Physics Past Questions and Answers

A solid weighs 4.8g in air, 2.8g in water and 3.2g in Kerosine. The ratio of density of the solid to that of the kerosine is

A 2
B \(\frac{3}{2}\)
C \(\frac{2}{3}\)
D 3

Question 17:

One of the following readings represents the measurement of the length of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is

A 5.16cm
B 5.165cm
C 5.0cm
D 5.160cm

Question 18:

When a sound wave passes from air into water its

A Speed and frequency increases but its wavelength remains the same
B Speed and wavelength increases but its frequency remains the same
C Speed decreases
D Speed increases but its frequency and wavelength decreases

Question 19:

A convex mirror is used as a driving mirror because
I. its image is erect
II. It has a large field of view
III. It has a long focal length
Identify the CORRECT statement(s)

A I and III only
B I and II only
C II and IIII only
D I, II and III only

Question 20:

Two mirrors of the same length are arranges as show in the diagram. A ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

A 220\(^o\)
B 200\(^o\)
C 210\(^o\)
D 180\(^o\)