Q1 of 8 Page 92

Multiple choice question.

The direction of wind around a low pressure in northern hemisphere is:


The direction of wind is influenced by the Coriolis force, caused by the rotation of earth on its axis. This force deflects the winds towards the right in northern hemisphere, which leads to anti-clockwise circulation around a low-pressure zone.

All other options are incorrect.

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1

Multiple choice question.

If the surface air pressure is 1,000 mb, the air pressure at 1 km above the surface will be:


 1

Multiple choice question.

The Inter Tropical Convergence Zone normally occurs:


 1

Multiple choice question.

Which one of the following is the source region for the formation of air masses?


 2

Answer the following questions in about 30 words.

(i) What is the unit used in measuring pressure? Why is the pressure measured at station level reduced to the sea level in preparation of weather maps?


(ii) While the pressure gradient force is from north to south, i.e. from the subtropical high pressure to the equator in the northern hemisphere, why are the winds north easterlies in the tropics.


(iii) What are the geotrophic winds?


(iv) Explain the land and sea breezes.