(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

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Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction of velocity or both.Reason: Acceleration can be produced only by change in the magnitude of the velocity.

The correct option is C Assertion is correct but Reason is incorrectChange in the direction of the velocity also produces acceleration as in the case of circular motion. The change in the magnitude or direction of the velocity or both can produce acceleration.

Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction of velocity or both.
Reason: Acceleration can be produced only by change in the magnitude of the velocity.

The correct option is C Assertion is correct but Reason is incorrect
Change in the direction of the velocity also produces acceleration as in the case of circular motion. The change in the magnitude or direction of the velocity or both can produce acceleration.