JEE Questions for Physics Mechanical Properties Of Fluids Quiz 5 - MCQExams.com

Melting point of ice.....
  • Increases with increasing pressure
  • Decreases with increasing pressure
  • Is independent of pressure
  • is proportional of pressure
Amount of heat required to raise the temprature of a body through 1k is called it is
  • Water equivalent
  • Thermal capacity
  • Entropy
  • Specific heat
10 g of ice at 0oC is mixed with 100 g of water at 50o C what is the resultant temperature of mixture.
  • 31.2o C
  • 32.8o C
  • 36.7o C
  • 38.2o C
Two metal strips that constituate a thermostant must necessarily in their
  • Mass
  • Length
  • Resistivity
  • Coefficient of liner expansion
A lead bullet at 27o C just melts when stopped by an obstacle Assuming that 25% of heat is absorbed by the obstacle then the velocity of the bullet at the time of striking.[M.P. of lead = 327o C, specific heat of lead = 0.03 cal/x latent heat of fusion of lead = 6 cal/g and J = 4.2 Jute / cal]
  • 410 m/s
  • 1230 m/s
  • 307.5 m/s
  • None of these
An electric kettle takes 4 A current at 220 V How much time will it take to boil 1 kg of water from temperature 20 C ? The temperature of boiling water is 100C.
  • 12.6 min
  • 4.2 min
  • 6.3 min
  • 8.4 min
Assertion : Specific heat capacity is the cause of formation of land and sea breeze.
Reason : The specific heat of water is more then land.
(a) If both asseration and reason are true and the reason is the correct explanation of the reason.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.
  • a
  • b
  • c
  • d
The value of surface tension of a liquid at critical temperature is
  • zero
  • Infinite
  • Between 0 and ∞
  • Cannot be determined
Writing on black board with a piece of chalk is possible by the property of
  • Adhesive force
  • Cohesive force
  • Surface tension
  • Viscosity
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
A beaker of radius 15 cm is filled with a liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface of the liquid is
  • 0.075 N
  • 1.5 × 10-2 N
  • 0.225 N
  • 2.25 × 10-2 N
If temperature increases, the surface tension of a liquid
  • Increases
  • Decreases
  • Remains the same
  • Increases then decreases
Oil spreads over the surface of water whereas water does not spread over the surface of the oil, due to
  • Surface tension of water is very high
  • Surface tension of water is very low
  • Viscosity of oil is high
  • Viscosity of water is high
Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is
  • 30 dynes
  • 60 dynes
  • 750 dynes
  • 750 π dynes
The surface tension of a liquid
  • Increases with area
  • Decreases with area
  • Increases with temperature
  • Decreases with temperature
Due to which property of water, tiny particles of camphor dance on the surface of water ?
  • Viscosity
  • Surface tension
  • Weight
  • Floating force
Consider a liquid contained in a vessel. The liquid solid adhesive force is very weak as compared to the cohesive force in the liquid. The shape of the liquid surface near the solid shall be
  • Horizontal
  • Almost vertical
  • Concave
  • Convex
When a drop of water is dropped on oil surface, then
  • It will mix up with oil
  • It spreads in the form of a film
  • It will deform
  • It remains spherical
Two pieces of glass plate one upon the other with a little water in between them cannot be separated easily because of
  • Inertia
  • Pressure
  • Surface tension
  • Viscosity
The potential energy of a molecule on the surface of liquid compared to one inside the liquid is
  • zero
  • Smaller
  • The same
  • Greater
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 two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be
  • r
  • 0
  • Infinity
  • 1/2 r
What is ratio of surface energy of 1 small drop and 1 large drop, if 1000 small drops combined to form 1 large drop?
