Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 10 PCB MCQ (Single Correct)

Consider the following statements about Stoke's law:

A
It states that viscous force is directly proportional to the square of the velocity.
A and B only
B
It states that the viscous force is proportional to viscosity of the fluid and radius of the object.
B and D only
C
The terminal velocity of a sphere in fluid depends only on the density of sphere.
A, B and D only
D
At the terminal velocity, weight is equal to the sum of buoyancy force and viscous force of the object.
Correct statement/statements are:
C and D only

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The correct answer is:
B

According to Stoke's law, the viscous force ( ) is

The terminal velocity ( ) of a sphere in a fluid is

Therefore, at terminal velocity,

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