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SAI International School
Class VII
Home Assignment
Subject: Physics
Ch-Wind, Storm and Cyclones
Subtopic: Air Pressure

Any one option is correct. Marks
1. Which of the following is not a unit of Pressure? 1
a) atm
b) Bar
2
c) m
d) Pascal
2. Choose the incorrect statement from the following: 1
a) Air pressure decreases as we move upwards from the surface of the earth.
b) When temperature increases, air pressure decreases.
c) When the humidity is high, the air pressure is less.
d) Air pressure increases with increase in rotation of earth.
3. Which of the following is not associated with affecting air pressure? 1
a) Temperature
b) Lustre of surface
c) Altitude
d) Humidity
4. In which direction atmosphere exerts pressure on us? 1
a) Upward
b) Downward
c) Sideways
d) All sides
Each of these questions contains an Assertion followed by Reason. Read them carefully and
answer the question on the basis of following options. You have to select the one that best
describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of
Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
(e) If Assertion & Reason both are incorrect.
5. Assertion: Air pressure is caused due to weight of the air. 1
Reason: Air molecules have weight present in the atmosphere.
6. Assertion: High speed wind is accompanied by low air pressure. 1
Reason: High speed wind blows large amount of air from that particular region.
7. Assertion: Mountaineers suffers nose bleeding at high altitude. 1
Reason: The blood vessels present inside their nose bursts due to pressure
difference.
8. Assertion: Mountaineers feel dizzy on mountains. 1
Reason: Mountaineers are tired due to tracking.