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GeographyMediumAsked in: SSC MTS · 11 May, 2023, Shift 3

Presence of which phenomenon leads to weakening of trade winds in a region?

  1. A.Coriolis force
  2. B.Mango Shower
  3. C.El Nino
  4. D.La Nina

Correct answer

C. El Nino

Explanation

The correct answer is C, El Nino. El Nino is the warming of the surface water of the central and eastern Pacific, and it weakens the trade winds that normally blow from east to west across that ocean. In normal years those winds push warm water towards Australia and Indonesia, letting cold water rise along the coast of Peru. When the pressure pattern flips, the winds slacken or even reverse, warm water spreads east, and the upwelling off South America stops, which hurts the anchovy catch. El Nino usually means a weaker monsoon and drier conditions over India. Option A is wrong because the Coriolis force, caused by the earth's rotation, only deflects winds and does not weaken them. Option B is wrong because a Mango Shower is a local pre-monsoon rain of Kerala and Karnataka. Option D is wrong because La Nina is the opposite phase, with cooler Pacific water and stronger trade winds. Exam tip: El Nino means warm Pacific, weak trade winds and a weak Indian monsoon; La Nina is the reverse on all three.

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.