A box when hung from a spring balance shows a reading of 50 ,kg . If same box is hung from same spri

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4-1.Newton's Laws of Motion

hard

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 atmospheric buoyancy force will be absent

(KVPY-2014)

Solution

(d)

In an evacuated chamber, buoyant force of air is absent, so reading of spring balance is more than $50 \,kg$.

Standard 11

Physics

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