Winds, Storms and Cyclones

A tornado

1. can have diameter as small as a metre and as large as a km, or even wider
2. has a funnel which does not suck everything near it at the base
3. has a funnel which does not throw dust and debris out near the top
4. cannot have a diameter of the order of 10 metres

Consequences of cyclones are:

1. they do not cause severe loss of life and property
2. they increase the fertility of soil by bringing in natural fertilizers
3. they reduce the fertility of soil
4. they help in the development of a country

Cyclones are formed because of the

1. absorbance of heat in the vaporization of water
2. emission of heat in the condensation of water
3. absorbance and emission of heat due to inter-conversion of states of water
4. conduction of wind current

When water condenses from vapour state to liquid state,

1. heat is given out
2. heat is absorbed
3. heat is absorbed and then given out
4. there is no exchange of heat

When water changes its state from liquid state to vapour state,

1. heat is given out
2. heat is absorbed
3. heat is given out and then absorbed
4. there is no exchange of heat

Thunderstorms usually occur in

1. cold, humid tropical areas
2. cold, dry tropical areas
3. hot, dry tropical areas
4. hot, humid tropical areas

If a storm is accompanied by lightning, we should

1. take shelter under an isolated tree
2. take shelter under an umbrella with a metallic end
3. not sit near a window, open garages, storage sheds
4. take shelter under metal sheds

In winter, near the equator

1. wind flows from the land towards the oceans
2. wind flows from west to east
3. wind flows from the oceans towards the land
4. wind flows from east to west

In winter, near the equator the temperature of the land is

1. higher than that of the oceans most of the time
2. lower than that of the oceans most of the time
3. equal to that of the oceans most of the time
4. close to that of the oceans most of the time

Monsoon winds bring

1. rain from oceans to land
2. rain from land to oceans
3. dust from oceans to land
4. dust from land to oceans

Monsoon winds are the winds that flow from

1. the land towards the oceans in summer
2. the oceans towards the land in summer
3. the land towards the oceans in winter
4. the oceans towards the land in winter

In summer, near the Equator

1. wind flows from the land towards the oceans
2. wind flows from west to east
3. wind flows from the oceans towards the land
4. wind flows from east to west

In summer, near the equator the temperature of the land is

1. lower than that of water in the oceans most of the time
2. higher than that of water in the oceans most of the time
3. equal to that of water in the oceans most of the time
4. close to that of water in the oceans most of the time

The direction of wind on the earth is

1. affected by the earth's rotation
2. unaffected by the earth's rotation
3. exactly from north to south and vice versa
4. exactly from east to west and vice versa

Air moves to the regions in the 0-60 degrees latitude from the

1. North Pole
2. South Pole
3. Equator
4. North and South Poles

The poles of the earth are

1. hotter than the rest of the earth
2. colder than the rest of the earth
3. denser than the rest of the earth
4. lighter than the rest of the earth

Air moves from the regions in 0-30 degrees latitude belt on either side of the equator towards the

1. North Pole
2. South Pole
3. Equator
4. North and South Poles

The regions close to the equator is

1. colder than the rest of the earth
2. hotter than the rest of the earth
3. smaller than the rest of the earth
4. larger than the rest of the earth

Convection in air means

1. movement of air from hotter place to colder place
2. transfer of heat from hotter place to colder place through air
3. movement of air from the place of higher air pressure to the lower one
4. movement of air from the place of lower air pressure to the higher one

Warm air

1. is heavier than cold air
2. moves from hotter place to colder place
3. does not exert pressure on its container
4. rises upward

Convection in air is set up due to

1. the difference in temperature in different regions
2. the same temperature in different regions
3. the same air pressure in different regions
4. the difference in constituents of air in different regions

Warm air becomes lighter

1. because it expands and occupies more space
2. because it contracts and occupies more space
3. because it expands and occupies less space
4. because it contracts and occupies less space

The difference in air pressure between two regions is caused due to

1. the difference in constituents of air in the two regions
2. the difference in temperature of the two regions
3. the same constituents of air in the two regions
4. the same temperature of the two regions

The greater the difference in air pressure,

1. the slower the water vapour moves
2. the slower the air moves
3. the faster the air moves
4. the greater is the tendency of air to be still

Air moves from the region of

1. high air pressure to the region of low air pressure
2. low air pressure to the region of high air pressure
3. high water pressure to the region of low water pressure
4. low water pressure to the region of high water pressure

Increased speed winds are accompanied by

1. increased air pressure
2. reduced air pressure
3. increased as well as reduced air pressure
4. increased water pressure

When water is boiled in a tightly covered can and cold water is poured on it with the lid still attached

1. the can will become larger in size
2. the can will get elongated
3. the can will get distorted
4. the lid will get blown away

It is easier to row a boat when wind is blowing from

1. the left side
2. the right side
3. the front
4. behind

Jasmine inflated a balloon with air. The balloon becomes larger in size because

1. of the wind blowing inside the balloon
2. of the pressure exerted by water particles inside the balloon
3. of the constituents of air inside the balloon
4. of the pressure exerted by air inside the balloon on its wall

Agriculture, transport, communication, and electric supply are

1. affected by cyclones
2. not affected by cyclones
3. improved by cyclones
4. the causes of cyclones

Wind is

1. moving water
2. non-moving water
3. moving air
4. non-moving air