The layer of the atmosphere which provides ideal conditions for flying on jet aeroplanes is ________
A. Troposphere
B. Stratosphere
C. Ionosphere
D. Exosphere
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Because of which one of the following factors, clouds do not precipitate in deserts?
A. Low pressure
B. Low humidity
C. High wind velocity
D. High temperature
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Which one among the following local winds is not characteristically hot and dry?
A. Sirocco
B. Mistral
C. Khamsin
D. Chinook
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Which one of the following characteristics is not associated with the tropical cyclones?
A. Before the cyclone arrives the air becomes very still and temperature and humidity are high
B. As the front of the vertex arrives, gusty winds develop and thick clouds appear
C. As the cold front passes, the weather changes very rapidly
D. Calm conditions return when the eye of the cyclone arrives
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In the atmosphere of the primitive earth there was no ________
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Ammonia
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Winds and air currents differ in the aspect that ________
A. Air currents blow much faster than winds
B. Air currents are always moisture laden while the winds are usually dry
C. The winds blow on lands while air currents blow over seas and oceans
D. Winds are horizontal movements of air while air currents are the vertical movements of air
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Lapse rate is related to the decrease of ________
A. Wind velocity with an ascent of 300 feet
B. Humidity with an ascent of 450 feet
C. Temperature at 1°F for an ascent of 330 feet
D. Pressure with an ascent of 500 feet
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The most abundant element in the Earth's atmosphere is
A. Argon
B. Nitrogen
C. Oxygen
D. Krypton
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A temperature inversion is most likely to occur under which of the following conditions?
A. Mountain top in late evening
B. Windy but cloudy night
C. Calm, cloudy and humid night
D. Calm, clear and cool winter night
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The final boundary between the Earth and the outer space is called
A. Magnetosphere
B. Ionosphere
C. Mesopause
D. Magnetopause
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What helps to maintain the heat budget on the surface of the earth?
A. Incoming insolation in short waves and terrestrial radiation in long waves
B. The atmosphere absorbs heat
C. Incoming solar radiation is reflected
D. The earth absorbs heat
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Which of the following is not one of the three processes involved in the transfer of water between the atmosphere and the surface of the Earth?
A. Insolation
B. Evaporation
C. Condensation
D. Precipitation
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Which gas is found in maximum quantity in lower atmosphere?
A. Hydrogen
B. Carbon dioxide
C. Oxygen
D. Nitrogen
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Relative humidity of the atmosphere is directly affected by ________
A. Change in atmospheric pressure
B. Change in atmospheric temperature
C. Change in the direction of winds
D. None of these
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Which of the following statements about Stratosphere is incorrect?
A. It is the region in the atmosphere above tropopause
B. It contains ozone layer which prevents ultraviolet radiations of sun from reaching to the earth
C. It is not free from the violent weather changes occurring on the earth
D. It provides ideal flying conditions
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Cloud burst means ________
A. Abnormally heavy downpour of rain, associated with a thunderstorm
B. Formation of artificial rain
C. Presence of scattered flakes of cloud in the sky
D. Sowing of seeds of a crop in a cloudy weather
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Which of the following is located at the minimum height from the Earth?
A. Stratosphere
B. Mesosphere
C. Thermosphere
D. Troposphere
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Beaufort Scale is used to measure ________
A. Air pressure
B. Wind velocity
C. Wind direction
D. Humidity
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Which of the following depletion results in the increase in the UV radiation on the Earth?
A. Carbon monoxide
B. Carbon dioxide
C. Ozone
D. Oxygen
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Consider the following statements:
1. Nearly 99% of the total mass of the atmosphere lies within 30 km of the Earth's surface.
2. The proportion of ozone in the atmosphere increases to a maximum at about 60 km from Earth's surface.
Which of the statements given above is/are correct?
A. 1 only
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2
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