10th class Physics unit 3 MCQs
chapter 3 MCQs 10th Class Physics
Geometrical Optics:
1. Who presented the theory of light?
a. Maxwell
b. Newton
c. Bill
d. Faraday
2. Types of reflection are:
a. Four
b. Two
c. Five
d. Three
3. The laws of reflection are:
a. Four
b. Two
c. Five
d. Three
4. During reflection of light, the angle of incidence and mangle of reflection are:
a. Greater
b. Equal
c. Smaller
d. Unequal
5. The point where reflection occurs is called:
a. Point of concurrency
b. Point of reflection
c. Contact point
d. Point of incidence
6. The reflection from smooth surfaces is called:
a. Ideal reflection
b. Irregular reflection
c. Short reflection
d. Regular reflection
7. The reflection from rough surfaces is called:
a. Ideal reflection
b. Irregular reflection
c. Short reflection
d. long reflection
8. Nature of reflection depends upon ……… of the surface:
a. Deepness
b. Smoothness
c. Cold welds
d. Roughness
9. The equation of relation between focal length and radius of curvature is:
a. f = R2
b. f = R/2
c. f = 3R
d. f = 2R
10. The formula of focal length for spherical mirror:
a. f = R/3
b. f = R/2
c. f = R/5
d. f = R/4
11. Types of spherical mirrors are:
a. Six
b. Two
c. Eight
d. Four
12. Image formed by convex mirror is:
a. Erect and virtual
b. Erect and real
c. Inverted and virtual
d. Inverted and real
13. A spherical mirror is usually made of:
a. Wool
b. Plastic
c. Iron
d. Cotton
14. A spherical mirror whose inner curved surface is reflecting is called:
a. Diverging mirror
b. Convex mirror
c. Spherical mirror
d. Concave mirror
15. A spherical mirror whose outer curved surface is reflecting is called:
a. Converging mirror
b. Convex mirror
c. Spherical mirror
d. Concave mirror
16. Both virtual and real images can be formed by a …… mirror:
a. Diverging mirror
b. Convex mirror
c. Spherical mirror
d. Concave mirror
17. In convex mirror, the size of the image is always ……… than the object:
a. Equal
b. Greater
c. Same
d. Smaller
18. The erect image can be formed by a ……… mirror:
a. Converging mirror
b. Convex mirror
c. Spherical mirror
d. Concave mirror
19. The principle focus of a concave mirror is always:
a. Zero
b. Real
c. On the mirror
d. Virtual
20. The principle focus of a convex mirror is always:
a. Zero
b. Real
c. On the mirror
d. Virtual
21. A well polished spoon act as:
a. Concave mirror
b. Convex mirro
c. Both
d. None
22. A converging mirror with a radius of 20cm creates a real image 30cm from the mirror. What is the object distance?
a. -15cm
b. -5.0cm
c. -20cm
d. -7.5cm
23. An object is 14cm in front of a convex mirror. The image is 5.8cm behind the mirror what is the focal length of the mirror?
a. -9.9cm
b. -4.1cm
c. -20cm
d. -8.2cm
24. The mirror formula is:
a. 1/f=1/p+1/q
b. 1/p=1/f+1/q
c. 1/f=1/p-1/q
d. 1/q=1/p+1/f
25. Which of the following quantity does not change during refraction of light?
a. Its frequency
b. Its direction
c. Its wavelength
d. Its speed
26. The index of refraction depends upon
a. The image distance
b. The focal length
c. The object distance
d. The speed of light
27. The mathematical formula of Snell’s law is:
a. sini/sinr = n = n1/ n2
b. sini/Sinr = n = n2/ n1
c. cosi/cosr =n = n1/n2
d. sinr/sini = n = n1/ n2
28. Snell’s law is:
a. n = Sinr
b. n =sini/sinr
c. n = Sini
d. n = sinr/sini
29. Refractive index of air is:
a. 3
b. 1
c. 4
d. 2
30. Refractive index of diamond is:
a. 2.21
b. 1.33
c. 2.42
d. 1.52
31. Refractive index is equal to
a. n=v/c
b. n=c/v
c. n=1/cv
d. n = cv
32. The refractive index of ice is:
a. 2.42
b. 1.52
c. 1.33
d. 1.31
33. The refractive index of water is:
a. 1.39
b. 2.33
d. 1.31
d. 1.36
34. The speed of light in glass is:
a. 3 x 108ms-1
b. 2 x 108ms-1
c. 3 x 10-8ms-1
d. 2 x 10-8ms-1
35. The speed of light in water is:
a. 3 x 108ms-1
b. 2 .3 x 108ms-1
c. 3 .5 x 108ms-1
d. 2 .0 x 108ms-1
36. The refractive index of crown glass is:
a. 1.66
b. 2.42
c. 1.52
d. 2.21
37. The refractive index of ethyl alcohol is:
a. 1.31
b. 2.42
c. 1.36
d. 2.21
38. The bending of light passing from one medium to another medium is called:
a. Diffraction of light
b. Reflection of light
c. Endoscopy
d. Refraction of light
39. During refraction of light, the angle of incidence and angle of refraction are:
a. Same
b. Equal
c. Opposite
d. Unequal
40. The laws of refraction are:
a. Four
b. Two
c. Five
d. Three
41. The speed of light in air is:
