Physics · Geography

Atmospheric Physics and Humidity

935 Questions

Study the principles of atmospheric physics and humidity through these practice questions. Key subjects include the rate of evaporation, temperature inversions, and relative humidity measurements. These concepts are vital for geography and physics exams.

Evaporation and condensationRelative humidity conceptsAtmospheric pressure effectsTemperature inversion

Atmospheric Physics and Humidity Questions

Multiple choice

The calibrated airspeed corrected for pressure altitude and temperature is called as

  1. TAS

  2. GS

  3. CAS

  4. EAS
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

True Airspeed (TAS) is the calibrated airspeed corrected for pressure altitude and temperature variations. While Calibrated Airspeed (CAS) accounts for instrument and position errors, TAS represents the actual speed of the aircraft through the air mass. This correction is essential because air density decreases with altitude, making TAS higher than Indicated Airspeed at altitude.

Multiple choice

Which of the following is not correct about air?

  1. Air is colourless.

  2. Air is odourless.

  3. Air is a mixture of six different gases.

  4. 99 % mass of the atmosphere is confined to the height of 32 km from the earth’s surface.

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

No, it is a mixture of nine different gases. Nitrogen, Oxygen, Argon, Carbon dioxide, Neon, Helium, Krypto, Xenon, and Hydrogen.

Multiple choice

Which of the following is incorrect?

  1. Water vapour is a gas in the atmosphere.

  2. In the warm and wet tropics, it may account for four percent of the air by volume.

  3. Water vapour increases with altitude.

  4. It absorbs parts of the insolation from the sun.

  5. It preserves the earth’s radiated heat.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

No, water vapour is a variable gas in the atmosphere, which decreases with altitude.

Multiple choice

Which one of the following item cannot be used to demonstrate the presence of air?

  1. Wind mill

  2. Fan

  3. Firki

  4. Moving car
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A moving car does not directly demonstrate the presence of air in the way the other options do. Windmills and fans both work by harnessing air movement. A firki (toy pinwheel) spins when air blows through it, visibly showing air's presence. While a car experiences air resistance (drag), it doesn't demonstrate air's presence to an observer in the same direct, visual way.

Multiple choice

Which of the following is not a property of air?

  1. Colourless

  2. Transparent

  3. Does not exert pressure

  4. Odourless
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air does exert pressure - atmospheric pressure is about 101.325 kPa at sea level. This is why we can drink through straws, how suction cups work, and why weather systems move. The statement 'Does not exert pressure' is false, making it the correct answer to 'which is NOT a property of air'. Air IS colorless, transparent, and odourless.

Multiple choice

Why is air considered to be a matter?

  1. As air occupy space

  2. As air exert pressure

  3. As air is colourless

  4. As air has motion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Matter is defined as anything that has mass and occupies space. Air occupies space, which is why it is considered matter. The other options, while some may be true about air, are not the reasons that make it matter.

Multiple choice

What is air in motion called as?

  1. Gases

  2. Wind

  3. Vapours

  4. Atmosphere

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Wind is simply air in motion. When air moves horizontally from high pressure to low pressure areas, we experience it as wind. Gases and vapours are states or types of substances, while atmosphere is the layer itself, not its motion.

Multiple choice

Which component in the air contributes towards Humidity?

  1. Oxygen

  2. Dust particle

  3. Water vapour

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Humidity refers to the amount of water vapour present in air. Water vapour is the gaseous form of water and is the component directly responsible for humidity levels. Oxygen, nitrogen, and dust particles do not contribute to humidity.

Multiple choice

During rainy seasons most eatables become moist and tender. what does it indicate?

  1. Air contain oxygen

  2. Air contains water vapours

  3. Air contain dust particles

  4. Air contain carbon dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Air contains water vapours, and during rainy seasons, humidity levels are very high. This increased moisture in the air makes food items absorb water and become moist and tender. This is why things feel damp and why salt or sugar clumps together in monsoon weather.

Multiple choice

Which of the following statements is/are incorrect?

(a) We can see and feel air. (b) Atmosphere is essential for life on earth. (c) Oxygen is not necessary for burning and breathing. (d) Plants and animals exchange air and are interdependent on each other.

  1. a and b

  2. b and d

  3. a and c

  4. c and d

  5. a and d
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as both the statements are incorrect, because we cannot see air, but can feel it. Also, oxygen is necessary for burning and breathing.

Multiple choice

What is the measure of moisture in air called?

  1. Temperature

  2. Rainfall

  3. Humidity

  4. Snowfall
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The composition of air is CO2, N2, O2, traces of some other gases and water vapours. More the water vapours in the air, more the moisture content. The measure of water vapour in the air is known as humidity.

Multiple choice

During which time, maximum rate of evaporation has been observed?

  1. Dawn

  2. Noon

  3. Dusk

  4. Night
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Evaporation takes place when there is heat or sunlight available causing the increase in temperature which results in the formation of water vapours. At noon, maximum rays of sunlight reach the earth's surface causing increase in temperature. Thus maximum rate of evaporation takes place not noon.

Multiple choice

For preparation of weather maps, which of the following reasons is correct, for measuring air pressure at station level after reducing it to sea level?

  1. Because of the effect of wind in denser gravity

  2. For adjusting variations caused by air motions

  3. Because of the vertical pressure exerted by gradient forces

  4. For eliminating the effect of altitude

  5. For eliminating the effect of turbulent wind patterns and air masses
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In order to eliminate the effect of altitude on pressure, it is measured at any station after being reduced to sea level for purposes of comparison. Thus, this is the correct answer.