JEE Questions for Physics Mechanical Properties Of Fluids Quiz 8 - MCQExams.com

A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then what is the stress on B ?
  • Equal to that on A
  • Four times that on A
  • Two times that on A
  • Half that on A
If the length of wire is reduced to half then it can hold the .............load.
  • Half
  • Same
  • Double
  • One fourth
Steel and copper wires of same length are stretched by the same weight one after the other. Young's modulus of steel the ratio increase in length ?

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    Physics-Mechanical Properties of Fluids-78719.png

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An area of a cross-section of rubber string is 2 cm3. Its length is doubled when stretched with a linear force of 2 × 105 dynes. What will be young's modulus of the rubber in dynes?

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    Physics-Mechanical Properties of Fluids-78724.png

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A substance breaks down by a stress of If the density of the material of the wire is then the length of wire of the substance which will break under its own weight when suspended vertically is.............
  • 66.6 m
  • 60.0 m
  • 33.3 m
  • 30.0 m
The temperature of a wire of length 1 meter and area of cross-sectional section 1 cm2 is increased from to If the rod is not allowed to increase in length. What will be the force required ?
Physics-Mechanical Properties of Fluids-78729.png
  • 103 N
  • 104 N
  • 105 N
  • 109 N
If longitudinal strain for a wire is 0.03 and its Poisson's ratio is 0.5, then what is its lateral strain ?
  • 0.003
  • 0.0075
  • 0.015
  • 0.4
Two wires of copper having the length in the ratio 4 : 1 and their are as 1 : 4 are stretched by the same force. What will be the ratio of longitudinal strain in the two wires ?
  • 1 : 16
  • 16 : 1
  • 1 : 64
  • 64 : 1
200 kg weight hanged at a free edge of vertical wire of length 600.5 cm when removed the weight, length reduced by 0.5 cm and it gets original status then what is the young modulus of wire ?

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There is a hole in the bottom of tank having water. If total pressure at bottom 3 atm (1 atm ) then the velocity of water flowig drom hole is

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    Physics-Mechanical Properties of Fluids-78961.png

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  • None of these
The ratio of diameter of two wires of same material is n : 1 the length of wires are 4 m each. On applying the same load. What will be the increase in length of their wire ?
  • n2 times
  • n times
  • 2n times
  • None of the above

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  • 0.002
  • 0.001
  • 0.003
  • 0.01
A steel wire is stretched with a definite load of If the young's modulus of the wire is Y. For decreasing the value of Y............
  • Radius is to be decreased
  • Radius is to be increased
  • Length is to be increased
  • None of the above

Physics-Mechanical Properties of Fluids-78740.png
  • 1 : 2
  • 1 : 1
  • 2 : 1
  • 8 : 1

Physics-Mechanical Properties of Fluids-78742.png
  • 4.2 N
  • 4.4 N
  • 2.4 N
  • 8.8 N
A uniform plank of young's modulus Y is moved over a smooth horizontal surface by a constant horizontal force F, The area of cross-section of the plank is A. What is the compressive strain on its plank in the direction by the force ?

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    Physics-Mechanical Properties of Fluids-78745.png

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The length of a wire is 1.0 m and the area of cross-section is 1.0 × 10–2 cm2 If the work done for increase in length by 0.2 cm is 0.4 joule. Then what is the young's modulus ? Of material of the wire?

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    Physics-Mechanical Properties of Fluids-78750.png

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According to Hooke's law of elasticity stress is increased the ratio of stress to strain.........
  • increases
  • Decreases
  • becomes zero
  • Remains constant

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    Physics-Mechanical Properties of Fluids-78757.png

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A wire of length 2 m is made from 10 cm3 of copper. A force F is applied so that its length increases by 2 mm. Another wire of length 8 m is made from the same volume of copper. If the force F is applied to it, its length will increase by............
  • 3.2 cm
  • 0.8 cm
  • 1.6 cm
  • 2.4 cm
A wire of length L and radius r is rigidly fixed at one end on stretching the other end of the wire a force F the increase in its lengths is L. If another wire of same material but of length 2L and radius 2r is stretched with a force of 2F, the increase in its length will be ..........
  • l
  • 2l
  • l/2
  • l/4
Which of the following statement is correct
  • Hooke's law is applicable only within elastic limit
  • The adiabatic and isothermal elastic constants of a gas area equal
  • Young's modulus is dimensionsless
  • Stress multiplied by strain is equal to stored energy
Which one of the following quantities does not have unit of force per unit area..........
  • stress
  • strain
  • Young's modulus of elasticity
  • pressure
A fixed volume of iron is drawn into a wire of length L. The extension x produced in this wire be a constant force F is proportional to..........

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  • 2)
    Physics-Mechanical Properties of Fluids-78764.png
  • L2
  • L
A wire is stretched by 0.01 m by a certain force F. Another wire of same material whose diameter and length are double to the original wire is stretched by the same force ? Then what will be its elongation?
  • 0.005 m
  • 0.01 m
  • 0.02 m
  • 0.002 m
The Coefficient of linear expansion of brass & steel are α1 and α2 If we take a brass rod of length l1 and steel rod of length l2 at 0o C, their difference in length (l2 – l1) will remain the same at a temperature if.................

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    Physics-Mechanical Properties of Fluids-78768.png

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  • 1.75
  • 1.5
  • 2.5
  • 5.0
An iron rod of length 2 m and cross-section area of 50 mm2 stretched by 0.5 mm, when a mass of 250 kg is hung from its lower end. What is young's modulus of the iron rod ?

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    Physics-Mechanical Properties of Fluids-78775.png

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A load W produces an extension of 1 mm in a thread of radius r. Now if the load is made 4 w and radius is made 2r all other things remaining same the extension will becomes..............
  • 4 mm
  • 16 mm
  • 1 mm
  • 0.25 mm

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  • 0.5 mm
  • 0.25 mm
  • 0.05 mm
  • 5 mm
If the force constant of a wire is k. What is the work done in increasing the length of the wire by l?

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    Physics-Mechanical Properties of Fluids-78783.png

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Wire A and B are made from the same material. A has twice the diameter and three times the length of B. If the elastic limits are not reached when each is stretched by the same tension, what is the ratio of energy stored in A to that in B ?
  • 2 : 3
  • 3 : 4
  • 3 : 2
  • 6 : 1

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    Physics-Mechanical Properties of Fluids-78802.png

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If a spring extends by x cm loading then what is the energy stored by the spring ? (If T is tension in the spring & K is spring constant)

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    Physics-Mechanical Properties of Fluids-78807.png

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On stretching a wire what is the elastic energy stored per unit volume ?

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    Physics-Mechanical Properties of Fluids-78812.png

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  • 62. 50 J
  • 0.177 J
  • 0.075 J
  • 0.150 J

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  • 9 m
  • 18 m
  • 180 m
  • 90 m

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  • 108
  • 2 × 108
  • 109
  • 2 × 109

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  • 0.01
  • 0.06
  • 0.02
  • 0.03

Physics-Mechanical Properties of Fluids-78824.png
  • 10 × 1012
  • 1 × 1012
  • 100 × 1012
  • 20 × 1012
What is the isothermal bulk modulus of a gas at atmospheric pressure ?
  • 1 mm of Hg
  • 13.6 mm of Hg

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  • Physics-Mechanical Properties of Fluids-78827.png
A material has Poisson's ratio 0.50. If uniform rod of it suffers a longitudinal strain of 2 × 10–3. Then what is percentage change in volume ?
  • 0.6
  • 0.4
  • 0.2
  • 0
Which statement is true for a metal......
  • Y < η
  • Y = η
  • Y > η
  • