Physics : PRE Medical Entrance Question Bank
(Paper - 6)

1. The length of a simple pendulum is increased by 44%. What is the percentage increase in its time period?
A. 20%
B. 10%
C. 35%
D. none

2. When a wave is refracted into another medium, which of the following will change?
A. Velocity
B. Amplitude
C. Both 1) and 2)
D. None of the above

3. Which mirror should be used to obtain a parallel beam of light from a small lamp?
A. Concave mirror
B. Plane mirror
C. Convex mirror
D. None of the above

4. Which of the following parameters does not change when light travels from air into a glass slab?
A. Wavelength
B. Frequency
C. Velocity
D. Amplitude

5. The refractive index of a glass prism depends upon
A. the colour of the incident light
B. the angle of the prism
C. the intensity of the incident light
D. None of the above

6. The frequency of vibrations of mass m suspended from a spring of spring constant k is given by a relation of the type f = Cmxky, where C is the dimensionless constant. The values of x and y are
A. x = -1/2, y = 1/2
B. x = 1/2, y = -1/2
C. x = -1/2, y = -1/2
D. x = 1/2, y = 1/2

7. Magnetic permeability of a medium has the dimensions of (elecric charge as a fundamental quantity)
A. [M1L1T0Q-2]
B. [M1L2T2Q-2]
C. [M0L1T2Q-2]
D. [M1L0T-2Q-2]

8. A point moves in a straight line so that its displacement 'X' m at time 't' seconds is given by X2 = 1 + t2. Its acceleration (in m/s2) at a time 't' seconds is
A. 1/X3
B. -1/X2
C. (1/X) - (t2/X3)
D. (1/X) - (1/X2)

9. A man swims from a point A on one bank of river of width 100 m. When he swims perpendicular to the water current (Vr), he reaches the other bank 50 m down the stream. The angle to the bank, at which he should swim, to reach the directly opposite point B on the other bank is
A. 60o up the stream
B. 30o up the stream
C. 45o up the stream
D. tan -1(1/2) up the stream

10. In the terrestrial telescope, the eye piece produces the final image at
A. infinity
B. the least distance of distinct vision from the objective
C. the least distance of distinct vision from the eye piece
D. a distance from the eye piece equal to the length of the telescope

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