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.

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.