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Wind, Storm and Cyclone

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Tube of a bicycle gets inflated when the air is filled in it. Why does this happen?

  1. Air is light

  2. Air flows anywhere

  3. Air exerts pressure

  4. Air expands on heating

  5. All of these


Correct Option: C
Explanation:

Tube of a bicycle gets inflated when the air is filled with it. This happens because air exerts pressure. Air exerts pressure because it is a matter and occupies space and has mass. Since, air is a mixture of different molecules they are pushed together causing pressure with each other.

What is/are the cause(s) of uneven heating of the earth? (a) The position of the sun in the sky (b) The tilt of the earth (c) The uneven surface of the earth

  1. only a

  2. only b

  3. only c

  4. a and b

  5. b and c


Correct Option: B
Explanation:

Yes, it is correct. The tilt of the earth causes sunlight to hit the equator at a more direct angle than it hits the pole, adding more energy to the air near the equator and thus heating it more.

A thatched roof is blown off because of high speed wind. Which of the following reason correctly explains it?

  1. This happens because high speed wind creates an area of low pressure.

  2. This happens because high speed wind creates high pressure.

  3. This happens because high speed wind makes the thatched roof light in weight.

  4. This happens because high speed wind creates low temperature.

  5. None of these


Correct Option: A
Explanation:

This happens because high speed wind creates an area of low pressure. Due to this, the thatched roof is sucked up and finally gets blown away. Thus, increase in wind speed is associated by decrease in air pressure.

Which of the following statement is incorrect regarding sea - breeze? (a) It flows in coastal areas (b) It happens because ocean warms up faster than land (c) The land is filled in by cooler air from the ocean surface

  1. only a

  2. only b

  3. only c

  4. a and b

  5. b and c


Correct Option: B
Explanation:

Yes, it is the correct answer. Only b is incorrect. In coastal areas, the land warms up faster than the ocean surface.

During the night, the land cools down faster than the ocean surface. What will be the flow of air?

  1. The flow of air rises upwards

  2. The flow of air is towards the ocean

  3. The flow of air is towards land

  4. Options 1 and 2

  5. Options 1 and 3


Correct Option: D
Explanation:

Yes, the air which is warm rises upwards creating an area of low pressure near the surface. This is filled in by cooler air from the land. This gives rise to the land breeze.

The flow of moist air from the ocean towards land in summer, annually over a larger area is called _________.

  1. sea breeze

  2. land breeze

  3. monsoon

  4. cyclone

  5. none of these


Correct Option: C
Explanation:

Yes, the flow of moist air from the ocean towards land in summer, annually over a larger area  is called Monsoon or Monsoon wind. Monsoon winds carry water vapour which falls over the land in the form of rain after cooling down.

Ramesh filled his water bottle with hot water and closed its cap tightly. His bottle got distorted when he washed it with cold water. Which of the following is the correct reason behind this?

  1. Pressure inside bottle is lower than outer pressure

  2. Pressure inside bottle is greater than outer pressure

  3. Pressure inside bottle is equal to outer pressure

  4. There is no air inside

  5. The hot water inside the bottle melts and distorts the bottle walls.


Correct Option: A
Explanation:

Yes, it is correct. When boiled water is filled in the water bottle and its mouth is closed,  followed by cold water being poured over it, the bottle gets distorted. This happens because air inside the can gets condensed and creates low pressure. The high pressure from outside distorts the shape of the bottle.

Which of the following factors is NOT responsible for creating a cyclone?

  1. Wind speed

  2. Wind direction

  3. Humidity

  4. Temperature

  5. None of these


Correct Option: E
Explanation:

Yes, it is the correct answer. All the factors are responsible for creating a cyclone.

Very fast moving dark cloud in the shape of funnel is known as a _________.

  1. ice storm

  2. thunderstorm

  3. hurricane

  4. typhoon

  5. tornado


Correct Option: E
Explanation:

Yes, tornadoes are the very fast moving dark clouds in the shape of a funnel. The speed of violent tornadoes may be up to 300km. Tornadoes are as destructive  as cyclones. Tornadoes may form within cyclones.

The centre of the cyclone is called ‘eye’. The eye of a cyclone is a ___________ area.

  1. high pressure

  2. hottest

  3. windy

  4. calm

  5. none of these


Correct Option: D
Explanation:

Yes, it is the correct answer. The eye of a cyclone is a calm area, but around the eye air may move with high speed, being the area of very low pressure, eye of cyclone lifts water in the centre.

When there is no friction, wind is _____________ the geostrophic wind.

  1. equal to

  2. greater than

  3. less than

  4. not affected by

  5. none of these


Correct Option: A
Explanation:

Yes, the actual wind would be equal to the geostrophic wind when there is no friction. Geostrophic wind  is the theoretical wind, that would result from an exact balance between the coriolis effect and the pressure gradient force.

Which of the following areas will be most affected by a cyclone?

  1. Desert

  2. Coastal

  3. Hills

  4. Polar region

  5. None of these


Correct Option: B
Explanation:

Yes, Cyclones create several dangers for people living around tropical areas. The water of a storm surge rushes inland with deadly power, flooding low-lying coastal areas.

Wind is controlled by - (a) horizontal pressure difference (b) earth's rotation (c) friction

  1. only a

  2. only b

  3. a, b and c

  4. a and c

  5. b and c


Correct Option: C
Explanation:

Yes, wind is controlled by a combination of forces:

(a) The pressure-gradient force (PGF), which is the horizontal pressure difference

(b) The coriolis force, which is due to the rotation of earth

(c) Friction

Which of the following is/are the precautionary measures taken before a cyclone hits?

  1. Check that the walls and the roof are secure.

  2. Know the nearest safe high ground.

  3. Keep a list of emergency numbers.

  4. Prepare an emergency kit.

  5. All of these


Correct Option: E
Explanation:

Yes, all are correct.

Which of the following match is/ are incorrect?

a. Cyclone Philippines
b. Hurricane America
c. Typhoon India
  1. only a

  2. only b

  3. only c

  4. a and b

  5. a and c


Correct Option: E
Explanation:

Yes, both a and c are incorrectly matched. Cyclone is known as HURRICANE in the American continent. Cyclone is known by different names in different countries, it is known as TYPHOON in Philippines and Japan.

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