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GeographyEasyAsked in: SSC MTS · 5 Oct 2021, Shift 2

Which of the following is the closest layer to the Earth's surface in which all weather occurs?

  1. A.Mesosphere
  2. B.Troposphere
  3. C.Ionosphere
  4. D.Stratosphere

Correct answer

B. Troposphere

Explanation

The correct answer is B, Troposphere. The troposphere is the lowest layer of the atmosphere, lying right above the Earth's surface, and nearly all weather happens in it. It reaches about 18 km over the equator and about 8 km over the poles, and it holds roughly three quarters of the mass of the air along with almost all the water vapour and dust. Because this layer is heated from the ground upwards, the temperature falls with height by about 6.5 degrees Celsius per kilometre, which keeps the air churning and makes clouds, rain, storms and winds possible. Its upper limit is called the tropopause. A is wrong because the mesosphere lies above the stratosphere and is the layer where meteors burn up. C is wrong because the ionosphere is far higher and reflects radio waves back to Earth. D is wrong because the stratosphere holds the ozone layer and has calm air that jet aircraft use. Exam tip: troposphere, stratosphere, mesosphere, thermosphere, exosphere, from the ground upwards.

Practice Questions

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Q2.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.

  1. A.2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 2 and 3 only

Himalayan rivers are perennial, so statement 1 is wrong, while statements 2 and 3 are correct. Himalayan rivers such as the Ganga, Indus and Brahmaputra rise from glaciers and snowfields and also get monsoon rain, so they flow all year round, including in winter.

Q3.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements related to latitude are true? 1. Rainfall, temperature and vegetation vary with latitude. 2. The difference between the longest day and the shortest day increases with latitude. 3. Indira Point is located approximately at 6°45' N latitude. Select the correct answer using the code given below.

  1. A.1 and 2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three statements about latitude are true. Latitude decides how directly the Sun's rays strike a place, so temperature, rainfall and the type of vegetation change from the equator towards the poles, from hot, wet rainforests to cold tundra.

Q4.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following lakes is/are situated in Ladakh? 1. Tso Kar 2. Pangong Tso 3. Tsomgo 4. Tso Moriri Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3
  3. C.1, 2 and 4
  4. D.2 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

Tso Kar, Pangong Tso and Tso Moriri are high-altitude lakes of Ladakh, while Tsomgo lies in Sikkim. Pangong Tso, at about 4,350 metres, is a long, narrow lake that stretches from Ladakh into Tibet, and most of its length lies on the Chinese side.