TRB Assistant Professor Previous Year Question Paper - 1

Question: 1

The boiling point of water at 1 atmospheric pressure is

(A) 0°C

(B) 100°C

(C) 120°C

(D) -79°C

Ans: B

100°C

Question: 2

Sound is a

(A) Longitudinal mechanical wave

(B) Longitudinal non mechanical wave

(C) Transverse non mechanical wave

(D) Transverse mechanical wave

Ans: A

Longitudinal mechanical wave

Question: 3

What is the order of magnitude of electric resistance of the human body (dry)?

(A) 102 ohm

(B) 103 ohm

(C) 104 ohm

(D) 106 ohm

Ans: C

104 ohm

Question: 4

The focal length of concave mirror is

(A) The distance between the principal focus and the centre of curvature

(B) The distance between the pole of the mirror and the principal axis.

(C) The distance between the pole of the mirror and the centre of curvature.

(D) None of these

Ans: B

The distance between the pole of the mirror and the principal axis.

Question: 5

Optical fibre works on the principle of

(A) Total internal reflection

(B) Refraction

(C) Scattering

(D) Interference

Ans: A

Total internal reflection

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