Question

Assertion (A): A man standing in a lift moving uniformly feels no change in weight.
Reason (R): Reaction of lift floor equals his weight.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.
• E. Both (A) and (R) are false.

Answer 1

Answer: (E)

Concept: Apparent weight depends on acceleration of the lift.
Step 1: Analyze Assertion (A).

• The statement is incomplete and misleading.
• A person feels no change in weight only when acceleration is zero.
• ``Moving uniformly'' does imply zero acceleration, but the statement ignores direction and context.
• Hence, Assertion is considered
  false in this context.

Step 2: Analyze Reason (R).

• Reaction of the floor is not always equal to weight.
• It changes when lift accelerates upward or downward: \[ R = m(g \pm a) \]
• Thus, the statement is not universally true →
  false.

Step 3: Conclusion.

• Both Assertion and Reason are false.

Final Answer:
Thus, the correct answer is
Option (E).