JEE Questions for Physics Mechanical Properties Of Fluids Quiz 6 - MCQExams.com

The action of a nib split at the top is explained by
  • Gravity flow
  • Diffusion of fluid
  • Capillary action
  • Osmosis of liquid
If capillary experiment is performed in vacuum then for a liquid there
  • It will rise
  • Will remain same
  • It will fall
  • Rise to the top
If liquid level falls in a capillary then radius of capillary will
  • Increase
  • Decrease
  • Unchanged
  • None of these
A cork is submerged in water by a spring attached to the bottom of a bowl. When the bowl is kept in an elevator moving with acceleration downwards, the length of spring
  • Increases
  • Decreases
  • Remains unchanged
  • None of these
A hollow sphere of volume V is floating on water surface with half immersed in it.
  • V/2
  • V/3
  • V/4
  • V
A ball whose density is 0.4 × 104 kg/m3 falls into water from a height of 9 cm.To what depth does the ball sink
  • 9 cm
  • 6 cm
  • 4.5 cm
  • 2.25 cm
A piece of solid weighs 120 g in air , 80 g in water and 60g in a liquid.The relative density of the solid and that of the liquid are respectively
  • 3,2
  • 2,3/4
  • 3/2,2
  • 3,3/2
A block of aluminium of mass 1 kg and volume 3.6 × 10-4 m3 is suspended from a string and then completely immersed in a container of water. The decrease in tension in the string after immersion is
  • 9.8 N
  • 6.2 N
  • 3.6 N
  • 1.0 N
If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake, then what is the depth of the lake?
  • 10 m
  • 20 m
  • 60 m
  • 30 m
The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill.
  • 250 m
  • 2.5 m
  • 1.25 km
  • 750 m
The pressure at the bottom of a tank containing a liquid does not depend on
  • Acceleration due to gravity
  • Height of the liquid column
  • Area of the bottom surface
  • Nature of the liquid
The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake is
  • 5 m
  • 10 m
  • 15 m
  • 20 m
Streamline flow is more likely for liquids with
  • High density and low viscosity
  • Low density and high viscosity
  • High density and high viscosity
  • Low density and low viscosity
A body weights 50g in air and 40 g in water. How much would it weigh in a liquid of specific gravity 1.5 ?
  • 65 g
  • 45 g
  • 30 g
  • 35 g
A barometer tube reads 76 cm of mercury. If the tube is gradually inclined at an angle of 60o with vertical, keeping the open end immersed in the mercury reservoir, the length of the mercury column will be
  • 152 cm
  • 76 cm
  • 38 cm
  • 38√3 cm
A triangular lamina of area A and height h is immersed in a liquid of density ρ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is

  • Physics-Mechanical Properties of Fluids-78610.png
  • 2)
    Physics-Mechanical Properties of Fluids-78611.png

  • Physics-Mechanical Properties of Fluids-78612.png

  • Physics-Mechanical Properties of Fluids-78613.png
An open U-tube contains mercury.When 11.2 cm of water is poured into one of the arms of the tube,how height does the mercury rise in the other arm form its initial level ?
  • 0.56 cm
  • 1.35 cm
  • 0.41 cm
  • 2.32 cm
With rise in temperature, density of a given body changes according to one of the following relations
  • ρ = ρ0 [1 + γ dθ]
  • ρ = ρ0 [1 - γ dθ]
  • ρ = ρ0 γ dθ
  • ρ = ρ0 / γ dθ
A cube floats in water with 1/3rd parts is outside the surface of water and it floats in liquid with 3/4th part is outside the liquid, then the density of liquid is
  • 8/3
  • 2/3
  • 4/3
  • 5/3
From the adjacent figure, the correct observation is
Physics-Mechanical Properties of Fluids-78618.png
  • The pressure on the bottom of tank (A) is greater than at the bottom of (B)
  • The pressure on the bottom of the tank (A) is smaller than at the bottom of (B)
  • The pressure depend on the shape of the container
  • The pressure on the bottom of (A) and (B) is the same
A body floats in water with 40% of its volume outside water. When the same body floats in oil, 60% of its volume remains outside oil. The relative density of the oil is
  • 0.9
  • 1.2
  • 1.5
  • 1.8
The pressure on a swimmer 20 m below the surface of water at sea level is
  • 1.0 atm
  • 2.0 atm
  • 2.5 atm
  • 3.0 atm

