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Geography ch 5 - Precipitation · Maharashtra Board STD 9 (MSBSHSE - English Medium). 29 questions.

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29 questions · timed · auto-graded

Question 11 Mark
Why are the areas of high rainfall situated in tropical areas?
Answer
  • Tropical areas receive direct rays of the Sun almost throughout the year. Hence the rate of evaporation1 is high here.
  • The tropical region receives convectional rainfall throughout the year and also orographic rainfall is experienced here.
  • Thus areas of high rainfall are situated in the tropical area.
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Question 21 Mark
Because of the conventional processes, convectional rainfall occurs in the afternoon in equational areas. But why doesn’t it rain in afternoons in the oceanic areas of the equatorial belt?
Answer
One of the necessary conditions of convectional rainfall is intense heating of surface which causes air to expand and rise. Since land heats up faster than water, it rains only on the land in the equatorial regions and not in the oceanic areas.
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Question 31 Mark
We use a raincoat or umbrella to protect ourselves from rainfall. What will you use to protect yourself from severe hailstorms?
Answer
If a person is outside without any coverage, he needs to seek shelter immediately, making sure to protect his head from hailstones.
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Question 51 Mark
Stormy winds and floods are associated with which rainfall type?
Answer
Stormy winds and floods are associated with Cyclonic rainfall.
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Question 61 Mark
What is the difference between A and C?
Answer
In figure 5.4 i.e. convectional rainfall the hot air rises upwards and then the air cools and begins to condense and due to continuous condensation rainfall occurs. Here rainfall is accompanied by lightning and thunder.

In figure 5.6 , i.e. cyclonic rainfall, air from surrounding regions comes towards the centre of the cyclone and starts moving upwards. As it rises, the temperature of the air reduces, condensation occurs and rainfall takes place.

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Question 71 Mark
Shade the rain shadow region in fig B and name it.
Answer
Students to show the leeward side in the picture.
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Question 81 Mark
In fig B, on which side of the mountain is it raining more?
Answer
The windward side is receiving more rainfall.
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Question 91 Mark
Why don’t we get hailstones frequently?
Answer
For the formation of hailstones the following 2 conditions are required:
  • Intense heating which results in upwards air flow.
  • The decrease in air temperature at higher layers of the atmosphere.
  • As India is a tropical country, we do not find cooler air at higher levels because of the intense heating of land.
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Question 101 Mark
Sometimes hailstones destroy the standing crops in the field.
Answer
Hailstones are solid and heavy in nature and they hit the earth due to gravity and this is the reason they destroy the crops in the field.
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Question 111 Mark
We do not have fog until afternoons in summers.
Answer
We do not have fog until afternoons in summer because we are near to equator and we have tropical climate and hot summers.
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Question 121 Mark
In London, there is a fog like this till the afternoon in the winters.
Answer
In London there is fog till the afternoon in winters because London is far away from equator and it has temperate oceanic climate and they have cool summers.
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Question 131 Mark
How do the rain droplets form?
Answer
Clouds form when condensed water droplets and dust particles accumulate forming large rain droplets.
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Question 141 Mark
Generally, it rains between June and September in our region.
Answer
We get rainfall between June and September, in our region when the moisture-laden south-west monsoon winds are obstructed by the Western Ghats leading to orographic rainfall.
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Question 151 Mark
Why isn’t snow found in our surroundings?
Answer
Because we have a moderate temperature and we are closer to the sea, snow is not found in our surroundings.
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Question 161 Mark
Snow is found everywhere in the winters in Kashmir.
Answer
Snow is found everywhere in winters of Kashmir because Kashmir is located at a higher altitude where the temperature falls below freezing point. Hence water vapour directly turn into snowflakes leading to snowfall.
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Question 171 Mark

The blade of grass look like this in winter mornings. From where does the water on the blades of grass come?
Image
Answer
  1. The blade of grass looks like this in winter mornings because of dew. These are small water droplets.
  2. The dew is formed in winter because moisture-laden air near the earth surface comes in contact with cold objects due to which condensation of vapour takes place, turning into small water droplets.
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Question 191 Mark
What is a Cyclone?
Answer
Cyclone is a specific air formation when the pressure at an area is less than the surrounding regions.
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Question 201 Mark
Convectional rainfall is mainly experienced in which region?
Answer
Convectional rainfall is mainly experienced in equatorial region.
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Question 211 Mark
Which type of rainfall occurs because of obstruction of mountain?
Answer
Orographic rainfall occurs because of obstruction of mountains.
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Question 221 Mark
Why don’t hails occur in equatorial areas?
Answer
Hails do not occur in equatorial areas because of the heat in the atmosphere.
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Question 231 Mark
Why don’t hails occur in cold zones?
Answer
Hails do not occur in cold zones because of lack of upward flow.
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Question 251 Mark
Explain the process of sublimation.
Answer
When the temperature in the atmosphere falls below the freezing point, water vapour directly turns into snowflakes this process is called sublimation.
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Question 261 Mark
Name the major forms of precipitation.
Answer
Snow, hailstones and rainfall are the major forms of precipitation.
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Question 271 Mark
What is precipitation?
Answer
When water falls in the solid or liquid state from the clouds to the ground, it is called as precipitation.
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Question 281 Mark
Why do we see different forms of condensation?
Answer
Different forms of condensation are seen due to changes in atmospheric conditions.
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Question 291 Mark
What percentage of the earth’s surface is covered with water?
Answer
70.8% of the earth’s surface is covered with water.
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