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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

1 Medium

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Analyzing +4 | -1

Given below are two statements: one is labelled as
Assertion A and the other is labelled as Reason R

Assertion A : A spherical body of radius

\left( {5 \pm 0.1} \right)\,\,{\text{mm}}

having a particular density is falling through a
liquid of constant density. The percentage error in
the calculation of its terminal velocity is 4%.

Reason R : The terminal velocity of the spherical
body falling through the liquid is inversely
proportional to its radius.

In the light of the above statements, choose the
correct answer from the options given below

View answer and explanation

Correct option: C

A is true but R is false

Option C is correct. The percentage error in terminal velocity is indeed 4%, but the terminal velocity is proportional to the square of the radius, not inversely proportional.

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