The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?

  1. There are no clouds or water vapour in the lower stratosphere.
  2. There are no vertical winds in the lower stratosphere.

Which of the statement(s) given above is/are correct in this context?

[UPSC Civil Services Exam – 2011 Prelims]

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2


Answer: (c)

Explanation:

  • Aeroplanes fly in the stratosphere mainly due to the presence of minimal turbulence in this layer of the atmosphere, which results in better fuel efficiency.
  • The lower air resistance in higher altitudes, especially the stratosphere, reduces the resistance by almost 50% compared to the ground, allowing the plane to maintain airspeed with lower power settings.
  • Clouds are confined to the troposphere, and the stratosphere is relatively dry, with limited vertical transfer due to high stability and low saturation vapour pressure across the tropopause.
  • Due to the temperature increase with height in the stratosphere, the air in this region is stable, and vertical winds are rare. Therefore, both statement 1 and 2 are correct.

Therefore, option (c) is the correct answer.

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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