Class 7

Consider the following statements and choose the correct one:

• The layer of earth above the earth is called atmosphere.

• About 99% of atmosphere is made up of just 2 gases nitrogen and oxygen.

• The atmosphere exerts a pressure called atmospheric pressure due to the weight of air contained in it.

• All of these.

Following are the precautions one must take in case a storm in accompanied by lightning. Which one of these is not correct?

• Do not take shelter under tree.

• Do not take shelter in a bus in open.

• Do not take shelter under umbrella with a metallic end.

• Do not take shelter in open garages, storage sheds, etc.

Which of the given statements is incorrect

• Atmospheric pressure acts in downwards direction.

• We go to higher altitude the atmospheric pressure goes on decreasing.

• The football gets inflated because the air filled in its exerts pressure.

• None of these.

which of the following statements is correct

• Warm air is lighter than cool air.

• The coastline of India is not vulnerable to cyclones.

• Avery high-pressure system with very high-speed wind surrounding it forms a cyclone.

• If wind flows from land to the ocean, then it is daytime.

Which of the following statement is correct

• Air expands on heating.

• Hot air is lighter than cold air.

• Smoke always rises up.

• All of the above.

Cyclones cause widespread destruction and loss of life in Coastal Areas:

• By producing extreme high-speed winds.

• By lifting the sea-water several meters high.

• By bringing torrential rains.

• All of the above.

The centre of a Cyclonic Storm called the 'Eye Of Cyclone' is an area of:

• Moderate air pressure.

• Very high air pressure.

• Very low air pressure.

• Gradually rising air pressure.

Wind is always associated with:

• Chemical Energy

• Kinetic Energy

• Potential Energy

• Gravitational Energy

Precautions should not be taken during a thunderstorm

• We should not sit near window during lightning.

• Open garages, storage sheds are safe place to take shelter during lightning.

• We should not take shelter under an isolated and tall tree.

• A car or a bus is a safe place to take shelter during lightning.

Read the following statements carefully and choose the incorrect one:

• Tornado lifts people and vehicles off the ground and hurls them hundreds of metres away.

• The wind speed in a tornado may reach up to 300 kilometres per hour.

• Tornado causes much damage from the sheer force of its high-speed wind.

• Tornado is a silent storm with O-shaped dark column of rotating winds and clouds that reaches from sky to the ground.