Winds, Storms and Cyclones Class 7 Extra Questions and Answers Science Chapter 8 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.
Class 7 Science Chapter 8 Extra Questions and Answers Winds, Storms and Cyclones
Extra Questions for Class 7 Science Chapter 8 Winds, Storms and Cyclones with Answers
Winds, Storms and Cyclones Class 7 Extra Questions Very Short Answer Type
Question 1.
What is wind?
Answer:
Moving air is called wind.
Question 2.
What is the direction of flow of air?
Answer:
Air moves from the region where the air pressure is high to the region where the pressure is low.
Question 3.
Which air is lighter, hot or cool?
Answer:
Hot air is lighter.
Question 4.
Which region gets maximum sunlight?
Answer:
Regions close to the equator get maximum sunlight.
Question 5.
What does monsoon wind carry?
Answer:
Water (moisture).
Question 6.
Where do thunderstorms develop mostly?
Answer:
Thunderstorms develop in hot, humid tropical areas like India very frequently.
Question 7.
What do you mean by the eye of a storm?
Answer:
The centre of a cyclone is a calm area. It is called the eye of the storm.
Question 8.
Which factors contribute to the development of cyclone?
Answer:
Factors like wind speed, wind direction, temperature and humidity contribute to the development of cyclones.
Question 9.
When is cyclone alert issued?
Answer:
A cyclone alert or cyclone watch is issued 48 hours in advance of any expected storm.
Question 10.
When is cyclone warning issued?
Answer:
A cyclone warning is issued 24 hours in advance.
Winds, Storms and Cyclones Class 7 Extra Questions Short Answer Type 1
Question 1.
How are clouds helpful?
Answer:
Clouds bring rain which is vital for survival of living beings. Farmers in our country depend mainly on rain for irrigation.
Question 2.
How does the eye of a cyclone harm us?
Answer:
The low pressure in the eye lifts water surface in the centre. The rising water may be as high as 3-12 metres. It appears like a water wall moving towards the shore. As a result, the seawater enters the low-lying coastal areas, causing severe loss of life and property. It also reduces the fertility of the soil.
Question 3.
How do high-speed winds accompanying a cyclone harm us?
Answer:
High-speed winds accompanying a cyclone can damage houses, telephones and other communication systems, trees, etc., causing tremendous loss of life and property.
Question 4.
Explain the structure of a tornado?
Answer:
Atorando is a dark funnel-shaped cloud that reaches ground from the sky. The diameter of a tornado can be as small as a meter and as large as a kilometre, or even wider. The funnel of a tornado sucks dust, debris and everything near it at the base (due to low pressure) and throws them out near the. top.
Winds, Storms and Cyclones Class 7 Extra Questions Short Answer Type 2
Question 1.
Suggest three effective safety measures for cyclone.
Answer:
- A cyclone forecast and warning service.
- Rapid communication of warnings to the Government agencies, the ports, fishermen, ships and to the general public.
- Construction of cyclone shelters in the cyclone-prone areas, and administrative arrangements for moving people fast to safer places.
Question 2.
Suggest some precautions in a cyclone hit area.
Answer:
- Do not drink water that could be contaminated. Always store drinking water for emergencies.
- Do not touch wet switches and fallen power lines.
- Do not go out just for the sake of fun.
- Do not pressurise the rescue force by making undue demands.
- Cooperate and help your neighbours and friends.
Winds, Storms and Cyclones Class 7 Extra Questions Long Answer Type
Question 1.
Describe the structure of a cyclone.
Answer:
The centre of a cyclone is a calm area. It is called the eye of the storm. A large cyclone is a violently rotating mass of air in the atmosphere, 10 to 15 km high. The diameter of the eye varies from 10 to 30 km. It is a region free of clouds and has light winds.
Around this calm and clear eye, there is a cloud region of about 150 km in size. In this region there are high-speed winds (150-250 km/h) and thick clouds with heavy rain. Away from this region the wind speed gradually decreases.
Question 2.
How does a thunderstorm become a cyclone?
Answer:
Before cloud formation, water takes up heat from the atmosphere to change into vapour. When water vapour changes back to liquid form as raindrops, this heat is released to the atmosphere. The heat released to the atmosphere warms the air around.
The air tends to rise and causes a drop in pressure. More air rushes to the centre of the storm. This cycle is repeated. The chain of events ends with the formation of a very low-pressure system with very high-speed winds revolving around it. It is this weather condition that we call a cyclone.
Question 3.
Suggest precautions if storm is accompanied by lightning.
Answer:
If a storm is accompanied by lightning, we must take the following precautions:
- We should not take shelter under an isolated tree. If in a forest, take shelter under a small tree.
- We must not take shelter under an umbrella with a metallic end.
- We should not sit near a window. Open garages, storage sheds, metal sheds are not safe places to take shelter.
- A car or a bus with closed windows is a safe place to take shelter.
- If in water, we should get out and go inside a building.
- We should not lie on the ground.
Question 4.
Draw a diagram to show the formation of cyclone.
Answer:
Question 5.
Show the phenomena that lead to the formation of clouds, falling of rain and creation of storms and cyclones with the help of a chart.
Answer:
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