Physics Practice Test – Kinetic Theory of Matter and the Gas Laws (Questions with Answers and Explanations)

The water manometer in the figure above is measuring the pressure of the gas supply. If the specific gravity of mercury is 13.6 and the atmospheric pressure is 70 cm of mercury, what is the total pressure of the gas supply in cm of water? (JAMB 1982) 

A. 67 cm
B. 73 cm
C. 494 cm
D. 952 cm

A mass of gas at 7°C and 70 cm of mercury has a volume of 1200 cm³. Determine its volume at 27°C and pressure of 75 cm of mercury. (JAMB 1989) 

A. 1200 cm³
B. 1378 cm³
C. 4320 cm³
D. 4629 cm³

A column of air 10.0 cm long is trapped in a tube at 27°C. What is the length of the column at 100°C? (JAMB 1989)

A. 12.4 cm
B. 13.7 cm
C. 18.5 cm
D. 37.0 cm

In the J-tube, 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. (JAMB 1999) 

A. 15 cm³
B. 25 cm³
C. 35 cm³
D. 45 cm³

A given mass of an ideal gas occupies a volume at a temperature T and under a pressure P. If the pressure is increased to 2P and the temperature reduced to  T, then the percentage change in the volume of the gas is _______ (JAMB 1984) 

A. 0%
B. 25%
C. 75%
D. 300%