CBSE Class 11 Physics Mechanical Properties of Fluids MCQs

Question: Liquid pressure depends upon

a) height of the liquid column

b) directions

c) shape of the liquid surface

d) area of the liquid surface

Answer: height of the liquid column

Question: Hydraulic lifts and hydraulic brakes are based on

a) Pascal's law

b) Bernoulli's principle

c) Archimedes' principle

d) Stoke's law

Answer: Pascal's law

Question: According to archimedes' principle, loss of weight of a body immersed in a liquid is equal to

a) weight of the liquid displaced

b) weight of the total liquid

c) weight of the body

d) None of these

Answer: weight of the liquid displaced

Question: _________ and _________ play the same role in case of fluids as force and mass play in case of solids

a) Pressure and density

b) Thrust and volume

c) Thrust and density

d) Pressure and thrust

Answer: Pressure and density

Question: Pressure applied to enclosed fluid is

a) transmitted unchanged to every portion of the fluid and wall of containing vessel.

b) increased in proportion to the mass of the fluid and then transmitted

c) diminished and transmitted to wall of container

d) increased and applied to every part of the fluid

Answer: transmitted unchanged to every portion of the fluid and wall of containing vessel.

Question: The pressure at the bottom of a tank containing a liquid does not depend on

a) area of the bottom surface

b) nature of the liquid

c) height of the liquid column

d) acceleration due to gravity

Answer: area of the bottom surface

Question: Specific gravity of a body is numerically equal to

a) relative density of the body

b) density of body in water

c) weight of the body in water

d) weight of the body in air

Answer: relative density of the body

Question:  Assertion: A small iron needle sinks in water while a large iron ship floats.

Reason: The shape of iron needle is like a flat surface while the shape of a ship is that which makes it easier to float.

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question: Consider an iceberg floating in sea water. The density of sea water is 1.03 g/cc and that of ice is 0.92 g/cc. The fraction of total volume of iceberg above the level of sea water is near by

a) 11%

b) 8%

c) 3%

d) 1.8%

Answer: 11% 

Question: A block of ice floats on a liquid of density 1.2 in a beaker then level of liquid when ice completely melt

a) rises

b) remains same

c) lowers

d) None of these

Answer: rises