Std 7 geography chapter 5 winds question answer |class 7 geography chapter 5 winds question answer
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Sz edu tutorial
Q.1. Rewrite the following statements after
choosing the correct option.
(1) When the air expands, it
...............
(a) becomes solid
(b) becomes thinner
(c) gets lost
(d) becomes humid
(2) From high air pressure regions, winds
(a) blow to regions of still higher pressure.
(b) blow towards regions of cooler air.
(c) blow towards regions of low air
pressure.
(d) remain still.
(3) In the northern hemisphere, winds
blowing towards the equator.......... due
to the rotation of the earth.
(a) turn to the south
(b) turn to the east
(c) turn to the west
(d) turn to the north
(2) These winds blowing from the north
pole region towards 60° N parallel
cause cold wave conditions in extensive
areas covering North America, Europe
and Russia.
(3) Hilltops get heated quickly during the
day. The air in this part becomes hot,
light and starts ascending. Hence, a
low pressure area forms in this region.
At the same time the air at the foothills
being cooler, and that area experiences
high pressure. Air in that area blows
towards low pressure.
Q.3. Given below are the values of air pressure
in millibars. Using the same, draw
diagrams to show a cyclone and an
anticyclone.
990, 994, 996, 1000
1030, 1020, 1010, 1000
Q.4. State one reason why.
(1) A belt of calm exists near the equator.
(2) The winds coming from the north-west
in the southern hemisphere have
greater velocities than the winds
coming from the south-west in the
Exercises
28
(4) The direction of seasonal winds blowing
over the Indian subcontinent during
winter is from the ........
(a) south-east to north-west.
(b) south-west towards north-east.
(c) north-east to south-west.
(d) north-west to south-east.
(5) The Roaring Forties in the southern
hemisphere
(a) blow towards the equator.
(b) blow in the areas around 40° S
parallel.
(c) blow from the subpolar region of low
pressure.
(d) blow around 40° N parallel.
Q.2. Identify the type of winds from the
description given below.
(1) These winds from the south-west bring
rains to the Indian subcontinent. During
June to September, India gets rains.
After this period these winds retreat.
Q.6. Answer in short:
(1) Why is the air pressure high in polar
areas in both the hemispheres?
(2) What effect does the rotation of the
earth have on the winds?
(3) Why do the cyclonic winds blow in a
circular manner?
(4) State the reasons that lead to the
formation of cyclones and describe the
effects of cyclones.
Activity:
Using the internet, obtain information,
photos and maps of the recent cyclone
that arrived at India's eastern coast.
Write the social and economic effects of
that cyclone.
ICT Question:
Use the mobile app 'Windyty' and try to
know the direction of winds and pressure areas
in the world.
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