Worksheet: The Atmosphere | Window on the Word Class 7: Solutions, Notes & Worksheets PDF Download

Q1: Multiple Choice Questions (MCQs)

(i) What holds the atmosphere to the surface of the Earth?
(a) Solar radiation
(b) Gravitational force
(c) Rotation of the Earth
(d) Air pressure

(ii) Which gas makes up the largest portion of the Earth's atmosphere?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen

(iii) The uppermost layer of the atmosphere, which merges with outer space, is called:
(a) Mesosphere
(b) Stratosphere
(c) Exosphere
(d) Thermosphere

(iv) What type of rainfall occurs when moist air rises due to heating of the land and forms towering cumulus clouds?
(a) Cyclonic rainfall
(b) Relief rainfall
(c) Convectional rainfall
(d) Planetary rainfall

(v) The layer of the atmosphere that reflects radio waves and is important for radio communication is the:
(a) Mesosphere
(b) Troposphere
(c) Exosphere
(d) Ionosphere

Q2: Fill in the Blanks

(i) Almost ____% of the atmosphere is composed of nitrogen.
(ii) The rise in average global temperature due to an increase in greenhouse gases is known as ____________.
(iii) The troposphere contains all the gases essential for life and is where ______________ changes occur.
(iv) The atmospheric temperature decreases by about 1°C for every ______ meters of ascent in the troposphere.
(v) Land and sea breezes are examples of ______________ winds.

Q3: Match the Column

Match the items in Column A with the appropriate items in Column B.
Worksheet: The Atmosphere | Window on the Word Class 7: Solutions, Notes & Worksheets


Q4: True or False

(i) The greenhouse effect is a natural phenomenon that has no relation to global warming.
(ii) Altitude affects atmospheric temperature, with higher altitudes being warmer than lower ones.
(iii) Convectional rainfall occurs near the equator and results from rising warm air.
(iv) Local winds like land and sea breezes blow in opposite directions during the day and night.
(v) Absolute humidity measures the ratio of moisture to the air's capacity to hold moisture.

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FAQs on Worksheet: The Atmosphere - Window on the Word Class 7: Solutions, Notes & Worksheets

1. What is the atmosphere?
Ans. The atmosphere is the layer of gases surrounding the Earth. It is made up of mainly nitrogen, oxygen, carbon dioxide, and other trace gases. The atmosphere plays a crucial role in regulating the Earth's temperature and protecting life on the planet.
2. What are the different layers of the atmosphere?
Ans. The atmosphere is divided into five main layers: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has its own characteristics and functions. The troposphere is the lowest layer where weather occurs, while the stratosphere contains the ozone layer that absorbs harmful ultraviolet rays.
3. How does the atmosphere affect weather patterns?
Ans. The atmosphere plays a significant role in shaping weather patterns. Its composition and temperature variations influence the formation of clouds, precipitation, and wind patterns. The interaction between the atmosphere, oceans, and landmasses creates different climate zones and determines the distribution of rainfall and temperature across the Earth.
4. What is the greenhouse effect and its impact on the atmosphere?
Ans. The greenhouse effect is the process by which certain gases in the atmosphere trap heat from the sun and prevent it from escaping back into space. This natural phenomenon is essential for maintaining suitable temperatures on Earth. However, human activities have increased the concentration of greenhouse gases, leading to an enhanced greenhouse effect, which contributes to global warming and climate change.
5. How does air pollution affect the atmosphere?
Ans. Air pollution significantly impacts the atmosphere by introducing harmful substances and pollutants. These pollutants, such as carbon monoxide, sulfur dioxide, and particulate matter, can lead to the deterioration of air quality and have adverse effects on human health and the environment. Additionally, air pollution can contribute to the formation of smog, acid rain, and depletion of the ozone layer.
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