JEE Questions for Physics Mechanical Properties Of Fluids Quiz 9 - MCQExams.com

What is the relationship between Young's modulus Y, Bulk modulus k and modulus of rigidity η?

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The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the passing through the origin is that the......
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  • Spring did not obey Hooke's law
  • Amplitude of the oscillations was large
  • Clock used needed regulating
  • Mass of the pan was neglected
A graph is shown between stress and strain for metals. The part in which Hooke's law holds good is
Physics-Mechanical Properties of Fluids-78850.png
  • OA
  • AB
  • BC
  • CD
The strain–stress curves of three wires of different materials are shown in the figure. P, Q and R the elastic limits of the wires the figure shows that
Physics-Mechanical Properties of Fluids-78852.png
  • Elasticity of wire P is maximum
  • Elasticity of wire Q is maximum
  • Tensile strength of R is maximum
  • none of above
The diagram shows a force extension graph for a Rubber band consider the following statements.
(I). It will be easier to compress these rubber than expand it
(II). Rubber does not return to its original length after it is stretched
(III). The rubber band will get heated if it is stretched and released
Which of these can be deduced from the graph.
Physics-Mechanical Properties of Fluids-78853.png
  • III only
  • II and III
  • I and III
  • I only
The stress versus strain graph for wires of two material A & B are as shown in the figure. If YA and YB are the young\'s modulus of the materials then
Physics-Mechanical Properties of Fluids-78855.png
  • YB = 2YA
  • YA = YB
  • YB = 3YA
  • YA = 3YB
The adjacent graph shows the extension of a wire of length 1m suspended from the top of a roof at one end with the load W connected to the other end. If the cross sectional area of the wire is 10–6 m2 , calculate the young's modulus of the material of the wire.
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    Physics-Mechanical Properties of Fluids-78858.png

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The graph shows the behavior of a length of wire in the region for which the substance obey's Hooke's law. P & Q represent.
Physics-Mechanical Properties of Fluids-78861.png
  • p = applied force, Q = extension
  • p = extension, Q = applied force
  • p = extension, Q = stored elastic energy
  • p = stored elastic energy, Q = extension
The potential energy U between two molecules as a function of the distance x between them has been shown in the figure. The two molecules are.
Physics-Mechanical Properties of Fluids-78863.png
  • Attracted when x lies between A & B and are repelled when x lies between B & C
  • Attracted when x lies between B and C and are repelled when x lies between A and B
  • Attracted when they reach B
  • Repelled when they reach B
The diagram shows stress v/s strain curve for the materials A and B. From the curves we infer that
Physics-Mechanical Properties of Fluids-78865.png
  • A is brittle but B is ductile
  • A is ductile and B is brittle
  • Both A & B are ductile
  • Both A & B are brittle
Which are of the following is the young's modulus (in N/m2) for the wire having the stress strain curve in the figure.
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The diagram shows the change x in the length of a thin uniform wire caused by the application of stress F at two different temperature T1 & T2. The variation
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  • T1 > T2
  • T1 < T2
  • T1 = T2
  • None of these
The point of maximum and minimum attraction in the curve between potential energy (U) and distance (r) of a diatomic molecules are respectively.
Physics-Mechanical Properties of Fluids-78874.png
  • S and R
  • T and S
  • R and S
  • S and T
Assertion : The bridges are declared unsafe after a long use.
Reason : Elastic strength of bridges decrease with
  • If both assertion and reason are true and 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 assertion and reason both are false
Assertion : Young's modulus for a perfectly plastic body is zero.
Reason : For a perfectly plastic body is zero.
  • If both assertion and reason are true and 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 assertion and reason both are false
Assertion : Identical spring of steel and copper are equally stretched more will be done on the steel spring.
Reason : Steel is more elastic than copper.
  • If both assertion and reason are true and 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 assertion and reason both are false
Which is the dimensional formula for modulus of rigidity ?

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When more than 20 kg mass is tied to the end of wire it breaks what is maximum mass that can be tied to the end of a wire of same material with half the radius ?
  • 20 kg
  • 5 kg
  • 80 kg
  • 160 kg
A beaker of radius 15 cm is filled with liquid of surface tension 0.075 N/m. Force across an imaginary diameter on the surface ofliquid is
  • 0.075 N
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    Physics-Mechanical Properties of Fluids-78882.png
  • 0.225 N

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  • 28 N
  • 14 N
  • 50 N
  • 38 N
A thin liquid film formed between a u-shaped wire and a light slider supports a weight of 1.5 × 10–2 N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is.
Physics-Mechanical Properties of Fluids-78886.png
  • 0.0125 Nm–1
  • 0.1 Nm–1
  • 0.05 Nm–1
  • 0.025 Nm–1
Radius of a soap bubble is 'r', surface tension of soap solution is T. Then without increasing the temperature how much energy will be needed to double its radius.
  • 4πr2T
  • 2πr2T
  • 12πr2T
  • 24πr2T
Two small drops mercury, each of radius R, coalesce the form a single large drop. The ratio of the total surface energies before and after the change is.

