Discussion
Assertion (A) : Celestial bodies are responsible for the rhythmic change in the ocean water level.
Reason (R) : Centrifugal force created due to earth's revolution is responsible for the change in ocean water levels.
Which one of the following is correct ?
Answer: B
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Tides, the rhythmic rise and fall of sea level, are caused mainly by the gravitational pull of the moon and, to a lesser extent, the sun, so the assertion is true.
The reason is also true in that a centrifugal effect, arising from the revolution of the earth-moon system about its common centre, helps raise the tidal bulge on the side of the earth away from the moon. But it is only a component of the mechanism; the cause the assertion refers to is the attraction of the celestial bodies, so R is not the explanation of A.
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