# National Standard Examination in Physics (NSEP) Solved Paper 2016 Part-1

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Q: 1. Two factories are sounding their sirens at 400 Hz each. A man walks from one factory towards the other at a speed of 2 m/s. the speed of sound is 320 m/s. The number of beats heard per second by the man is

(A) 6

(B) 5

(C) 2.5

(D) 7.5

Answer: (B)

Q: 2. The adjacent figure shows I – V characteristics of a silicon diode. In this connection three statements are made –

(I) The region OC corresponds to reverse bias of the diode,

(II) The voltage at point A is about 0.2 volt, and

(III) Different scales have been used along +ve and –ve directions of Y-axis.

Therefore,

(A) Only statement is correct

(B) Only statement are correct

(C) Only statements are correct

(D) All statements are correct

Answer: (C)

Q: 3. Two identical lenses made of the same material of refractive index 1.5 have the focal length 12 cm. These are kept in contact and immersed in a liquid of refractive index 1.35. The combination behaves as

(A) Convex lens of focal length 27 cm

(B) Convex lens of focal length 6 cm

(C) Convex lens of focal length 9 cm

(D) Convex lens of focal length 6 cm

Answer: (A)

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