Physics Past Questions and Answers

The major difference between a pure semiconductor and a pure metal is that

A Metals are harder than semiconductor
B While resistance of metals decrease with temperature , the reverse is the case for semiconductor
C The resistance of metals increases with temperature, while for semiconductors, it is the reverse
D Metals have forbidden gaps while semiconductors have not

Question 42:

When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

A Lost energy
B Work function
C Binding energy
D Stability energy

Question 43:

A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction

A \( 2 \times 10^{-4}J \)
B \( 2 \times 10^{-3}J \)
C \( 2 \times 10^{1}J \)
D \( 2 \times 10^{2}J \)

Question 44:

A ray of light is incident on an equilateral triangular glass prism of refractive index 3/2, Calculate the angle through which the ray is minimally deviated in the prism

A 30.0\(^{\circ} \)
B 37.2\(^{\circ} \)
C 42.0\(^{\circ} \)
D 48.6\(^{\circ} \)

Question 45:

In the calibration of an ammeter using faraday's laws of electrolysis, the ammeter reading is kept constant at 1.2A. If 0.990g of copper is deposited in 40 minutes , the correction to be applied to the ammeter is

A 0.03A
B 0.04A
C 0.05A
D 0.06A