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

81) Conductivity=

A) Resistance^-1
B) Current^-1
C) Potential^-1
D) Resistivity^-1

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D) Resistivity^-1

Explanation:Conductivity = D. Resistivity^-1
(Conductivity (σ) is the reciprocal of resistivity (ρ), i.e., ( $\sigma = \frac{1}{\rho}$ ).)

82) Least distance of distinct vision is ……

A) 25 m
B) 25 mm
C) 25 cm
D) 25 km

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C) 25 cm

Explanation:Least distance of distinct vision is …… 25 cm
(The least distance of distinct vision for a normal human eye is about 25 cm, the closest distance at which an object can be seen clearly.)

83) The resistance of human body varies between

A) 100Ω to 50,000Ω
B) 1000Ω to 5,000Ω
C) 1,000 Ω to 5,00,000 Ω
D) 100Ω to 5,00,000Ω

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D) 100Ω to 5,00,000Ω

Explanation:Human body resistance varies widely depending on conditions: 100Ω to 500,000Ω
Answer: 100Ω to 5,00,000Ω

84) Focal length of a lens is 25 cm. Its power is …….

A) 5D
B) 6D
C) 4D
D) 0.04D

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C) 4D

Explanation:Focal length of a lens is 25 cm. Its power is ……. 4D
(Power of a lens (P) is given by ( P = $\frac{1}{f}$ ) (in meters). Here, ( f = 0.25 m ), so ( P = $\frac{1}{0.25}$ = 4 D ).)

85) When a person is suffering from both Myopia and Hypermetropia, which should be used

A) Bi-convex lens
B) Bi-concave lens
C) Bi-focal lens
D) Bi-focal mirror

View Answer

C) Bi-focal lens

Explanation:When a person is suffering from both Myopia and Hypermetropia, which should be used?
Bi-focal lens
(A bi-focal lens has two parts: the upper part corrects myopia (short-sightedness), and the lower part corrects hypermetropia (long-sightedness).)

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