8. Winds, Storms and Cyclones
Class: VII
1. Fill in the blanks:
(a) Moving
(b) Uneven
(c) Hot; cold
(d) High; low
2. Wind direction at a place can be found by either producing smoke by an incense stick or by dropping a
feather or small piece of paper at a place.
3. A parachute is able to bring any person down with slow speed because of the air pressure inside it and the
tube inside a tyre inflates due to air pressure only.
4. I will never buy a house having windows only but no ventilators because hot air inside a house will not be
able to escape out and fresh cold air will not be able to take its place. Due to which the person living in that
house will feel uneasy during hot days.
5. Holes are made in hanging banners and hoardings because with their large surface area they experience
huge pressure from the air. Sometimes fast moving air can tear them off or bring them down. To minimize
the pressure exerted by the air they are perforated.
6. I will help my neighbours in case cyclone approaches in my town by passing timely information to them and
if possible, to look for a strong hiding place for them.
7. If a cyclone is forecasted at a place then we should make necessary arrangements to shift the essential
household goods, domestic animals and vehicles, etc. to safer places. Keep ready the phone numbers of all
emergency services like police, fire brigade, and medical centres.
8. (iii) Amritsar
9. The following statements are 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.