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

86) 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 $f = \frac{100}{D} = \frac{100}{5} = 20 \, \text{cm}$

87) 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)

88) 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

89) 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

90) 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

Spread the love