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GeographyMediumAsked in: CTET · Paper II SST, 20 Aug 2023

If Greenwich Meridian Time is 12 noon, then what will be the time at 45° East longitude?

  1. A.9 a.m.
  2. B.3 p.m.
  3. C.10 a.m.
  4. D.2 p.m.

Correct answer

B. 3 p.m.

Explanation

The correct answer is B, 3 p.m. Places east of Greenwich are ahead in time, and every degree of longitude adds 4 minutes. The Earth turns through 360° in 24 hours, so it covers 15° in one hour, or 1° in 4 minutes. For 45° East the difference is 45 × 4 = 180 minutes, which is 3 hours. Because the place lies east of Greenwich, we add these 3 hours to 12 noon and get 3 p.m. The short rule is 'East gains, West loses'. A is wrong because 9 a.m. comes from subtracting 3 hours, which would be right only for 45° West. C is wrong because 10 a.m. would be the time at a place 30° West of Greenwich. D is wrong because 2 p.m. would be the time at a place only 30° East of Greenwich. Exam tip: 1° = 4 minutes and 15° = 1 hour; add time going east, subtract going west. India's Standard Meridian at 82½° E is 5 hours 30 minutes ahead of Greenwich.

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.