JEE Questions for Physics Mechanical Properties Of Fluids Quiz 7 - MCQExams.com

If the surface tension of a liquid is T, the gain in surface energy for an increase in liquid surface by A is
  • AT–1
  • AT
  • A2 T
  • A2T2
A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is
  • R/2
  • R/5
  • R/6
  • R/10
A liquid does not wet the sides of a solid, if the angle of contact is
  • Zero
  • Obtuse (More than 90°)
  • Acute (Less than 90°)
  • 90°
The meniscus of mercury in the capillary tube is
  • Convex
  • Concave
  • Plane
  • Uncertain
When the temperature is increased the angle of contact of a liquid
  • Increases
  • Decreases
  • Remains the same
  • First increases and then decreases
The angle of contact between glass and mercury is
  • 0°
  • 30°
  • 90°
  • 135°
The value of contact angle for kerosene with solid surface
  • 0°
  • 90°
  • 45°
  • 33°
Nature of meniscus for liquid of 0° angle of contact
  • Plane
  • Parabolic
  • Semi-spherical
  • Cylindrical
The excess of pressure inside a soap bubble than that of the outer pressure is

  • Physics-Mechanical Properties of Fluids-78645.png
  • 2)
    Physics-Mechanical Properties of Fluids-78646.png

  • Physics-Mechanical Properties of Fluids-78647.png

  • Physics-Mechanical Properties of Fluids-78648.png
The excess pressure in a soap bubble is thrice that in other one. Then the ratio of their volume is
  • 1 : 3
  • 1 : 9
  • 27 : 1
  • 1 : 27
A capillary tube of radius R is immersed in water and water rises in it to a height H. Mass of water in the capillary tube is M. If the radius of the tube is doubled, mass of water that will rise in the capillary tube will now be
  • M
  • 2M
  • M/2
  • 4M
If the diameter of a capillary tube is doubled, then the height of the liquid that will rise is
  • Twice
  • Half
  • Same as earlier
  • None of these
Two capillary tubes of radii 0.2 cm and 0.4 cm are dipped in the same liquid. The ratio of heights trough which liquid will rise in the tubes is
  • 1 : 2
  • 2 : 1
  • 1 : 4
  • 4 : 1
When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is 75 × 10–3 N/m, the radius of capillary is
  • 0.1 mm
  • 0.5 mm
  • 1 mm
  • 2 mm
Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be
  • 6h
  • 1/6 h
  • h
  • Zero
The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is 104. The height of the hill is
  • 250 m
  • 2.5 km
  • 1.25 km
  • 750 m
When a large bubble rises from the bottom of a lake to the surface. Its radius doubles. If atmospheric pressure is equal to that of column of water height H, then the depth of lake is
  • H
  • 2H
  • 7H
  • 8H
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
  • 5m
  • 10m
  • 15m
  • 20m
When water flows at a rate Q through a tube of radius r placed horizontally, a pressure difference p develops across the ends of the tube. If the radius of the tube is doubled and the rate of flow halved, the pressure difference will be
  • 8p
  • p
  • p/8
  • p/32
With rise in temperature, density of a given body changes according to one of the following relations
  • ρ = ρ0 [1 + γ∆θ]
  • ρ = ρ0 [1 – γ∆θ]
  • ρ = ρ0 γ∆θ
  • ρ = ρ0 / γ∆θ
By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of Hg (density = 13.6 gm/cm3). Using the straw, he can drink water from a glass up to a maximum depth of
  • 10 cm
  • 75 cm
  • 13.6 cm
  • 1.36 cm
An ice berg of density 900 kg/m3 is floating in water of density 1000 kg/m3. The percentage of volume of ice-cube outside the water is
  • 20%
  • 35%
  • 10%
  • 25%
A log of wood of mass 120 kg floats in water. The weight that can be put on the raft to make it just sink, should be (density of wood = 600 kg/m3)
  • 80 kg
  • 50 kg
  • 60 kg
  • 30 kg
A block of steel of size 5 cm × 5 cm × 5 cm is weighed in water. If the relative density of steel is 7, its apparent weight is
  • 6 × 5 × 5 × 5 gf
  • 4 × 4 × 4 × 7 gf
  • 5 × 5 × 5 × 7 gf
  • 5 × 5 × 5 × 6 gf
A block of wood weighs 4 N in air and 3 N when immersed in a liquid. The buoyant force in newton is
  • Zero
  • 1
  • 3/4
  • 4/3
Two pieces of metal when immersed in a liquid have equal upthrust on them; then
  • Both pieces must have equal weights
  • Both pieces must have equal densities
  • Both pieces must have equal volumes
  • Both are floating to the same depth
An ice block contains a glass ball when the ice melts within the water containing vessel, the level of water
  • Rises
  • Falls
  • Unchanged
  • First rises and then falls
A large ship can float but a steel needle sinks because of
  • Viscosity
  • Surface tension
  • Density
  • None of these
Construction of submarines is based on
  • Archimedes' principle
  • Bernoulli's theorem
  • Pascal's law
  • Newton's laws
A body of uniform cross-sectional area floats in a liquid of density thrice its value.The fraction of exposed height will be
  • 2/3
  • 5/6
  • 1/6
  • 1/3
Water is flowing through a tube of non-uniform cross-section. Ratio of the radius at entry and exit end of the pipe is 3 : 2. Then the ratio of velocities at entry and exit of liquid is
  • 4 : 9
  • 9 : 4
  • 8 : 27
  • 1 : 1
The working of venturimeter is based on
  • Torricelli's law
  • Pascal's law
  • Bernoulli's theorem
  • Archimedes' principle
  • Stoke's law
The working of an atomizer depends upon
  • Bermoulli's theorem
  • Boyle's law
  • Archimedes' principle
  • Newton's law of motion
Two rain drops falling through air have radii in the ratio 1 : 2. They will have terminal velocity in the ratio
  • 4 : 1
  • 1 : 4
  • 2 : 1
  • 1 : 2
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
  • water will begin to overflow through the capillary
  • angle of contact decreases
  • angle of contact increases
  • the meniscus completely vanishes
  • water will rise to a level less than 3 cm
A capillary tube (A) is dipped in water. Another identical tube (B) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

