Physics Past Questions and Answers

The diagram shows the variation of volume V of a glass with temperature at the point X is

A -32^oC
B -100^oC
C -273^oC
D -373^oC

Question 732:

The volume and pressure of a given mass of gas at 27^oC are 76cm³ and 80cm of mercury respectively. Calculate the volume at s.t.p

A 36.2cm³
B 72.8cm³
C 100.0cm³
D 808.9cm³

Question 733:

A piece of metal of mass 50g is cooled from 80^oC to 20^oC. Calculate the amount of heat lost. (specific heat capacity of the material of metal = 450Jkg^-1K^-1)

A 4.50 x 10³J
B 2.25 x 10³J
C 1.80 x 10³J
D 1.35 x 10³J

Question 734:

The mass of water vapour in a given volume of air is 0.05g at 20^oC, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air

A 3.33%
B 5.55%
C 33.33%
D 55.55%

Question 735:

The temperature at which the saturated vapour pressure of a liquid is equal to the external atmospheric pressure is known as its

A Dew point
B Boiling point
C Lower fixed point
D Tripple point