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Standard XII

Physics

Variation of G Due to the Rotation of Earth

Assertion :An...

Question

Assertion :An object may fall with a constant velocity. Reason: This happens when acceleration of the object is equal to acceleration due to gravity

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Velocity of fall becomes constant when downward force due to acceleration is balanced by an upward force of retardation. This constant velocity of an object is known as terminal velocity.

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Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :An object may fall with a constant velocity. Reason: This happens when acceleration of the object is equal to acceleration due to gravity

The correct option is C Assertion is correct but Reason is incorrectVelocity of fall becomes constant when downward force due to acceleration is balanced by an upward force of retardation. This constant velocity of an object is known as terminal velocity.

The correct option is C Assertion is correct but Reason is incorrect
Velocity of fall becomes constant when downward force due to acceleration is balanced by an upward force of retardation. This constant velocity of an object is known as terminal velocity.