RBSE Solutions for Class 7 Science Chapter 8 Winds, Storms and Cyclones

Rajasthan Board RBSE Solutions for Class 7 Science Chapter 8 Winds, Storms and Cyclones Textbook Exercise Questions and Answers.

RBSE Class 7 Science Solutions Chapter 8 Winds, Storms and Cyclones

RBSE Class 7 Science Winds, Storms and Cyclones InText Questions and Answers

Page 85

Question 1.
I wonder why the winds shown in the figure are not in the exact north - south direction?

Answer:
The winds are not exactly in the north - south direction because earth rotates around a tilted axis.

Question 2. 
I want to know what monsoon winds do for us?
Answer:
These winds carry moisture and bring the rains.

RBSE Class 7 Science Winds, Storms and Cyclones Textbook Questions and Answers  

Question 1. 
Fill the missing word in the blank spaces in the following statements:
(a) Wind is ........................ air.
(b) Winds are generated due to ........................ heating on the earth.
(c) Near the earth’s surface    ........................ air rises up whereas ........................ air comes down.
(d) Air moves from a region of ........................  pressure to a region of ........................ pressure.
Answer:
(a) moving 
(b) uneven 
(c) warm, comparatively cooler 
(d) high air, low air.

Question 2. 
Suggest two methods to find out wind direction at a given place.
Answer:
Wind direction can be determined by:

• Observing the direction in which the leaves of nearby trees are moving or bending.
• Observing the direction in which sand flies, when released from our hands slowly into the air.

Question 3. 
State two experiences that made you think that air exerts pressure (other than those given in the text). 
Answer:
Two experiences that shows that air exerts pressure are:
1. When we blow a balloon, it inflates. But if we continue blowing the balloon beyond its capacity, the balloon bursts.

2. When we board a flight while the plane is trying to land, we feel pain in our ears. This is due to our movement from the upper atmosphere to lower layer that exerts more pressure on our ear drums.

Question 4. 
You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Answer:
No, buying a house with windows but no ventilators would be bad idea. This is because the warm air from inside the house caused by various activities, expands and rises up, and exit through the ventilators. If we want a continue supply of cool and fresh air through the windows, we have to create an opening or ventilation for the spent air to pass out. That is why both windows and ventilators are required for a good designing of a house.

Question 5. 
Explain why holes are made in hanging banners and hoardings.
Answer:
Air exerts pressure and moving air also has some pressure. So when a hoarding or banner comes in the direction of wind, air exerts pressure on it and can damage it or tear it. This can be avoided if we create a passage for the air by making holes in hanging banners and hoardings.

Question 6. 
How will you help your neigh hours in case cyclone approaches your village / town?
Answer:
We can help our neighbours during a cyclone by helping them to learn about various safety precautions to take such as:

1. Avoid drinking polluted water,
2. Avoid walking or drinking in flooded streets to prevent getting an electric shock or water borne skin diseases.
3. Helping them to move to safer shelters.
4. Helping them to stock up of food and water as well as emergency medical kit.
5. Making them aware of periodic updates of the weather conditions.
6. Keeping the number of doctors, fireman and police handy.

Question 7. 
What planning is required in advance to deal with the situation created by a cyclone? 
Answer:
The planning done on the part, of the government should include:

1. Reliable forecasting.
2. Prompt broadcasting.
3. Arranging cyclone shelters.
4. Organising methods for moving the affected people to safer places by coordinating with national or international organisations.

The public can plan in advance by:

1. Stocking up drinking water and food for several days.
2. Keeping an emergency medical kit handy.
3. Making arrangements for relocating family members, house goods, vehicles or pets.
4. Having some emergency numbers such as - fireman, hospital, and police handy.
5. Unplugging all electric devices.

Question 8. 
Which one of the following place is unlikely to be affected by a cyclone?
(i) Chennai 
(ii) Mangaluru (Mangalore)
(iii) Amritsar 
(iv) Puri 
Answer:
(iii) Amritsar.

Question 9. 
Which of the statements given below is correct?
(i) In winter the winds flow from the land to the ocean.
(ii) In summer the winds flow from the land towards the ocean.
(iii) A cyclone is formed by a very high - pressure system with very high - speed winds revolving around it.
(iv) The coastline of India is not vulnerable to cyclones.
Answer:
(i) In winter the winds flow from the land to ocean.