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GeographyEasyAsked in: SSC CHSL · 18 March 2020, Shift 2

The earthquake waves are recorded by an instrument called:

  1. A.Speedometer
  2. B.Odometer
  3. C.Richter scale
  4. D.Seismograph

Correct answer

D. Seismograph

Explanation

The correct answer is D, Seismograph. A seismograph, also called a seismometer, senses the shaking of the ground and draws it as a wavy line called a seismogram. A heavy mass hangs so that it stays almost still while the frame moves with the earth, and the difference between the two is recorded. From the gap between the arrival of the faster P waves and the slower S waves at three or more stations, scientists work out the epicentre, and from the size of the waves they work out the magnitude. Option A is wrong because a speedometer shows the speed of a vehicle. Option B is wrong because an odometer measures the distance a vehicle has travelled. Option C is wrong because the Richter scale is a scale, not an instrument: it puts a number on the energy of a quake using the readings a seismograph has already made, and each whole step means about 32 times more energy. Exam tip: seismograph records, Richter scale measures magnitude, Mercalli scale measures the damage felt.

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.