Question

Fill the blank.

When a spherical body is allowed to fall through viscous medium its velocity increases, till the sum of viscous drag and upthrust is equal to ________.

• A. Height of the body
• B. Weight of the body
• C. Nature of the body
• D. Volume of the body

Answer 1

The correct option is B Weight of the body

Weight of the body is balanced by the viscous drag and upthrust acting on the body so that the spherical body falls at constant rate through the viscous medium.

$\therefore$ Weight = Viscous drag force + upthrust