Study of relative humidity - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2003

T^oC051015204060S.V.P(mmHg)4.586.518.9412.6717.5055.10149.00
The table above shows the saturation vapour pressure against temperature in a certain town. If the vapour pressure in this town at 20^oC is 10mmHg, what is the relative humidity?

A. 170.0%
B. 57.0%
C. 17.5%
D. 10.0%

Question 2:

• 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 3:

• JAMB 2012

Dry
Day 1 - 30°C | Day 2 - 29°C | Day 3 - 25°C
Wet
Day 1 - 22°C | Day 2 - 22°C | Day 3 - 21°C
The reading above are for three consecutive days from a wet and dry bulb hygrometer. It can be concluded that the relative humidity for the three days

A. Decreased steadily
B. Remained unchanged
C. Increased steadily
D. Was least on Day 1

Question 4:

• JAMB 2019

The mass of water vapour in a given volume of air is 0.05g at 20°C, 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 5:

• JAMB 2021

Which of the following instruments may be used to measure relative humidity?

A. Hydrometer
B. Manometer
C. Hygrometer
D. Hypsometer