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The work done increasing the size of a soap film drom 10cm × 11cm or 3 × 10–4 Joule. The surface tension of the film is

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The relation between surface tension T. Surface area A and surface energy E is given by.

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The radill of two soap bubbles are r1 and r2. In isothermal conditions two meet together is vacum Then the radius of the resultant bubble is given by

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A spherical drop of coater has radius 1 mm if surface tension of contex is 70 × 10–3 N/m difference of pressures between inside and outside of the spherical drop is

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  • zero
Two bubbles A and B (A > B) are joined through a narrow tube than
  • The size of a will increase
  • The size of B will increase
  • The size of B will increase untill then pressure equals
  • None of these
A capillary tube at 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
  • 3M
  • 4M
In a capillary tube water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first is
  • 1.2 mm
  • 2.4 mm
  • 0.6 mm
  • 0.4 mm
A large number of water drops each of rdius r combine to have a drop of radius R. If the surface tension is T and the mechanical equilvalent at heat is J then the rise in tempreature will be

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A soap bubble is blown with the help of a mechanical pump at the mouth-of a tube the pump produces a certion increase per minit in the volume of the bubble irrespective of its internal pressure the graph between the pressure inside the soap bubble and time t will be

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Which graph present the variation of surface tension with temperature over small temperature ranges for coater.

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    Physics-Mechanical Properties of Fluids-78931.png

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When liquid medicine of testing S is to be put in the eye. It is done with the help of a dropper as the bulb on the top of the dropper is pressed a drop forms at the opening of the dropper we wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because the requires a minimum increase in its surface energy. To determine the size we calculate the net vertical force due to surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop the drop gets detached from the dropper.
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When liquid medicine of testing S is to be put in the eye. It is done with the help of a dropper as the bulb on the top of the dropper is pressed a drop forms at the opening of the dropper we wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because the requires a minimum increase in its surface energy. To determine the size we calculate the net vertical force due to surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop the drop gets detached from the dropper.
After the drop detaches its surface energy is

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Assertion : The concept of surface tension is help only for liquids.
Reason : Surface tension does not hold for gases.
  • 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
Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter.
Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.
  • 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
When a large bubble rises drom the bottom of a lake to the surface. Its radius double S. It atmospheric pressure in euqal to that of colurnn of colurnn of water height H then the depth of Lake is
  • H
  • 2H
  • 7H
  • 8H

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  • 10 cm
  • 75 cm
  • 13.6 cm
  • 1.36 cm
A spherical solid ball of volume V is made of a material of density S. It is falling through a liquid of density S2 (S2 < S1). Assume that the liquid opplies a viscous force on the ball that is proportional to square of its speed V. i.e. Fviscous = – KV2 (K >The terminal speed of the ball is

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If there were no gravity which of the following will not be there for a fluid.
  • Viscosity
  • Surface tension
  • pressure
  • Archime des's upward thrust
An engine pumps water continuously through a hose water leaves the hose with a velocity V and m is the mass per unit length of the water Jet what is the rate at which kinetic energy is imparted to water.

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Eight drops of a liquid of density 3 and each of radius a are fallingt through air with a constant velocity 3.75 cm S1 when the eight drops coalesce to form a single drop the terminal velocity of the new drop will be

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A cylinder of height 2.0 m is completely filled with water. The velocity of efflux of water cim m/s through a small hole on the side will of the cylinder mear its bottom is
  • 10
  • 20
  • 25.5
  • 5
Two drops of the same radius are falling through air with a steady velocity for 5 cm per sec. If the two drops coakesce the terminal velocity would be
  • 10 cm per sec
  • 2.5 cm per sec

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An application of Bernouli's equation for liquid flow is found in
  • Dynamic lift of an aeroplane
  • Viscocity metere
  • Capillary rise
  • tly dulic press
An L-Sp aped tube with a small office is held in a water stream as shown in fig. The upper end of the tube is 10.6 cm above the surface of water. What will be the height of the set of water coming from the office velocity of water stream is 2.45 m/s.
Physics-Mechanical Properties of Fluids-78966.png
  • zero
  • 30.0 cm
  • 10.6 cm
  • 40 cm
A tank is filled with water up to a height H. Water is allowed to come out of a hole P in one of the walls at a depth D below the surface of water express the horizontal distance x in terms of H and D.
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