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AP Polycet (Polytechnic) 2021 Previous Question Paper with Answers And Model Papers With Complete Analysis

81) Which of the following is not an example of refraction

A) bottom of the swimming pool with water appears to be raised

B) pencil placed in a tumbler of water appears to have a bent

C) lemon kept in a glass of water appears to be bigger than its size

D) appearance of our image in a plane mirror

View Answer

D) appearance of our image in a plane mirror

82) The speed of light in benzene is 2×10⁸ m/s. Its refractive index is (speed of light in vacuum =3×10⁸m/s)

A) 0.66

B) 1

C) 1.5

D) 2

View Answer

C) 1.5
Explanation:To find the refractive index $n$ , use the shortcut formula:
$n = \frac{\text{Speed of light in vacuum}}{\text{Speed of light in medium}}$
Step-by-step shortcut:
$n = \frac{3 × 10^8}{2 × 10^8} = 1.5$
Final Answer: 1.5

83) A light ray travels from air to glass with an angle of incidence of 45°. The possible angle of refraction is

A) 45°

B) 65°

C) 90°

D) 30°

View Answer

D) 30°

84) According to laws of refraction, which of the following lie in the same plane

A) incident and refracted rays

B) incident ray, refracted ray and normal

C) incident ray and normal only

D) refracted ray and normal only

View Answer

B) incident ray, refracted ray and normal

85) A focal plane is

A) parallel to the principal axis

B) perpendicular to the principal ais

C) at 45° to the principal axis

D) at 60° to the principal axis

View Answer

B) perpendicular to the principal ais

86) Which of the following lens is used as magnifying lens

A) double convex

B) double concave

C) plano-convex

D) plano-concave

View Answer

A) double convex

87) A convex lens gives an image of the same size of the object when the object is placed

A) between the focal point and centre of curvature

B) between the focal point and the optic centre

C) beyond the centre of curvature

D) at the centre of curvature

View Answer

D) at the centre of curvature

88) Pick the correct answer from the following two statements:
A) a lens has at least one curved surface
B) a plano-concave lens has two curved surfaces

A) only A. is true

B) only B. is true

C) both A. and B. are true

D) both A. and B. are false

View Answer

A) only A. is true

89) The materials suitable for making heating element of electric iron is

A) copper

B) nichrome

C) silver

D) germanium

View Answer

B) nichrome

90) Match the following:

Physical quantity	SI unit
i)Electric current	A) coulomb
ii)Electric charge	B) volt
iii) Electric potential	C) ampere

A) (i)-C, (ii)-A, (iii)-B

B) (i)-C, (ii)-B, (iii)-A

C) (i)-A, (ii)-C, (iii)-B

D) (i)-B, (ii)-A, (iii)-C

View Answer

A) (i)-C, (ii)-A, (iii)-B

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