Class 7 Geography Chapter 4 Question Answers - Air

Very Short Question Answers :

Q1: All the living beings on the earth depend on the atmosphere for their survival. (T/F)
Ans: True

The atmosphere provides oxygen for breathing, carbon dioxide for plants, and protection from harmful solar radiation.

Q2: Oxygen is the most plentiful gas in the air. (T/F)
Ans: False

Nitrogen is the most abundant gas in the air, comprising about 78%, while oxygen makes up around 21%.

Q3: Green plants use ………… to make their food.
Ans: Carbon dioxide

Plants use carbon dioxide during photosynthesis to produce food and oxygen.

Q4: Which among the following sphere is suitable for flying airplanes?
Ans: Stratosphere

The stratosphere has stable air and is free from weather disturbances, making it ideal for flying.

Q5: In……………meteorites burn up in this layer on entering from the space.
Ans: Mesosphere

Meteorites burn due to friction with the air in the mesosphere.

Q6: In thermosphere, temperature rises very rapidly with increasing height. (T/F)
Ans: True

The thermosphere absorbs high-energy radiation, causing the temperature to rise rapidly with altitude.

Q7: Which among the following is not a part of the atmosphere?
a. Troposphere
b. Stratosphere
c. Mesosphere
d. Hydrosphere
Ans: Hydrosphere

The hydrosphere refers to Earth's water bodies, not the layers of the atmosphere.

Q8: The amount of ……………… decreases from the equator towards the pole.
Ans: Temperature

The equator receives more direct sunlight, resulting in higher temperatures compared to the poles.

Q9: The air pressure is highest at sea level and decreases with height. (T/F)
Ans: True

Air pressure is greatest at sea level due to the weight of the atmosphere and decreases as altitude increases.

Q10: Those winds which blow only during a particular period of the day or year in a small area are called…………….
Ans: Seasonal winds

Seasonal winds, like monsoons, are restricted to specific seasons or times of the year.

Q11: Exosphere is the uppermost layer of the earth. (T/F)
Ans: True

The exosphere is the outermost layer of Earth's atmosphere and gradually merges with outer space.

Q12: In which of the following layer of the atmosphere almost all the weather phenomena occur?
a. Troposphere
b. Stratosphere
c. Mesosphere
d. Exosphere
Ans: Troposphere

Weather phenomena such as rain, clouds, and storms occur in the troposphere.

Q13: The degree of hotness and coldness of the air is known as……………….
Ans: Temperature

Temperature measures the intensity of heat or cold in the atmosphere.

Q14: ………………………released in the atmosphere creates a greenhouse effect.
Ans: Carbon dioxide

Carbon dioxide traps heat in the atmosphere, leading to the greenhouse effect.

Q15: When air is heated, it expands, becomes lighter, and goes up. (T/F)
Ans: True

Hot air is less dense than cold air, causing it to rise.

Q16: Climate is the hour-to-hour, day-to-day condition of the atmosphere. (T/F)
Ans: False

Climate refers to long-term weather patterns, while hour-to-hour and day-to-day conditions refer to weather.