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Dew point and humidity - class-X

Covers concepts of relative humidity, dew point, their measurements, calculations, and effects on human comfort

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

The most comfortable value for Relative Humidity is

  1. 10%
  2. 20%
  3. 50%
  4. 90%
Question 2 Multiple Choice (Single Answer)

The most comfortable value for RH is ______.

  1. 10%
  2. 30%
  3. 50%
  4. 90%
Question 3 Multiple Choice (Single Answer)

At dew point. Relative Humidity is

  1. 10%
  2. 20%
  3. 50%
  4. 100%
Question 4 Multiple Choice (Single Answer)

If RH is high:

  1. we feel sultry
  2. we perspire less
  3. clothes do not dry easily
  4. all the above are correct
Question 5 Multiple Choice (Single Answer)

The units of Relative Humidity are

  1. $kg-m^{3}$
  2. kg
  3. $kg-m^{2}$
  4. none of these
Question 6 Multiple Choice (Single Answer)

Write the correct alternatives :
The vapour content in the air is measured using  a physical quantity called...............

  1. Absolute humidity
  2. Relative humidity
  3. Dew point
  4. Humidity
Question 7 Multiple Choice (Single Answer)

When it is raining, the dew point is

  1. $0^\circ C$
  2. $50^\circ C$
  3. $100^\circ C$
  4. room temperature
Question 8 Multiple Choice (Single Answer)

When the room temperature becomes equal to the dew point, the relative humidity of the room is

  1. $100$%
  2. Zero%
  3. $70$%
  4. $85$%
Question 9 Multiple Choice (Single Answer)

We feel most comfortable at relative humidity at:

  1. < 50%
  2. 50%
  3. > 50%
  4. 100%
Question 10 Multiple Choice (Single Answer)

On a day during the Monsoon season, the relative humidity at a place is 90% and the temperature is $15^\circ$ (C) The saturation vapour pressure of water at this temperature is $0.0169, \times, 10^5$ Pa. The partial pressure of water vapour in the air on that day is

  1. $0.9\, \times\, 10^5$ Pa
  2. $0.0169\, \times\, 10^5$ Pa
  3. $0.0152\, \times\, 10^5$ Pa
  4. $1.0\, \times\, 10$^5$ Pa
Question 11 Multiple Choice (Single Answer)

When air is saturated, it cannot hold ____________.

  1. more water vapour
  2. more air
  3. more carbon dioxide
  4. more oxygen
Question 12 Multiple Choice (Single Answer)

At dew point. RH is _______.

  1. 10%
  2. 30%
  3. 50%
  4. 100%
Question 13 Multiple Choice (Single Answer)

The relative humidity on a day when partial pressure of water vapour is $0.012 \times 10^5 Pa$ at $12^oC$ is (Take vapour pressure of water at this temperature as $0.016 \times 10^5$ Pa)

  1. 70%
  2. 40%
  3. 75%
  4. 25%
Question 14 Multiple Choice (Single Answer)

Formation of dew is an example for ......

  1. Boiling
  2. Melting
  3. Condensation
  4. Evaporation
Question 15 Multiple Choice (Single Answer)

When it is raining, the dew point is:

  1. 0$^o$C
  2. 60$^o$C
  3. 100$^o$C
  4. room temperature
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