Page 130 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

v A cyclone is a large-scale air mass that rotates around a strong centre of low atmospheric

pressure.
v A tornado is a violent spinning storm in the shape of a dark funnel with a narrow end on the

land.
v Tornadoes that are formed over water bodies are called water spouts.
v A range of technological advances has now made cyclone forecasting a lot more accurate,

thus reducing risks.

Exercise

A. Tick (3) the correct answer.

1. Which one of the following places is unlikely to be affected by a cyclone?
(a) Amritsar (b) Puri (c) Mangaluru (d) Chennai
Ans. (a)

2. Which phenomena does not occur in atmosphere?

(a) Wind (b) Cyclone (c) Rain (d) Earthquake
Ans. (d)
3. Wind is caused due to ....................... .

(a) Difference in air pressure of two regions (b) Difference in humidity

(c) Even heating of land and water (d) None of the above
Ans. (a)
4. Formation of a thunderstorm requires ....................... .

(a) Moisture (b) Rapidly rising warm water
(c) Sea breeze (d) All of the above

Ans. (d)
5. Short bursts of wind moving at a high speed are known as ........................ .

(a) Tornadoes (b) Gusts (c) Cyclone (d) Storms
Ans. (b)

6. What is not a feature of a thunderstorm?
(a) heavy rains (b) lightning (c) fast moving winds (d) loud noise
Ans. (d)

B. Fill in the blanks.
1. The monsoon winds carry ...................... and it rains.

Ans. moisture
2. Air ...................... on heating and ...................... on cooling.

Ans. expands, contracts
3. Difference of temperature between two regions sets ...................... in air.

Ans. movement

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