Physics Past Questions and Answers

The diagram above shows a lift pump with valves at P and Q. During a downward stroke of the piston

A Both valves are open
B P is open while Q is closed
C P is closed while Q is open
D Both valves are closed

Question 987:

In the J-tube above, Y and X are on the same horizontal level and 30cm³ of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X

A 15 cm³
B 25 cm³
C 35 cm³
D 45 cm³

Question 988:

The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 10⁸ms^-1. What is the frequency of the wave.

A 3.0 x 10⁷Hz
B 9.0 x 10⁷Hz
C 1.0 x 10⁹Hz
D 3.0 x 10⁹Hz

Question 989:

The diagram above shows the prism arrangement in a

A Binocular
B Spectrometer
C Periscope
D Projector

Question 990:

The diagram above shows a magnet X with its south pole moved along a soft - iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are

A North - North
B North - South
C South - North
D South - South