I. They are formed due to disturbances in planetary pressure system.
II. They are in form of vertical circulation cells.

I. Pressure gradient
II. Frictional force
III. Coriolis force
Select the correct answer using the codes given below.

I. meeting of cumulonimbus clouds in the sky.
II. lightning that separates the nimbus clouds.
III. violent upward movement of air and water particles.
Select the correct answer using the codes given below.

I. The Doldrums is a low pressure area around Equator where the prevailing winds are calm.
II. Chinook is a hot and dry wind that blows in winter and therefore raises the temperature in a short time.
Which of the statements given above is/are correct?

I. It is defined as sudden localised very heavy downpour with cloud thunder and lightning.
II. It mostly occurs in the hilly areas.
III. It results into very high intensity of rainfall, i.e. 250 mm - 300 mm in a couple of hours.
IV. It occurs only during day time.
Select the correct answer using the codes given below.

I. They are strong Westerly winds found in the oceans of Southern Hemisphere.
II. The strong East to West air currents are caused by the combination of air being displaced from the Equator towards the South Pole and the Earth’s rotation and abundance of landmasses to serve as wind breaks.
Which of the statements given above is/are correct?

I. The difference between the moisture-holding capacity of air and its actual humidity is called saturation deficit.
II. The temperature to which air has to be cooled in order to reach saturation is called dew point.
Which of the statements given above is/are correct?

I. All storms and cloudiness are restricted to stratosphere.
II. Cirrus clouds are formed on the top layers of troposphere.
III. Stratosphere is also an ‘isoclinal layer’.
Which of the statements given above is/are correct?

I. An unsaturated air mass cools at dry adiabatic lapse rate when it rise in the atmosphere.
II. The dry adiabatic lapse rate amounts to 1°C per 100 m.
III. The wet adiabatic lapse rate may vary between 0.4°C and 0.9°C per 100 m.
IV. Dry adiabatic lapse rate is higher because of the release of latent heat of condensation.
Which of the statements given above are correct?

I. Condensation
II. High temperature and humidity
III. Orography
IV. Vertical wind
The thunder cloud development is due to which of these phenomena?

I. Southern Hemisphere as compared to Northern hemisphere has less landmass.
II. Coriolis force is higher in Southern hemisphere, as compared to Northern hemisphere.
Which of the statements given above is/are correct?