Question

A box, when hung from a spring balance shows a reading of 50 kg. If the same box is hung from the same spring balance inside an evacuated chamber, the reading on the scale will be

• A. 50 kg because the mass of the box remains unchanged.
• B. 50 kg because the effect of the absence of the atmosphere will be identical on the box and the spring balance.
• C. Less than 50 kg because the weight of the column of air on the box will be absent.
• D. More than 50 kg because the buoyant force due to air will be absent.

Answer 1

The correct option is D

More than 50 kg because the buoyant force due to air will be absent.

No buoyant force acts in vacuum.