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Mechanical Properties Of Fluids Class 11 MCQs Questions with Answers
The height of a liquid in a fine capillary tube
(a) Increases with an increase in the density of a liquid
(b) Decreases with a decrease in the diameter of the tube
(c) Decreases with an increase in the surface tension
(d) Increases as the effective value of acceleration due to gravity is decreased
Answer: (d) Increases as the effective value of acceleration due to gravity is decreased
Water rises up to a height h, in a capillary tube of radius r. the mass of the water lifted in the capillary tube is M. if the radius of the capillary tube is doubled, the mass of water that will rise in the capillary tube will be
(a) M
(b) 2M
(c) M/2
(d) 4M
Answer: (b) 2M
One end of a towel dips into a bucket full of water and other end hangs over the bucket. It is found that after some time the towel becomes fully wet. It happens
(a) Because viscosity of eater is high
(b) Because of the capillary action of cotton threads
(c) Because of gravitational force
(d) Because of evaporation of water.
Answer: (b) Because of the capillary action of cotton threads
5 g of water rises in the bore of capillary tube when it is dipped in water. If the radius of bore capillary tube is doubled, the mass of water that rises in the capillary tube above the outside water level is
(a) 1.5 g
(b) 10 g
(c) 5 g
(d) 15 g
Answer: (b) 10 g
The surface of water in contact with glass wall is
(a) Plane
(b) concave
(c) convex
(d) Both b and c
Answer: (b) concave
A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop
(a) Increases
(b) Is infinite
(c) Remains unchanged
(d) May decrease or increase depending upon size
Answer: (d) May decrease or increase depending upon size
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: (a) 11%
Surface tension of a soap solution is 1.9 × 10-2N/m. work done in blowing a bubble of 2.0 cm diameter will be
(a) 7.6 × 10-6 p J
(b) 15.2 × 10-6 p J
(c) 1.9 × 10-6 p J
(d) 1 × 10-4 p J
Answer: (b) 15.2 × 10-6 p J
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: (a) Assertion is correct, reason is incorrect
A capillary tube when immersed vertically in a liquid records a rise of 3 cm. if the tube is immersed in the liquid at an angle of 60° with the vertical, then length of the liquid column along the tube will be
(a) 2 cm
(b) 3 cm
(c) 6 cm
(d) 9 cm
Answer: (c) 6 cm
When the angle of contact between a solid and a liquid is 90°, then
(a) Cohesive force > Adhesive force
(b) Cohesive force < Adhesive force
(c) Cohesive force = Adhesive force
(d) Cohesive force >> Adhesive force
Answer: (c) Cohesive force = Adhesive force
Pressure inside two soap bubbles is 1.01 and 1.02 atmospheres. ratio between their volume is
(a) 102 : 101
(b) (102)3 : (101)3
(c) 8 : 1
(d) 2 : 1
Answer: (c) 8 : 1
Choose the wrong statement from the following.
(a) Small droplets of a liquid are spherical due to surface tension
(b) Oil rises through the wick due to capillarity
(c) In drinking the cold drinks through a straw, we use the phenomenon of capillarity
(d) Gum is used to stick two surfaces. In this process we use the property of Adhesion
Answer: (c) In drinking the cold drinks through a straw, we use the phenomenon of capillarity
At critical temperature, the surface tension of a liquid
(a) Is zero
(b) Is infinity
(c) Is the same as that at any other temperature
(d) Can not be determined
Answer: (a) Is zero
One end of a towel dips into a bucket full of water and other end hangs over the bucket. It is found that after some time the towel becomes fully wet. It happens
(a) Because viscosity of eater is high
(b) Because of the capillary action of cotton threads
(c) Because of gravitational force
(d) Because of evaporation of water.
Answer: (b) Because of the capillary action of cotton threads
For tap water and clean glass, the angle of contact is
(a) 0°
(b) 90°
(c) 140°
(d) 8°
Answer: (d) 8°
Sudden fall in the atmospheric pressure by a large amount shows
(i) rain
(b) fair weather
(c) cloud wave
(d) storm
Answer: (d) storm
Hot syrup flows faster because its
(a) surface tension increases
(b) surface tension decreases
(c) viscosity decreases
(d) viscosity increases
Answer: (c) viscosity decreases
In streamlined flow, the velocity of the liquid in contact with the containing vessel is
(a) zero
(b) minimum but not zero
(c) infinite
(d) large
Answer: (a) zero
A liquid is kept in a glass vessel. If the liquid solid adhesive force between the liquid and the vessel is very weak as compared to the cohesive force in the liquid, then the shape of the liquid surface near the solid should be
(a) Concave
(b) Convex
(c) Horizontal
(d) Almost vertical
Answer: (b) Convex
—— 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: (a) Pressure and density
Water rises up to a height of 5 cm in a capillary tube of radius 2 mm. what is the radius of the radius of the capillary tube if the water rises up to a height of 10 cm in another capillary?
(a) 4 mm
(b) 1 mm
(c) 3 mm
(d) 1 cm
Answer: (b) 1 mm
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: (a) area of the bottom surface
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: (a) rises
Water rises up to a height of 4 cm, in a capillary tube immersed vertically in water. What will be the length of water column in the capillary tube, if the tube is immersed in water, at an angle of 60° with the vertical?
(a) 4 cm
(b) 6 cm
(c) 8 cm
(d) 2 cm
Answer: (c) 8 cm
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