Previous year MCQs

General science UPPSC 2024 GS-I
Question

Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R)

Assertion (A) : Relative humidity decreases with increasing air temperature.
Reason (R) : Absolute humidity increases with increasing evaporation.

Select the correct answer from the codes given below:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Both(A) and (R) are true, but (R) is not the correct explanation of(A).

Detailed Solution:

The correct answer is “Both(A) and (R) are true, but (R) is not the correct explanation of(A).”.
Absolute humidity is the amount of water vapor in a given volume of air, while relative humidity is the amount of water vapor in the air relative to the maximum amount it can hold.

As the air temperature increases, the maximum amount of moisture the air can hold also increases, but if the amount of water vapor remains the same, the relative humidity will decrease.

As evaporation occurs, more water vapor is added to the air, which leads to an increase in absolute humidity.

Similar Questions:

Which of the following is/are used as bio-fertilisers? Select the correct answer from the codes given below:

1. Azolla
2. Blue Green Algae
3. Alfalfa
4. Nitrolim

Codes:
  1. A) 1 and 2
  2. B) 1, 2 and 4
  3. C) 2, 3 and 4
  4. D) 1, 2 and 3
"Neno plug" refers to:
  1. A) a small bullet
  2. B) a small hearing aid
  3. C) a small rocket launcher
  4. D) None of the above
Which one of the following Noble Gases is not present in air?
  1. A) Helium
  2. B) Argon
  3. C) Radon
  4. D) Neon
Consider the following events and arrange them in chronological order:

1. World Heritage Day
2. World Thyroid Day
3. World No Tobacco Day
4. International Day of Light

Select the correct answer from the codes given below:
  1. A) 3,1,2,4
  2. B) 1,4,2,3
  3. C) 2,3,1,4
  4. D) 4,2,3,1
If an apple is released from an orbiting spaceship, it will
  1. A) Fall towards the Earth
  2. B) Move at a lower speed
  3. C) Move along with the spaceship at the same speed
  4. D) Move at a higher speed
'Cloves' are:
  1. A) nodules of stem
  2. B) leaves
  3. C) nodules of roots
  4. D) dried flowers
A hydrophyte is:
  1. A) a marine animal
  2. B) an aquatic plant
  3. C) a plant disease
  4. D) a rootless plant
Which one of the following reflects back more sunlight as compared to the other three?
  1. A) Sand desert
  2. B) Paddy crop land
  3. C) Land covered with fresh snow
  4. D) Prairie Plain
Which of the following is associated with potassium deficiency?
  1. A) Kidney damage and paralysis of muscles
  2. B) Low blood pressure
  3. C) Hip-joint replacement
  4. D) Blood transfusion
Which of the following Gas has highest percentage in atmosphere?
  1. A) Carbon
  2. B) Nitrogen
  3. C) Oxygen
  4. D) Hydrogen
Which of the following is a correct relationship between Fahrenheit ( F ) and Celsius (C ) degrees?
  1. A) C = 9/5 F + 32
  2. B) C= F – 273.15
  3. C) F = 9/5 C + 32
  4. D) F= C – 273.15
The temperature of the human body:
  1. A) decreases in winters
  2. B) increases in summers
  3. C) neither decreases in winters nor increases in summers
  4. D) increases in winters