Question

A container, filled with water and having a wooden block floating on it, is allowed to fall freely under gravity. During the fall, the upthrust on the wooden block will be

• A. Equal to the weight of block in air
• B. Equal to weight of water displaced by the portion of the block
• C. Equal to loss of weight of the block in water
• D. Zero

Answer 1

The correct option is D

Zero

Explanation for the correct answer:

Option (D): Zero

• The effective weight of block becomes zero, as it is in state of weightlessness.
• For a floating body the net weight is equal to zero as the upthrust balances the actual weight of the body, when the free fall of the beaker occur than the up thrust becomes zero.

Hence, correct option is (D).