TS Polycet (Polytechnic) 2022 Previous Question Paper with Answers And Model Papers With Complete Analysis

81) If the focal length of a spherical mirror is 10cm, what is the value of radius of curvature?

A) 10cm
B) 20cm
C) 30cm
D) None

View Answer

B) 20cm

Explanation: $f = \frac{R}{2} \Rightarrow R = 2f = 20cm$

82) Which of the following is the formula for magnification in case of spherical mirror ?

A) $\frac VU$
B) $\frac{-V}U$
C) $\frac UV$
D) $\frac{-U}V$

View Answer

B) $\frac{-V}U$

Explanation:Magnification (m) = -V/U for a spherical mirror
$\frac{-V}{U}$

83) Parallel beam of a light after passing through a convex lens pass through a point called

A) Pole
B) Centre of curvature
C) Focus
D) None of the above

View Answer

C) Focus

Explanation:Parallel rays through convex lens converge at focus

84) Multimeter can be used to measure

A) current
B) voltage
C) resistance
D) all of the above

View Answer

D) all of the above

Explanation:Multimeter measures current, voltage, and resistance
all of the above

85) Which of the following relation represents Ohm’s law?

A) Vα 1
B) Vα $\frac11$
C) V=1
D) P=VI

View Answer

A) Vα 1

Explanation:Ohm’s Law: $V = IR$ , so V ∝ I

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