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ICSE Class 9 Geography Question 11 of 25

Rotation and Revolution — Question 23

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Question

Question 23

Assertion (A): Phenomena of dawn and dusk is experienced more in temperate regions.

Reason (R): The twilight continues as long as sun is 18° below the horizon.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R does not explain A.
  3. A is true but R is false.
  4. A is false but R is true.
Answer

Both A and R are true and R is the correct explanation of A.

Explanation — The twilight continues as long as sun is 18° below the horizon. In temperate regions, the angle at which the sun rises and sets is more slanted, so it takes longer to reach 18° below the horizon, hence longer dawn and dusk.