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Q97 (CAPF/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Astronomy and astrophysics

Consider the following statements regarding the rotation of the Earth: 1. Since the Earth rotates by 15° each hour, time zones normally differ by one hour 2. At the International Date Line, the calendar day changes – advancing a day for eastward travel, dropping back a day for westward travel 3. Daylight saving time advances the clock by one hour 4. The Moon rotates and revolves about the Earth in the same direction that the Earth revolves around the Sun Which of the statements given above is/are correct?

Result
Your answer: —  ·  Correct: C
Explanation

Statement 1 is correct as the Earth completes a 360° rotation in 24 hours, meaning it rotates 15° per hour, which forms the basis for one-hour time zone differences [1][2][3]. Statement 2 is incorrect because crossing the International Date Line (IDL) eastward requires dropping back a day (losing a day), while westward travel requires advancing a day (gaining a day) [5]. Statement 3 is correct; Daylight Saving Time involves advancing clocks by one hour during summer to better utilize sunlight [4]. Statement 4 is correct based on astronomical principles; the Moon rotates on its axis and revolves around the Earth in a prograde (counter-clockwise) direction, which is the same direction as the Earth's revolution around the Sun. Since statements 1, 3, and 4 are accurate, option 3 is the correct choice.

Sources

  1. [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 2: The Earth's Crust > Longitude and Time > p. 11
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 18: Latitudes and Longitudes > Longitude and Time > p. 243
  3. [3] Exploring Society:India and Beyond. Social Science-Class VI . NCERT(Revised ed 2025) > Chapter 1: Locating Places on the Earth > Understanding Time Zones > p. 20
  4. [5] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 2: The Earth's Crust > The International Date Line > p. 14
  5. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 19: The Motions of The Earth and Their Effects > Daylight Saving in Temperate Regions > p. 254
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