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TG EAMCET (EAPCET) Physics Multiple Choice Questions (MCQs)

TG EAMCET MCQs - Physics

TG EAMCET Physics MCQs (71-80)

71. Which of the following is the correct sign convention for the focal length of a concave mirror?

a) Positive for concave and negative for convex
b) Negative for concave and positive for convex
c) Always positive
d) Always negative

Answer: b) Negative for concave and positive for convex

72. The mirror equation is given by:

a) 1/f = 1/v + 1/u
b) f = v/u
c) f = u/v
d) v = u/f

Answer: a) 1/f = 1/v + 1/u

73. Total internal reflection occurs when:

a) The angle of incidence is greater than the critical angle
b) The angle of incidence is less than the critical angle
c) The refractive index of the second medium is greater
d) Light is passing from a less dense medium to a denser medium

Answer: a) The angle of incidence is greater than the critical angle

74. Which phenomenon explains the formation of a rainbow?

a) Refraction
b) Dispersion
c) Diffraction
d) Reflection

Answer: b) Dispersion

75. What is the power of a lens if its focal length is 20 cm?

a) 5 diopters
b) 0.05 diopters
c) 20 diopters
d) 0.2 diopters

Answer: a) 5 diopters

76. Which optical instrument is used to view very small objects clearly?

a) Simple microscope
b) Compound microscope
c) Telescope
d) Camera

Answer: b) Compound microscope

77. The principle of total internal reflection is used in which of the following devices?

a) Simple microscope
b) Optical fibers
c) Telescope
d) Camera

Answer: b) Optical fibers

78. What does the resolving power of an optical instrument depend on?

a) Wavelength of light used
b) Focal length of the lens
c) Aperture size of the lens
d) Both a and c

Answer: d) Both a and c

79. The condition for constructive interference in Young's double-slit experiment is:

a) d sin θ = (n + 1/2)λ
b) d sin θ = nλ
c) d sin θ = (n - 1/2)λ
d) d sin θ = λ

Answer: b) d sin θ = nλ

80. What is the effect of passing light through a polarizer?

a) It reduces the intensity of light
b) It converts unpolarized light into polarized light
c) It refracts light
d) It causes interference

Answer: b) It converts unpolarized light into polarized light

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