Physics Past Questions and Answers

A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?

A 200\(\Omega\)
B 50\(\Omega\)
C \(\frac{100}{\pi}\)
D \(\frac{25}{\pi \Omega}\)

Question 2:

An astronomical telescope is said to be in normal adjustment when the?

A Eye is accommodated
B Focal length of an object lens is longer than that of eye piece
C Final image is at the near point of eye
D Final image is at infinity

Question 3:

The velocities of light in air and glass are 3.0 x 10\(^8\)ms\(^{-1}\) and 2.0 x 10\(^8\)ms\(^{-1}\) respectively. If the angle of refraction is 30º, the sine of the angle of incidence is?

A 0.33
B 0.50
C 0.67
D 0.75

Question 4:

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a?

A Concave mirror of focal length 5cm
B Concave mirror of focal length 10cm
C Convex mirror of focal length 5cm
D Convex mirror of focal length 10cm

Question 5:

A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is?

A 3m
B 5m
C 6m
D 10m