The Humidity

1. Consider the following statements and answer the question with the help of codes given below: [I.A.S. (Pre) 2006]

Assertion (A) : The amount of moisture in the 4 atmosphere is associated with latitude.

Reason (R) : The ability to keep the moisture in the form of water vapour is related to temperature.

Code:

(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.

Correct Answer: (a) Both (A) and (R) are true, and (R) is the correct explanation of (A).

Solution:Measure of water vapour present in the air is known as humidity. Humidity in the atmosphere is mainly related to temperature, So reason (R) is correct. Moisture/Water vapour content decreases with increase in latitude, that is, in tropical region humidity is 2.6%, at 50° latitude it is 0.9% and at 70° latitude it is 0.2% only. The atmosphere contains 90% moisture up to 5 km height from the ground. So the Assertion (A) is also correct. Humidity is directly propositional to temperature, that is at higher temperature air can hold more water vapour than the same amount of air at lower temperatures, so reason (R) is the correct explanation assertion of (A).

2. Humid heat is experienced in summer when the weather is: [U.P.U.D.A./L.D.A. (Pre) 2002]

(a) Raw
(b) Keen
(c) Scorching
(d) Muggy

Correct Answer: (b) Keen

Solution:Humidity is the amount of water vapour in the air. In summer, humidity is very high therefore weather is muggy. Absolute humidity is the weight of water vapour per unit volume, usually expressed in grains per cubic foot.

3. Humidity is the result of: [Jharkhand P.C.S. (Mains) 2016]

(a) Evaporation
(b) Transpiration
(c) Presence of heat
(d) Presence of moisture in the air

Correct Answer: (d) Presence of moisture in the air

Solution:Humidity refers to the amount of water vapor (or moisture) present in the air. Water vapor is the gaseous state of water, which is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present.

Relative humidity measures the amount of water in the air in relation to the maximum amount of water vapor (moisture) the air can hold at a given temperature. Temperature plays a significant role in determining humidity, as warmer air can hold more water vapor than cooler air.

Absolute humidity is the actual amount of water vapor in the air, regardless of the air's temperature. When water evaporates from land and different water bodies, it becomes water vapor, contributing to humidity.

4. Why are dewdrops not formed on a cloudy night? [I.A.S. (Pre) 2019]

(a) Clouds absorb the radiation released from the Earth's surface.
(b) Clouds reflect back the Earth's radiation.
(c) The Earth's surface would have the low temperature on cloudy nights.
(d) Clouds deflect the blowing wind to ground level.

Correct Answer: (b) Clouds reflect back the Earth's radiation.

Solution:Dew: Dew is the water droplets formed by condensation of water vapour on a relatively cold surface of an object. It forms when the temperature of an object drops below the dew point temperature.

When there is a cloudy weather condition, terrestrial radiation is radiated back to the earth's surface after reflection from clouds. This leads to the formation of Greenhouse condition due to which temperature on the earth's surface is relatively higher. Hence condition becomes un-favorable for the creation of dew.

The Humidity

1. Consider the following statements and answer the question with the help of codes given below: [I.A.S. (Pre) 2006]

2. Humid heat is experienced in summer when the weather is: [U.P.U.D.A./L.D.A. (Pre) 2002]

3. Humidity is the result of: [Jharkhand P.C.S. (Mains) 2016]

4. Why are dewdrops not formed on a cloudy night? [I.A.S. (Pre) 2019]

Related Posts