  • Physics-Mechanical Properties of Fluids-78669.png
  • 2)
    Physics-Mechanical Properties of Fluids-78670.png

  • Physics-Mechanical Properties of Fluids-78671.png

  • Physics-Mechanical Properties of Fluids-78672.png
Water rises in a capillary tube to a height h. Choose false statement regarding capillary rise from the following.
  • On the surface of the Jupiter, height will be less than h
  • In a lift moving up with constant acceleration height is less than h
  • On the surface of the moon the height is more than h
  • In a lift moving down with constant acceleration height is less than h
  • At the poles, height is less than that at equator
On heating water, bubbles beings formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If r < < R and the surface tension of water is T, value of r just before bubbles detach is (density of water is ρ )
Physics-Mechanical Properties of Fluids-78674.png

  • Physics-Mechanical Properties of Fluids-78675.png
  • 2)
    Physics-Mechanical Properties of Fluids-78676.png

  • Physics-Mechanical Properties of Fluids-78677.png

  • Physics-Mechanical Properties of Fluids-78678.png
A drop of some liquid of volume 0.04 cm3 is placed on the surface of a glass slide. Then, another glass slide is placed on it in such a way that the liquid forms a thin layer of area 20 cm2 between the surfaces of the two slides. To separate the slides a force of 16×105 dyne has to be applied normal to the surfaces. The surface tension of the liquid is (in dyne – cm-1).
  • 60
  • 70
  • 80
  • 90
A spherical solid ball of volume V is made of a material of density ρ1. It is falling through a liquid of density ρ2 (ρ2 < ρ1 ). [assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed v , i.e. Fviscous= –kv2 (k > 0)]. The terminal speed of the ball is

  • Physics-Mechanical Properties of Fluids-78680.png
  • 2)
    Physics-Mechanical Properties of Fluids-78681.png

  • Physics-Mechanical Properties of Fluids-78682.png

  • Physics-Mechanical Properties of Fluids-78683.png
There is a circular tube in a vertical plane. Two liquids which do not mix and of densities d1 and d2 are filled in the tube. Each liquid subtends 90° angle at centre. Radius joining their interface makes an angle α with vertical. Ratio d1 /d2 is
Physics-Mechanical Properties of Fluids-78685.png

  • Physics-Mechanical Properties of Fluids-78686.png
  • 2)
    Physics-Mechanical Properties of Fluids-78687.png

  • Physics-Mechanical Properties of Fluids-78688.png

  • Physics-Mechanical Properties of Fluids-78689.png
Two solid spheres A and B of equal volumes but of different densities dA and dB are connected by a string. They are fully immersed in a fluid of density dF They get arranged into an equilibrium state as shown in the figure with a tension in the string. The arrangement is possible only if
Physics-Mechanical Properties of Fluids-78690.png
  • dA < dF
  • dB > dF
  • dA + dB = 2dF
  • All of these

Physics-Mechanical Properties of Fluids-78692.png

  • Physics-Mechanical Properties of Fluids-78693.png
  • Y
  • 2Y
  • 4Y
A beam of metal supported at the two ends is loaded at the center. The depression at the center is proportional to..............
  • Y2
  • Y

  • Physics-Mechanical Properties of Fluids-78694.png

  • Physics-Mechanical Properties of Fluids-78695.png
On increasing the length by 0.5 mm in a steel wire of length 2 m and area of cross-section 2 mm2 the force required is................
Physics-Mechanical Properties of Fluids-78697.png

  • Physics-Mechanical Properties of Fluids-78698.png
  • 2)
    Physics-Mechanical Properties of Fluids-78699.png

  • Physics-Mechanical Properties of Fluids-78700.png

  • Physics-Mechanical Properties of Fluids-78701.png

Physics-Mechanical Properties of Fluids-78703.png
  • 3.18
  • 6.36
  • 5.18
  • 1.59
A force F is needed to break a copper wire having radius R, The force needed to break a copper wire of radius 2R will be........
  • F/2
  • F
  • 4F
  • F/4
A rubber cord 10m long is suspended vertically. How much does it stretch under its own weight.
Physics-Mechanical Properties of Fluids-78705.png

  • Physics-Mechanical Properties of Fluids-78706.png
  • 2)
    Physics-Mechanical Properties of Fluids-78707.png

  • Physics-Mechanical Properties of Fluids-78708.png

  • Physics-Mechanical Properties of Fluids-78709.png
The young's modulus of the material of a wire is equal to the ...........
  • stress required to increase its length four times
  • strtess required to prdouce unit strain
  • strain produced in it
  • stress acting on it
If x, longitudinal strain is produced in a wire of young's modulus y then energy stored in the material of the wire per unit volume is..........

  • Physics-Mechanical Properties of Fluids-78712.png
  • 2)
    Physics-Mechanical Properties of Fluids-78713.png

  • Physics-Mechanical Properties of Fluids-78714.png

  • Physics-Mechanical Properties of Fluids-78715.png
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers