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Winds, Storms and Cyclones

Description: Winds, Storms and Cyclones
Number of Questions: 20
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Tags: Science Class 7 Linear Equations with Variables on Both Sides Reducing Complex Linear Equations to Simpler Forms Solving Linear Equations of the Form ax + b = c Winds & Wind Currents Winds, Storms and Cyclones Destruction Caused by Cyclones and Effective Safety Measures. Thunderstorms and Cyclones.
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Which of the following statements is/are false? a. When warm air of a region rises up, the atmospheric pressure of that region falls. b. A hurricane dies out when it moves over warm tropical seas. c. Hot air rises upwards and cold air sinks down.

  1. Only a

  2. Only a and c

  3. Only b

  4. Only a and b

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option. A hurricane dies out when it moves over warm tropical seas, is a false statement. A Hurricanes dies out when it moves over a land mass because the supply of energy is cut off. 

Which of the following factors contribute to the development of cyclones?

  1. Wind speed

  2. Wind direction

  3. Temperature

  4. Humidity

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option, as all of the above factors contribute in the formation of cyclones.

Which of the following examples prove that moving air exerts pressure?

  1. While riding a bicycle, it is difficult to drive if the wind is blowing in the opposite direction.

  2. While flying a kite, the kite always flows in the direction of the wind.

  3. It is easier to row a sail boat in the direction of the wind.

  4. Leaves fall from trees when strong wind is blowing.

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option, as all of the above are example to prove that moving air exerts pressure.

The air in the northern hemisphere blows in the ______________ direction.

  1. north-west

  2. south-east

  3. north-east

  4. south

  5. south-west

Show answer
Correct Option: E
Explanation:

This is the correct option. The air in the northern hemisphere blows in the south-west direction.

Which of the following safety measures should be adopted by people living in coastal areas to protect themselves from a cyclone?

  1. Paying attention to warning broadcasts from time to time.

  2. In case of a cyclone warning, stock necessary food items and medicines.

  3. If possible, move to a safer place.

  4. Fishermen should not venture into the sea during a cyclone warning.

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option, as all of the above are necessary measures.

Which of the following statements is/are false? a. Hurricanes develop over the oceans in latitudes 8 degrees to 15 degrees north and south. b. All storms are high pressure systems. c. Winds are caused due to uneven heating of the Earth.

  1. Only a

  2. Only b

  3. Only a and b

  4. Only c

  5. Only a and c

Show answer
Correct Option: B
Explanation:

This is the correct option, as the statement is false.

Match the following:

 
a. India 1. Typhoons
b. West Indies 2. Cyclones
c. Japan 3. Willy-Willies
d. Australia 4. Hurricanes

  1. a - 2, b - 4, c - 3, d - 1

  2. a - 2, b - 4, c - 1, d - 3

  3. a - 4, b - 2, c - 1, d - 3

  4. a - 3, b - 4, c - 1, d - 2

  5. a - 2, b - 1, c - 4, d - 3

Show answer
Correct Option: B
Explanation:

This is the correct option. Winds blowing at speed of 120 km/hr are  called cyclones in India. These winds are called hurricanes in West Indies, they are called typhoons in Japan and are called willy-willies in Australia.

 

Which of the following statements is/are false? a. All storms are high pressure systems. b. A wind storm's destructive capacity with increases in wind speed. c. Wind cycles are caused due to uneven heating of land and water as well as the shape of Earth.

  1. Only a and b

  2. Only b

  3. Only b and c

  4. Only c

  5. Only a

Show answer
Correct Option: E
Explanation:

This is the correct option, as this statement is false.  All storms are high pressure systems is a false statement. All storms are low pressure systems.

In winters, the Indian subcontinent becomes very cold and the wind from _____________ starts blowing towards the sea.

  1. north-east

  2. north-west

  3. south-west

  4. south-east

  5. west

Show answer
Correct Option: A
Explanation:

This is the correct option. In winters, the Indian subcontinent becomes very cold and the wind from the north-east starts blowing towards the sea.

Which of the following statements is/are false? a. Smoke goes up in the air because it is lighter than the surrounding air. b. Fast moving wind is accompanied by a fall in air pressure. c. The regions near the poles get maximum heat from the Sun.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only a and c

  5. Only c

Show answer
Correct Option: E
Explanation:

The regions near the poles get maximum heat from the Sun, is a wrong statement. Thus, this is the correct option. The regions near the equator and  not the poles, get maximum heat from the Sun.

