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Question 1: The ratio in % between the amount of water vapour present in the air to the amount of water vapour that it can hold at the same temperature is
A) Humidity
B) Relative humidity
C) Dew point
Explanation: Relative humidity is the percentage of water vapour in the air compared to the maximum it can hold at that temperature.
Question 2: The temperature to which air be cooled at constant pressure to become saturated, is called
A) Wet bulb temperature
B) Dry bulb temperature
C) Dew point
D) Humidity
Explanation: Dew point is the temperature at which air becomes fully saturated with moisture, leading to condensation.
Question 3: Free air temperature, Wet bulb temperature, and Dew point temperature are equal when
A) Air temperature is 0°C
B) Relative humidity is 100%
C) Air temperature is not below 0°C
Explanation: When the relative humidity is 100%, the free air temperature, wet bulb temperature, and dew point are the same.
Question 4: On a rainy day compared to sunny day the length of runway required is
A) More
B) Less
C) Same
Explanation: Wet surfaces reduce friction, increasing the required runway length on rainy days compared to sunny days.
Question 5: The spread (difference) between Free air temperature and Dew point temperature is .... when air is saturated
A) Large
B) Least
C) Same
Explanation: When air is saturated, the difference between free air temperature and dew point temperature is minimal or zero.
Question 6: The saturation vapour pressure over water is …………… than the ice
A) More
B) Less
C) Same
Explanation: The saturation vapour pressure over water is higher than that over ice at the same temperature.
Question 7: As the temperature of the air increases, the amount of water vapour required to saturate it ……..
A) Decreases
B) Increases
C) Remains same
Explanation: Warmer air can hold more water vapour, so the amount required to saturate it increases with temperature.
Question 8: The actual amount of water vapour contained in a given volume of air at a given temperature is termed as
A) Relative Humidity
B) Specific Humidity
C) Absolute Humidity
Explanation: Absolute humidity refers to the total amount of water vapour in a specific volume of air.
Question 9: Humidity Mixing Ratio …… when air is lifted adiabatically
A) Decreases
B) Remains constant
C) Increases
Explanation: The humidity mixing ratio remains constant during adiabatic lifting because no moisture is added or removed.
Question 10: It is the lowest temperature which air would attain by evaporating water into it to saturate it.
A) Wet bulb temp
B) Dry bulb temp
C) Dew point
Explanation: The wet bulb temperature is the lowest temperature that can be reached by evaporating water into the air to saturate it.

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