Miscellaneous (World Geography) Part-3

Total Questions: 45

19. Consider the following climatic and geographical phenomena: [I.A.S. (Pre) 2002]

1. Condensation

2. High temperature and humidity

3. Orography

4. Vertical wind

Thunder clouds development is due to which of these phenomena?

Correct Answer: (c) 1, 2 and 4
Solution:Thunder cloud is a process of a thunderstorm. In fact, thunderstorms are a local lightning storm that develops in hot, humid tropical areas like India very frequently. The rising temperature produces strong upward rising winds.

These winds carry water droplets upwards, where they freeze(condense), and fall down again. The swift movement of the falling water droplets along with the rising air creates lightning and sound. So it is clear that except Orography, all are related to thunder clouds.

20. During a thunderstorm, the thunder in the sky is produced by the - [I.A.S. (Pre) 2013]

1. meeting of cumulonimbus clouds in the sky.

2. lightning that separates the nimbus clouds.

3. violent upward movement of air and water particles.

Select the correct answer using the code given below

Correct Answer: (d) None of the above
Solution:During a thunderstorm, thunder is the sound caused by a lightning discharge. Lightning heats the air in its path and causes a large over-pressure of the air within its channel.

The channel expands supersonically into the surrounding air as a shockwave and creates an acoustic signal that is heard as thunder. Hence none of the above options is correct.

21. In the context of which of the following do some aurscientists suggest the use of cirrus cloud thinning technique and the injection of sulphate aerosol into stratosphere? [I.A.S. (Pre) 2019]

Correct Answer: (a) Creating the artificial rains in some regions
Solution:Scientists are researching climate engineering to reduce global warming. A major technique related this is the cirrus cloud rarefaction technique. Cirrus clouds are icy crystals of water vapour, which prevent heat reflected from the ground from escaping into other space.

By spraying bismuth triiodide or silver Iodide on these clouds it, become sparse. As a result of their rarefaction, their heat absorption capacity is reduced, due to which the terrestrial radiation will go comparatively more into space and thus the Global Warming will be reduced.

Similarly, under another proposed geoengineering technique, spraying of sulfate aerosols in the stratosphere would create a layer, which would reflect some amount of solar radiation before reaching the Earth's Troposphere, thereby reducing radiation on Earth will be achieved and thus global warming will be reduced.

22. Why are dewdrops not formed on a cloudy night? [I.A.S. (Pre) 2019]

Correct Answer: (b) Clouds reflect back the Earth's radiation.
Solution:The most suitable conditions for dew formation are cler sky, clam air, high relative humidity and cool and long nights. With higher temperature during the day, the water holding capacity of the air increases, due to which the amount of water vapour (humidity) in the air increases.

On the con- trary, when the temperature becomes very low at night, the water-holding capacity of the air decreases due to which more water vapour from the saturated air condenses in the from of drops on the cold surface, which is called 'dew'.

But when clouds cover the night sky, they reflect back Earth's radition, keeping the air and surface warm. Due to this the diurnal temperature difference is less and  does not form.

23. Match List-I with List-II and select the correct answer using the codes given below the lists. [LA.S. (Pre) 2001]

List-I (Local Wind)List-II (Region)
A. FoehnArgentina
B. SimoomKurdistan
C. Santa AnaCalifornia
D. ZondaAlps

Code:

ABCD
(a)2413
(b)4231
(c)2431
(d)4213
Correct Answer: (b)
Solution:Foehn-A warm dry wind blowing down the northern slopes of the Alps. It most influences the weather of Switzerland. Simoom-Strong, dry wind that blows in the desert of Arabia and Kurdistan.

Santa Ana-The local wind of southern California

Zonda -The local wind blows on the eastern slope of the Andes in Argentina.

24. 'Foehn' is a local wind of [U.P.U.D.A./L.D.A. (Pre) 2010]

Correct Answer: (d) Switzerland
Solution:Foehn-A warm dry wind blowing down the northern slopes of the Alps. It most influences the weather of Switzerland. Simoom-Strong, dry wind that blows in the desert of Arabia and Kurdistan.

Santa Ana-The local wind of southern California

Zonda -The local wind blows on the eastern slope of the Andes in Argentina.

25. Which one of the following pairs is not correctly matched? [U.P.P.C.S. (Pre) 2016]

Local WindRegion
(a)FoehnAlps Mountain
(b)BoraPoland
(c)MistralRhine Valley
(d)KhamsinEgypt
Correct Answer: (b)
Solution:Bora is a dry, cold and fast blowing wind on the eastern coast of Adriatic Sea. The northern part of Italy is particularly influenced by this wind. Thus, option (b) is not correctly matched. Other options are correctly matched.

26. Which one of the following is not correctly matched? [U.P.P.C.S. (Pre) 2005]

Correct Answer: (c) Blizzard-Chile
Solution:Chinook-It is a local wind that blows in the east of Rockies mountain, USA and Canada.

Sirocco- wind blows from the Sahara desert toward the north-east direction of the Mediterranean Sea and enters Sicily (Italy), Spain and other European regions/countries.

Blizzard- A blizzard is a long-lasting snowstorm with very strong winds and intense snowfall. It flows through South Pole, Siberia, Canada, and the U.S.A. Chile does not fall on its way.

Norwester - It is a pre-monsoon thunderstorm of India also called 'Kalbaisakhi.

27. Which one of the following locations has "Blood Rain". [U.P. Lower Sub. (Pre) 1998]

Correct Answer: (a) Italy
Solution:Sirocco is a warm, dry and dusty wind blowing from Sahara desert to the Mediterranean Sea. This wind carries red sand with it. This wind sometimes causes rain in Itlay. When the red sand falls on earth with the raindrops, it is called Blood Rain.