  • 100 : 1
  • 1000 : 1
  • 10 : 1
  • 1 : 100
The amount of work done in forming a soap film of size 10 cm × 10 cm is (Surface tension T = 3 × 10–2 N/m )
  • 6 × 10–4 J
  • 3 × 10–4 J
  • 6 × 10–3 J
  • 3 × 10–2 J
A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is σ, then change in surface energy is
  • πD2σ
  • 2πD2σ
  • 3πD2σ
  • 4πD2σ
One thousand small water drops of equal radius combine to form a big drop. The ratio of final surface energy to the total initial surface energy is
  • 1000 : 1
  • 1 : 1000
  • 10 : 1
  • 1 : 10
If the radius of a spherical liquid (of surface tension S) drop increases from r to r + ∆r, the corresponding increase in the surface energy is
  • 8πr∆rs
  • 4πr∆rs
  • 16πr∆rs
  • 2πr∆rs
8 mercury drops coalesce to form one mercury drop, the energy changes by a factor of
  • 1
  • 2
  • 4
  • 6
Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly. (Surface tension of soap solution = 0.03 Nm–1)
  • 4π mJ
  • 0.2π mJ
  • 2π mJ
  • 0.4π mJ
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
  • 0o
  • 30o
  • 90o
  • 135o
Angle of contact of a liquid with a solid depends on
  • Solid only
  • Liquid only
  • Both solid and liquid only
  • Orientation of the solid surface in liquid
If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is
  • Acute angle
  • Obtuse angle
  • 90o
  • 0o
For which of the two pairs, the angle of contact is same?
  • Water and glass; glass and mercury
  • Pure water and glass; glass and alcohol
  • Silver and water; mercury and glass
  • Silver and chromium; water and chromium
A glass plate is partly dipped vertically in the mercury and the angle of contact is measured. If the plate is inclined, then the angle of contact will
  • Increase
  • Remain unchanged
  • Increase or decrease
  • Decrease
The liquid meniscus in capillary tube will be convex, if the angle of contact is
  • Greater than 90o
  • Less than 90o
  • Equal to 90o
  • Equal to 0o
Nature of meniscus for liquid of 0o angle of contact is
  • Plane
  • Parabolic
  • Semi-spherical
  • Cylindrical
A liquid wets a solid completely. The meniscus of the liquid in a sufficently long tube is
  • Flat
  • Concave
  • Convex
  • Cylindrical
The excess pressure inside a spherical drop of water is four times that of another drop. Then their respective mass ratio is
  • 1 : 16
  • 8 : 1
  • 1 : 4
  • 1 : 64
A long cylindrical glass vessel has a small hole of radius r at its bottom. The depth to which the vessel can be lowered vertically in the deep water bath (surface tension T) without any water entering inside is
  • 4T/ρrg
  • 3T/ρrg
  • 2T/ρrg
  • T/ρrg
Pressure inside two soap bubbles are 1.01 and 1.02 atmospheres. Ratio between their volume is
  • 102 : 101
  • (102)3 : (101)3
  • 8 : 1
  • 2 : 1
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
Excess pressure of one soap bubble is four times more than the other. Then , the ratio of volume of first bubble to another one is
  • 1 : 64
  • 1 : 4
  • 64 : 1
  • 1 : 2
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
Due to capillary action, a liquid will rise in a tube, if the angle of contact is
  • Acute
  • Obtuse
  • 90o
  • Zero
Water rises in plant fibres due to
  • Capillarity
  • Viscosity
  • Fluid pressure
  • Osmosis
In a capillary tube, water rises to 3mm.The height of water that will rise in another capillary tube having one-third radius of the first is
  • 1 mm
  • 3 mm
  • 6 mm
  • 9 mm
If the surface tension of water is 0.06 Nm–1 , then the capillary rise in a tube of diameter 1 mm (θ = 0o) is
  • 1.22 cm
  • 2.44 cm
  • 3.12 cm
  • 3.86 cm
Two capillary tubes of radii 0.2 cm and 0.4 cm are dipped in the same liquid . The ratio of heights through which liquid will rise in the tubes is
  • 1 : 2
  • 2 : 1
  • 1 : 4
  • 4 : 1
0:0:1


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