Available Answers

1. 1.

   Check point:

   1. Which is not a characteristic of air?
      1. Air exerts pressure
      2. Air contracts on heating
      3. Warm air is lighter than cold air
      4. Air has weight
   2. Low atmospheric pressure exists on the Earth in which of the following latitudes?
      1. At the equator only
      2. At the poles
      3. At 30° N and S
      4. At the equator and at 60° N and S
   3. Which plays major role in the formation of thunderstorm?
      1. Conduction
      2. Convection
      3. Radiation
      4. None of these
   4. Which is not associated with cyclones?
      1. Strong winds
      2. Tidal waves
      3. Volcanic eruptions
      4. None of these
   5. This is used to measure the speed of the wind.
      1. Thermometer
      2. Stethoscope
      3. Anemometer
      4. Lever
   6. Which should not be done during thunderstorms?
      1. Shutting windows and doors tightly
      2. Sitting inside a car
      3. Coming out of water and going inside a building
      4. Taking shelter under an umbrella with a metallic end.
2. 2.

   True-False:

   1. In winters, the winds blow from the land to the ocean.
   2. Full form of CDRs is Cyclone Detection Radars.
   3. High speed winds are accompanied by increased air pressure.
   4. Winds are caused due to change in temperature and pressure in the air.
   5. Air moves from a region of low pressure to high pressure.
3. 3.

   Fill in the blanks:

   1. Air exerts _____________.
   2. Monsoon winds flow because of uneven heating of land and _____________.
   3. Winds that carry a lot of moisture are called _____________ winds.
   4. Cyclones are also known as _____________ and _____________.
   5. A thunderstorm is a storm accompanied by _____________, _____________ and _____________.
   6. Near the Earth's surface _____________ air rises up whereas _____________ comes down.
   7. The centre of a cyclone is called an _____________.
4. 4.

   What is thunderstorm?
5. 5.

   Define the term tornado.
6. 6.

   What do you mean by an eye of a cyclone?