Gravitation Test

Result

Gravitation Test - 6

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Question 1
1 / -0

A body floats in a liquid contained in a beaker. The whole system falls freely under gravity. The upthrust on the body due to the liquid is

A
zero

B
equal to the weight of the liquid displaced

C
equal to the weight of the body in air

D
equal to the weight of the immersed portion of the body

Solution

For a body falling freely under gravity, the effective value of g is zero. Hence, the upthrust is zero.
Question 2
1 / -0

In a capillary rise experiment, the water level rises to a height of 5 cm. If the same capillary tube is placed in water such that only 3 cm of the tube projects outside the water level, then

A
water will begin to overflow through the capillary

B
the angle of contact decreases

C
the angle of contact increases

D
the meniscus completely vanishes

Solution

For the capillary action, hR = constant

Where, h is the height to which the liquid rises in the capillary and R is the radius of the curvature.

If h is insufficient, then the radius of curvature will increase.