12th physics chapter 9 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 9 full solution |
| content | physics objective type MCQ question with answer |
| name of subjects | class 12 physics |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th physics chapter 9 all objective solutions – download PDF
1. For a total internal reflection, which of the following is correct?
-
- (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
12th physics chapter 9 bihar board
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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Bihar board 12th science stream subjects wise solution
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| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |