Vapours - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 2005

When the temperature difference between the wet and dry bulbs of a hygrometer is high, this indicates that

A. It is about to rain
B. The relative humidity is high
C. There is plenty of sunshine
D. The relative humidity is low

Question 12:

• JAMB 2006

At low humidity in an environment, the human skin is usually?

A. Damp and rough
B. Damp and smooth
C. Dry and rough
D. Dry and smooth

Question 13:

• JAMB 2008

If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?

A. 25%
B. 33%
C. 75%
D. 82%

Question 14:

• JAMB 2010

A vapour is said to be saturated when

A. A dynamic equilibrium exists between liquid molecules and the vapour molecules
B. A dynamic aquilibrium exists such that more molecules return to the liquid than are living it
C. The temperature of the vapour varies
D. The vapour pressure is atmospheric

Question 15:

• JAMB 2010

A vapour is said to be saturated when

A. A dynamic equilibrium exists between liquid molecules and the vapour molecules
B. A dynamic aquilibrium exists such that more molecules return to the liquid than are living it
C. The temperature of the vapour varies
D. The vapour pressure is atmospheric