WORKSHEET 1, WINDS, STORMS AND CYCLONES, CLASS 7 (CH-8)

 Question 1.

Multiple choice questions:
(a) Which among the following exert atmospheric pressure?
(i) Land
(ii) Water
(iii) Air
(iv) All of these

(b) Compared to plains, the atmospheric pressure on hills is
(i) More
(ii) Less
(iii) Same
(iv) Constant

(c) The wind speed is measured by
(i) Wind vane
(ii) Barometer
(iii) Anemometer
(iv) Hygrometer

(d) Which of the following place is most likely to be affected by a cyclone?
(i) Mumbai
(ii) Puri
(iii) Goa
(iv) Porbandar

(e) The central calm area of a cyclone is called
(i) Core
(ii) Eye
(iii) Midpoint
(iv) None of these

(f) A fire alarm usually detects smoke in case of fire. Where should such an alarm be placed in a room?
(i) Near the door
(ii) On the floor
(iii) On the ceiling
(iv) On the wall

Question 2

Fill in the blanks
(a) warm air is_________________________than cold air.
(b) ___________________blow at a speed of 89-102 km hour.
(c)____________________used to measure direction of wind.
(d) A violent tornado can travel at speeds of about__________________km/hr.
(e) The main cause of wind movement is uneven ___________ on the earth.

Question 3

One word answer

1. It is a violent and sudden electrostatic discharge usually during a thunderstorm

2. The instrument to measure the wind speed
3. The moving air is called

4. The formation of a very low-pressure system with very high-speed winds revolving around it.
5. Japanese name for Cyclone
6. It is a dark funnel shaped cloud that reaches from the sky to the ground

7. The swift movement of the falling water droplets along with the rising air create lightning and sound.
8. American name for Cyclone

Question 4

Four schematic diagrams are shown in Figure 8.1 to depict the direction of the sea breeze. Which of them gives the correct direction?

Question 5

Figure shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for the rise in the level of the drink?

Question 6

 Following are precautions one must take in case a storm is accompanied by lightning.

(i) Do not take shelter under a tree.

(ii) Do not take shelter under an umbrella with a metallic end.

(iii) Do not take shelter in open garages, storage sheds, etc.

(iv) Do not take shelter in a bus in the open.

Which one of these is not correct?

Question 7

Name the ocean which is mainly responsible to bring rain-bearing monsoon winds to Kerala coast in June every year?

Question 8

Identify the names of six natural phenomena from the following word diagram given as Figure 8.5.

Question 9

Match Column I with Column II. There can be more than one match.

Column-I	Column-II
a) On heating air	i) Descends
b) On cooling air	ii) Expands
	iii) Contracts
	iv) Rises