a. 3 x 108ms-1
b. 3 x 106ms-1
c. 2 .3 x 108ms-1
d. 2 .0 x 108ms-1
42. The unit of refractive index is:
a. ms
b. ms-1
c. No unit
d. ms-2
43. Reflection of light and refraction of light are ……… quantities:
a. Have same units
b. Same
c. Different
d. None
44. If a ray of light in glass is incident on air surface at an angle greater than the critical angle, the ray will:
a. Partially refract and partially reflects
b. Refract only
c. Diffract only
d. Reflect only
45. The critical angle of water is:
a. 90o
b. 488o
c. 95o
d. 48.8o
46. The conditions of total internal reflection are:
a. Four
b. Two
c. Five
d. Three
47. Critical angle of glass is:
a. 90o
b. 42o
c. 0o
d. 45o
48. In total internal reflection, the light ray is totally:
a. Both
b. Reflected
c. Refracted
d. None
49. If a ray of light in glass is incident on an air surface at angle smaller than the critical angle, the ray will
a. Partially refract and partially reflects
b. Refract only
c. Diffract only
d. Reflect only
50. Such angle of incidence whose angle of reflection is equal to 90 is called:
a. Incidence angle
b. Critical angle
c. Reflecting angle
d. None
51. Optical fibers work on the principle of:
a. Total internal reflection
b. Refraction
c. Both A and B
d. Continues refraction
52. Endoscope which is used for the diagnose of throat is called:
a. Bronchoscope
b. Gastro scope
c. Bronchoscope
d. Cystoscope
53. Endoscope works on the principle of:
a. Laws of refraction
b. Total internal reflection
c. Optics
d. Laws of reflection
54. Endoscope which is used for the diagnose of bladder is called:
a. Bronchoscope
b. Gastro scope
c. Bronchoscope
d. Cystoscope
55. The totally internal reflecting prism reflect the beam of light through an angle of:
a. 180o
b. 90o
c. Both
d. 360o
56. Total layers of an optical fibre is:
a. Four
b. Two
c. Five
d. Three
57. The inner layer of optical fibre is called:
a. Cover
b. Core
c. Internal part
d. Cladding
58. The outer layer of optical fibre is called:
a. Cover
b. Core
c. External part
d. Cladding
59. Optical fibres are used in:
a. Transportation
b. Industry
c. In paper industry
d. Telecommuni
60. …… are used in binoculars:
a. Concave mirrors
b. Optical fibres
c. Totally internal reflecting prism
d. Convex mirrors
61. Endoscope which is used for the diagnose of stomach is called:
a. Bronchoscope
b. Gastro scope
c. Cystoscope
d. None of the above
62. Prism is made of:
a. Optical glass
b. Plastic
c. Cotton
d. Glass
64. The types of lenses are:
a. Four
b. Two
c. Five
d. Three
65. The purpose of lenses is:
a. Total internal reflection
b. Reflection
c. Refraction
d. None
66. Which of the following is an application of lenses?
a. Microscope
b. Camera
c. Telescope All
d. All
67. The lens which causes the rays of light to diverge is called:
a. Converging lens
b. Concave lens
c. Convex lens
d. None
68. The lens which causes the rays of light to converge is called:
a. Diverging lens
b. Concave lens
c. Convex lens
d. None
69. The focus of concave lens is:
a. Inverted
b. Real
c. Diminished
d. Virtual
70. The focus of convex lens is:
a. Inverted
b. Real
c. Diminished
d. Virtual
71. The SI unit of power of a lens is:
a. Candela
b. Meter
c. Mole
d. Dioptres
72. Which type of image is formed by convex lens on a screen?
a. Upright and real
b. Inverted and real
c. Upright and virtual
d. Inverted and virtual
73. Focal length of concave lens is:
a. Greater
b. Positive
c. Less
d. Negative
74. Focal length of convex lens is:
a. Greater
b. Positive
c. Less
d. Negative
75. The lens formula is:
a. 1/f=1/p+1/q
b. 1/p=1/f+1/q
c. 1/f= 1/p-1/q
d. 1/q=1/p+1/f
76. Image formed by a camera is
a. Virtual, upright, and diminished
b. Real, inverted, and diminished
c. Real, inverted and magnified
d. Virtual, upright and diminished
77. Which type of image is formed by the converging lens of human eye if it views distant objects?
a. Virtual, erect, diminished
b. Real, erect, same size
c. Virtual, inverted, magnified
d. Real, inverted, diminished
78. The human eye consists of:
a. Convex mirror
b. Concave lens
c. Concave mirror
d. Convex lens
79. The change in focal length of human eye is called:
a. Accommodation
b. Modification
c. Near sightedness
d. Distinct vision
80. The near point of a normal eye is:
a. 30 cm
b. 20 cm
c. 15 cm
d. 25 cm
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