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Important Questions Test: Winds Storms & Cyclones - Class 7 MCQ


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20 Questions MCQ Test Online MCQ Tests for Class 7 - Important Questions Test: Winds Storms & Cyclones

Important Questions Test: Winds Storms & Cyclones for Class 7 2024 is part of Online MCQ Tests for Class 7 preparation. The Important Questions Test: Winds Storms & Cyclones questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Winds Storms & Cyclones MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Winds Storms & Cyclones below.
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Important Questions Test: Winds Storms & Cyclones - Question 1

Which of the following will rise the highest in the atmosphere?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 1

Warm air rises higher. This is because gases expand more when they absorb heat further.

Important Questions Test: Winds Storms & Cyclones - Question 2

What is an anemometer?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 2

An anemometer is a device used for measuring wind speed.

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Important Questions Test: Winds Storms & Cyclones - Question 3

Which of the following is true of the 'eye' of a cyclone?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 3

The 'eye of a cyclone is the least pressure area with very high speed winds revolving around it.

This is because the descending winds in the cyclones's eye don't reach near the surface. They get adiabatically warmed up on descending and start rising again without reaching the surface. Hence the low pressure in the cyclone's eye persists and gets intensified. 

Important Questions Test: Winds Storms & Cyclones - Question 4

Which of the following plays an important role in the early-warning systems for cyclones?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 4

The photographs taken by the satellites help in detecting cyclones.

Important Questions Test: Winds Storms & Cyclones - Question 5

Which of the following is the best thing to do during heavy lightning?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 5

Lightning hits tall structures, water and metallic bodies easily. So, avoiding them will be safer.

Important Questions Test: Winds Storms & Cyclones - Question 6

During the formation of rain, what happens when water vapor changes to rain drops?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 6

The energy contained in the gaseous form (vapour) is more than the energy contained in the liquid form (water). Therefore, when vapour changes to water it loses some heat.

Important Questions Test: Winds Storms & Cyclones - Question 7

How are sea and land breezes caused?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 7

Sea and land breezes are caused because of the uneven heating of the earth through convection currents.

Important Questions Test: Winds Storms & Cyclones - Question 8

On the earth, the winds from the north and the south blow towards the equator. What can we understand from this?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 8

Winds that are cold usually show lateral (sideways) movement while the ones that are warm show vertical movement. Since, the winds blow from the north and the south towards the equator, it must be hotter than the other places.

Important Questions Test: Winds Storms & Cyclones - Question 9

The winds on the earth do not flow in the exact "north to south" or "south to north" directions. Why?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 9

The rotation of the earth from west to east (pulls) changes the north-south winds to northeast-southwest direction and the south-north winds to southeast-northwest direction.

Important Questions Test: Winds Storms & Cyclones - Question 10

What is created temporarily behind when a vehicle moves very fast?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 10

When a vehicle moves very fast, a low pressure is produced temporarily and the wind nearby rushes in to fill its place.

Important Questions Test: Winds Storms & Cyclones - Question 11

From where do the monsoon winds come to India?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 11

The winds coming from the southwest blow over the Indian ocean and bring lots of rains.

Important Questions Test: Winds Storms & Cyclones - Question 12

Upon heating, gases become lighter. Why?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 12

Upon heating, the molecules in the gases go further away from each other and thus become lighter.

Important Questions Test: Winds Storms & Cyclones - Question 13

What is the best thing to do when strong winds blow over a hut having a weak thatched roof?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 13

When winds blow over a weak thatched roof, it creates a low pressure over it and a high pressure inside the hut causing the roof to blow off. Opening the doors and windows reduces this pressure difference and prevents the roof from being blown off.

Important Questions Test: Winds Storms & Cyclones - Question 14

Which of these countries is most likely to be affected by cyclones?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 14

Only Indonesia is nearer to the sea and most likely to be affected by cyclones.

Important Questions Test: Winds Storms & Cyclones - Question 15

Which of the following has the highest pressure?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 15

Pressure is highest in a bottle or any container which is closed.

Important Questions Test: Winds Storms & Cyclones - Question 16

Which of the following is NOT affected by air pressure?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 16

A drinking straw is used by creating a suction with your mouth. Actually this causes a decrease in air pressure on the inside of the straw. Since the atmospheric pressure is greater on the outside of the straw, liquid is forced into and up the straw.

Important Questions Test: Winds Storms & Cyclones - Question 17

Which of the following does NOT increase the humidity of the surrounding air?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 17

Evaporation causes an increase in humidity, the amount of water vapour present in the air. Formation of dew drops on leaves is the result of condensation and not of evaporation.

Important Questions Test: Winds Storms & Cyclones - Question 18

"Water vapor in the atmosphere condenses to form clouds?: From this statement, what can be concluded?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 18

Change of water vapour to water (condensation) takes place at a low temperature. Since, clouds are formed high up in the air, we can conclude that temperature decreases as we go higher in the atmosphere.

Important Questions Test: Winds Storms & Cyclones - Question 19

Which of the following shows that air exerts pressure?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 19

The difference of air pressure between the surface of the liquid and inside the straw or an ink filler pushes the liquid up. Hence, both of them work on atmospheric pressure.

Important Questions Test: Winds Storms & Cyclones - Question 20

Warm air is lighter than cold air. Why?

Detailed Solution for Important Questions Test: Winds Storms & Cyclones - Question 20

Warm air is lighter than cold air because the air in contact with the hot surface of the earth gets heated up, so it expands and becomes lighter.

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