Tides occur in the oceans and seas due to which among the following

  1. Gravitational force of the Sun
  2. Gravitational force of the Moon
  3. Centrifugal force of the Earth

Select the correct answer using the codes given below.

[UPSC Civil Services Exam – 2015 Prelims]

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3


Answer: (d)

Explanation:

  • Tides refer to the regular rising and falling of sea levels.
  • They are mainly caused by the gravitational pull of the Moon, although the Sun’s gravitational pull and centrifugal force also have an effect.
  • Water movements caused by wind and atmospheric pressure changes are referred to as surges.
  • The force that generates tides is the difference between the gravitational pull of the Moon and the centrifugal force.
  • Tides can vary in frequency, direction, and movement depending on location and time.
  • They are classified based on frequency as semi-diurnal, diurnal, or mixed tides.
  • Spring tides occur when the Sun, Moon, and Earth are in a straight line, resulting in higher tidal heights.
  • Neap tides occur twice a month when the Moon and Sun are at right angles to each other, resulting in opposing forces that counteract each other.

Therefore, option (d) 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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