11) Which of the following describes Pressure Gradient Force? a. b. c. d. it cau

Question

11) Which of the following describes Pressure Gradient Force? a. b. c. d. it causes deflection of winds from a straight path it decreases with height above the surface it drives air flow from areas of low pressure to areas of high pressure it drives air from areas of high pressure to areas of low pressure 12) The elevation at which the bottoms of clouds begin to form represents the elevation at which: a. b. C. d. Dew point occurs Relative humidity reaches 100% Relative humidity reaches 0% Both A and B 13) Which of the following is NOT correctly matched? a. b. C. d. High altitude clouds - stratus Thunderstorm clouds-cumulonimbus Thin, wispy clouds-cirrus Puffy clouds-cumulus 14) Where on Lake Erie is a lake-effect snowfall LEAST likely to occur? a. The far eastern shore (Buffalo) b. The southeastern shore (Cleveland) C. The far western shore (Toledo) d. Lake effect snow doesn't occur on the shores of Lake Erie 15) A mT air mass is likely to be than a cP air mass because the mT air mass a. b. c. d. Wetter; forms over the ocean Drier; forms over the ocean Wetter; forms over land Drier; is a cold air mass

Explanation / Answer

11. Pressure gradient force drives air from areas of high pressure to areas of low pressure.

The difference in pressure between any two places is called pressure gradient. The direction of pressure gradient is considered from high pressure to decreasing pressure and the pressure direction is always perpendicular to isobars. The air moves from high pressure to low pressure.

12. The elevation at which the bottoms of clouds begin to form represents the elevation at which relative humidity reaches 100%.

Relative humdity is the ration of the amount of water actually present in the air having definite volume and temperature to the maximum amount thr air can hold at that volume and temperature.Clouds are formed due to condensation of water vapour around hygroscopic nuclei caused by cooling due to lifting of air generally known as adiabatic cooling.

13. Not correctly matched : High altitude cloud - Stratus.

Stratus clouds are dense, lowlying fog-like clouds of grey colour but are seldom close to the ground. They are composed of several uniform layers. When these clouds are associated with rains or snow, they are called nimbostratus clouds.

14. A lake-effect snowfall is least likely to occur on the far western shore (Toledo) of the Lake Erie.

The lake-effect snow zone of Lake Erie stretching from the eastern suburbs of Cleveland, Ohio to Buffalo, New York.

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