Question

Q.1 Fill in the blanks :

1) Moving air is called _________________.

2) The centre of the cyclone is the calm area which is called the ____________ of

the storm.

3) ____________ is a dark funnel shaped cloud that reaches the ground from the

sky.

4) The word monsoon is derived from the arabic word mans am which means

_____________.

5) The instrument that measures the wind speed is called _______________.

Q.2 Correct the following statements by replacing the highlighted word.

1) Warm air is heavier than the cold air.

Ans. ______________________________________________________________

2) The pressure of the air decreases if the speed of the wind is decreased.

Ans. ______________________________________________________________

3) Cyclones are constructive because they can damage houses, telephones and

other communication systems, agriculture, trees etc.

Ans. ______________________________________________________________

4) The even heating of the earth surface is the main canse of wind movement.

Ans. ______________________________________________________________

5) The overfilled bicycle tube bursts because the pressure inside it becomes less

than the atmospheric pressure outside.

Ans. ______________________________________________________________​

Answer 1

Answer:

1) wind

2)the eye

3)tornado

4) weather

5) anemometer

Answer 2

Answer:

1.Wind

2.Eye

3.tornado

4.The word monsoon comes from the Arabic word mausim, which means weather.

5.anemometer

2 -1.Warm air is lighter than cold air because they have more heat energy, which results in the increase in distances between the molecules. This decraeses the density, and hence makes it lighter than cold air.

2.When wind speed increases, air particles are moving away from a particular place, and hence the air pressure decreases. If the speed of the wind increases. the pressure decreases and if the speed decreases the pressure increases.

3.Cyclones in coastal areas severely affect all these components of agriculture sector through direct damage by high speed wind, torrential rain and extensive flooding. High tide may bring in saline water and sand mass making the fields unsuitable for agriculture.

4.The movement of air through Earth's -- or any planet's -- atmosphere is called wind, and the main cause of Earth's winds is uneven heating by the sun. This uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

5.when the tube is filled to its maximum, the pressure inside the tube becomes greater than the pressure outside. the air molecules do not find enough space to move around and thus the tube burst out. especially in hot day when pressure increase further.

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