When air expands on heating, its ___________ .

  1. mass remains the same, but volume increases

  2. volume remains the same, but mass increases

  3. temperature remains the same, but volume increases

  4. mass remains the same, but temperature increases

  5. volume remains the same, but temperature increases

Show answer
Correct Option: A
Explanation:

This is the correct option. When air expands on heating, its mass remains the same, but volume increases.

The destructive capacity of a wind storm _____________.

  1. increases with the increase in wind speed

  2. decreases with the increase in wind speed

  3. increases with the increase in temperature

  4. decreases with the increase in temperature

  5. increases with the increase in humidity

Show answer
Correct Option: A
Explanation:

This is the correct option. The destructive capacity of a wind storm increases with the increase in wind speed.

Which of the following is a precaution that should be taken by the people living in a cyclone hit area?

  1. Do not touch electric poles, fallen electric wires or wet switches.

  2. Do not drink water contaminated by flood water.

  3. Do not put pressure on rescue workers for taking you to safety.

  4. Do not make unjustified demands from administration.

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option, as all of the above are the precautions to be taken by people living in a cyclone hit area.

Which of the following statements is/are false? a. The difference between the temperatures of two regions sets the convection in air. b. In winters the wind flows from the ocean to the land. c. At sea level, air exerts a pressure of 1.033 kg/cm2.

  1. Only b

  2. Only a and b

  3. Only c

  4. Only b and c

  5. Only a

Show answer
Correct Option: A
Explanation:

This is the correct option, as this statement is false. In winters the wind flows from the ocean to the land, is a false statement. In winters the winds flow from the land to the ocean.

Thunderstorms are caused by violent air currents inside ____________ clouds.

  1. cumulus

  2. contrails

  3. stratus

  4. cirrus

  5. altocumulus

Show answer
Correct Option: A
Explanation:

This is the correct option. Thunderstorms are caused by violent air currents inside cumulus clouds.

Match the following:

 
Name of wind Beaufort number
1. Fresh breeze a. 3
2. Gentle breeze b. 1
3. Moderate gale c. 5
4. Light air d. 7

  1. 1 - a, 2 - c, 3 - d, 4 - b

  2. 1 - c, 2 - a, 3 - b, 4 - d

  3. 1 - c, 2 - a, 3 - d, 4 - b

  4. 1 - b, 2 - a, 3 - d, 4 - c

  5. 1 - c, 2 - d, 3 - a, 4 - b

Show answer
Correct Option: C
Explanation:

This is the correct option. According to the Beaufort scale, fresh breeze has a Beaufort number of 5. A gentle breeze has a Beaufort number of 3. A moderate breeze has a Beaufort number of 7. Light air has a Beaufort number of 1.

The best place to take shelter during a thunderstorm is ___________.

  1. under a big tree

  2. entering a body of water

  3. a big building

  4. getting inside a car

  5. an umbrella with a metal rod

Show answer
Correct Option: D
Explanation:

This is the correct option. The best shelter during a thunderstorm is getting inside a car.

Which of the following has the most important function for advanced cyclone warning?

  1. Central Water Commission

  2. Indian Statistical Department

  3. Indian Metrological Department

  4. Indian Forest Department

  5. Department of Agriculture and Cooperation

Show answer
Correct Option: C
Explanation:

This is the correct option. Advanced cyclone warning is the most important function of the Indian Metrological Department.

Match the following:

 
a. Cyclone 1. The storms accompanied by rain and lightning at a speeds of 89 - 102 km/h.
b. Thunderstorm 2. A dark funnel shaped cloud formed on land such that it reaches from the sky to the ground.
c. Tornado 3. Swirlling winds formed in tropical seas due to the formation of a low pressure region at sea.

  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 2, b - 1, c - 3

  4. a - 2, b - 3, c - 1

  5. a - 1, b - 2, c - 3

Show answer
Correct Option: B
Explanation:

This is the correct option. A cyclone is formed by swirlling winds  in tropical seas due to the formation of low pressure regions at sea. Thunderstorms are the storms accompanied by rain and lightning at a speeds of 89 - 102 km/h. A tornado is a dark funnel shaped cloud formed on land such that it reaches from the sky to the ground.

The instrument used to measure wind speed is called ______________.

  1. ammeter

  2. barometer

  3. anemometer

  4. speedometer

  5. odometer

Show answer
Correct Option: C
Explanation:

This is the correct option. The instrument to measure wind speed is called anemometer.

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