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

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81)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
$\frac{-V}{U}$

82)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

83)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

84)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

85)A person is advised to use 5D lens. What is its focal length?

A) 50cm

B) 5cm

C) 2cm

D) 20cm

View Answer

D) 20cm
Explanation:Focal length $f = \frac{100}{D} = \frac{100}{5} = 20 \, \text{cm}$

86)SI unit of resistivity is

A) Ω

B) Ω-m

C) Ω-m²

D) Ωm^-1

View Answer

B) Ω-m
Explanation:SI unit of resistivity is ohm-meter (Ω·m)

87)Focal length of the eye lens changes with the help of

A) Pupil

B) Aqueous humour

C) ciliary muscle

D) Optical nerve

View Answer

C) ciliary muscle
Explanation:Ciliary muscles adjust focal length in the eye
ciliary muscle

88)Direction of electric current and direction of electrons in a conductor are

A) Same direction

B) Perpendicular to each other

C) Opposite to each other

D) None of the above

View Answer

C) Opposite to each other
Explanation:Electrons flow opposite to conventional current
Opposite to each other

89)Obstruction to the motion of electrons in a conductor is called

A) Conductivity

B) Resistance

C) Resistivity

D) None of the above

View Answer

B) Resistance
Explanation:Obstruction to electron flow is resistance

90)The defect by which some people cannot see near objects clearly but can see distance objects is called

A) Myopia

B) Cataract

C) Presbyopia

D) Hypermetropia

View Answer

D) Hypermetropia
Explanation:Can't see near objects = Hypermetropia (farsightedness)

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