Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Tides indicate the regular and periodic rise and fall in sea level.
Reason (R): Tides are caused by the gravitational pull of moon and earth.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Tides are caused by the gravitational pull of the Moon and the Sun (plus centrifugal force), not by the Earth's own gravity, so (R) is wrong while (A) is right.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:

• This is an Assertion-Reason question on ocean tides.
• We must judge whether (A) is correct, whether (R) is correct, and whether (R) explains (A).

Step 2: Detailed Explanation:

• Assertion (A): Tides are the regular, periodic rise and fall of sea level, generally once or twice a day. So (A) is correct.

• Reason (R): Tides are generated mainly by the gravitational attraction of the Moon (and, to a smaller extent, the Sun) acting on the oceans, together with the centrifugal force due to the Earth-Moon revolution. The statement that tides are caused by the gravitational pull of the 'moon and earth' is therefore not an accurate cause, since the Earth's own gravity only holds the water to the planet and does not generate tides. So (R) is not correct.

• Hence (A) is correct but (R) is not correct.

Step 3: Final Answer:
The correct option is (C) (A) is correct but (R) is not correct.