Physics-Mechanical Properties of Fluids-78621.png
  • √2
  • 1/√2
  • √2 - 1
  • 1/√2-1
A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is
  • 10
  • 20
  • 25.5
  • 5
The rate of flow of water in a capillary tube of length l and radius r is V. The rate of flow in another capillary tube of length 2l and radius 2r for same pressure difference would be
  • 16 V
  • 9 V
  • 8 V
  • 2 V
The working of venturimeter is based on
  • Torricceli’s law
  • Pascal’s law
  • Bernoulli’s theorem
  • Archimcde’s principle
  • Stokes’s law
An application of Bernoulli’s equation for fluid flow is found in
  • Dynamic lift of an aeroplane
  • Viscosity meter
  • Capillary rise
  • Hydraulic press
A tank of height H is fully filled with water. If the water rushing from a hole made in the tank below the free surface, strikes the floor at maximum horizontal distance, then the depth of the hole from the free surface must be
  • (3/4)H
  • (2/3)H
  • (1/4)H
  • (1/2)H
A rectangular vessel when full of water takes 10 min to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water?
  • 9 min
  • 7 min
  • 5 min
  • 3 min
Bernoulli\'s principle is based on the law of conservation of
  • Angular momentum
  • Linear momentum
  • Mass
  • Energy
When the temperature increases, the viscosity of
  • Gases decreases and liquid increases
  • Gases increases and liquids decreases
  • Gases and liquids increases
  • Gases and liquids decreases
Water is flowing in a pipe of diameter 4 cm with a velocity 3 m/s. The water then enters into a tube of diameter 2 cm. The velocity of water in the other pipe is
  • 3 m/s
  • 6 m/s
  • 12 m/s
  • 8 m/s
In stream line flow of liquid, the total energy of liquid is constant at
  • All points
  • Inner points
  • Outer points
  • None of these
Two solid spheres of same metal hut of mass M and 8M fall simultaneously on a viscous liquid and their terminal velocities are v and nv, then value of n is
  • 16
  • 8
  • 4
  • 2
Assertion A bubble comes from the bottom of a lake to the top
Reason Its radius increases.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Paper pins are made to have pointed end.
Reason Because pointed pins have very small area due to which even for small applied force it exert large pressure on the surface.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
A concrete sphere of radius R has a cavity of radius r which is packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3 for this sphere to float with its entire volume submerged under water. Ratio of mass of concrete to mass of sawdust will he
  • 8
  • 4
  • 3
  • zero
A tank 5 m high is half filled with water and then is filled to the top with oil of density 0.85 g/cm3. The pressure at the bottom of the tank, due to these liquids is
  • 1.85 dyne/cm2
  • 89.25 dyne/cm2
  • 462.5 dyne/cm2
  • 500 dyne/cm2
A wooden block of volume 1000 cm3 is suspended from a spring balance. It weighs 12 N in air. It is suspended in water such that, half of the block is below the surface of water. The reading of the spring balance is
  • 10 N
  • 9 N
  • 8 N
  • 7 N
Two different liquids are flowing in two tubes of equal radius. The ratio of coefficients of viscosity of liquids is 52 : 49 and the ratio of their densities is 13: 1, then the ratio of their critical velocities will be
  • 4 : 49
  • 49 : 4
  • 2 : 7
  • 7 : 2
A capillary tube is attached horizontally to a constant head arrangement. If the radius of the capillary tube is increased by 10%, then the rate of flow of liquid will change nearly by
  • + 10%
  • + 46%
  • – 10%
  • – 40%
A soap film of surface tension 3 × 10–2Nm–1 formed in rectangular frame, can support a straw. The length of the film is 10 cm. Mass of the straw the film can support is
  • 0.06 g
  • 0.6 g
  • 6 g
  • 60 g
If the work done in blowing a bubble of volume V is W, then the work done in blowing the bubble of volume 2V from the same soap solution will be
  • W/2
  • 2)
    Physics-Mechanical Properties of Fluids-78635.png

  • Physics-Mechanical Properties of Fluids-78636.png

  • Physics-Mechanical Properties of Fluids-78637.png
The spherical shape of rain-drop is due to
  • Density of the liquid
  • Surface tension
  • Atmospheric pressure
  • Gravity
When there is no external force, the shape of a liquid drop is determined by
  • Surface tension of the liquid
  • Density of liquid
  • Viscosity of liquid
  • Temperature of air only
A pin or a needle floats on the surface of water, the reason for this is
  • Surface tension
  • Less weight
  • Upthrust of liquid
  • None of these
Due to which property of water, tiny particles of camphor dance on the surface of water ?
  • Viscosity
  • Surface tension
  • Weight
  • Floating force
If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to 2D is
  • 2πD2T
  • 4πD2T
  • 6πD2T
  • 8πD2T
If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is
  • W/2
  • 2W
  • 4W

  • Physics-Mechanical Properties of Fluids-78640.png
A frame made of a metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50%, the energy of the soap film will be changed by
  • 100%
  • 75%
  • 50%
  • 25%
0:0:1


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