of powers 2 diopters and 3.5 diopters in contact, the power of the combination will be 

    • (A) +1 D
    • (B) -1.5 D
    • (C) 2D
    • (D) -3.5 D

Answer: (B) -1.5 D

32. The ray of light does not deviate when it 

    • (A) reflects from a plane mirror normally
    • (B) reflects from a plane mirror obliquely
    • (C) passes through a prism
    • (D) passes through a slab by refracting at parallel interfaces of slabe

Answer: (D) passes through a slab by refracting at parallel interfaces of slabe 

33. The unit of power of a lens is 

    • (A) lambda
    • (B) candela
    • (C) diopter
    • (D) watt

Answer: (C) diopter

34. The power of a convex lens of focal length 10cm will be 

    • (A) -10 D
    • (B) +10 D
    • (C) 95D
    • (D) +5 D

Answer: (B) +10 D

35. Mostly colour-blind eyes cannot distinguish between 

    • (A) red and blue
    • (B) blue and green
    • (C) red and green
    • (D) red and yellow

Answer: (C) red and green

36. When a red flower’ is viewed through a green glass, it appears

    • (A) red
    • (B) green
    • (C) yellow
    • (D) black

Answer: (D) black

37. If the distance between an object and its real image formed in a convex lens is 4f, the magnitude of magnification of the image is

    • (A) less than one
    • (B) equal to one
    • (C) more than one
    • (D) zero

Answer: (B) equal to one

38. A biconvex lens can form virtual image if the object lies 

    • (A) between the lens and its focus
    • (B) at the focus
    • (C) between f and 2f
    • (D) at infinity

Answer: (A) between the lens and its focus

39. A parallel beam of rays strikes the plane surface of a thin planoconvex lens giving focal length f. If the lens be inverted, the focal length will be

    • (A) greater
    • (B) smaller
    • (C) of the same value
    • (D) zero

Answer: (C) of the same value

40. An object lies at 10 cm from a convex mirror of curvature radius 20 cm. The image distance is 

    • (A) 20 cm
    • (B) 40 cm
    • (C) 5 cm
    • (D) infinite

Answer: (C) 5 cm

bihar board mcq solution 12th physics chapter 9

41. When concave lens of glass is immersed in water, it becomes

    • (A) less convergent
    • (B) convergent
    • (C) less divergent
    • (D) more divergent

Answer: (C) less divergent

42. If the focal length of a lens is 20cm, its power will be 

    • (A) 5 diopter
    • (B) 20 diopter
    • (C) 0.5 diopter
    • (D) 0.05 diopter

Answer: (A) 5 diopter 

43. If the power of a lens is +1D, its focal length will be 

    • (A) 1 meter
    • (B) 0,5 meter
    • (C) 2 meter
    • (D) 1.5 meter

Answer: (A) 1 meter 

44. When two converging lenses of same focal length fare placed in contact, then the focal length of the combination is

    • (A) f
    • (1) 2f
    • (C) f / 2
    • (D) 3f

Answer: (C) f / 2

45. A biconvex lens of air bubble in water will behave in the same way as a

    • (A) converging lens
    • (B) diverging lens
    • (C) glass slab
    • (D) concave mirror

Answer: (B) diverging lens

46. Two convex lenses are in contact. The equivalent lens is 

    • (A) convex
    • (B) concave
    • (C) planoconcave
    • (D) cylindrical

Answer: (A) convex 

47. The optical fibre works on the principle of 

    • (A) Scattering
    • (B) Refraction
    • (C) Dispersion
    • (D) Total internal reflection

Answer: (D) Total internal reflection 

48. A convex lens of focal length 40 cm is in contact with a convex lens of focal length 25 cm. The power of the combination is 

    • (A) -1.5 D
    • (B) -6.5 D
    • (C) +6.5 D
    • (D) +5.6 D

Answer: (D) +5.6 D

49. A coloured image is formed when white rays pass through a thick lens because of

    • (A) reflection of light
    • (B) refraction of light
    • (C) chromatic aberration
    • (D) spherical aberration

Answer: (C) chromatic aberration

50. The equivalent focal length of the combination of two lenses with powers -15D and +5D is

    • (A) -10 cm
    • (B) -20 cm
    • (C) +10 cm
    • (D) None of these

Answer: (A) -10 cm 

51. Which has larger difference in focal length ? 

    • (A) in telescope
    • (B) compound microscope
    • (C) in both
    • (D) None of these

Answer: (A) in telescope

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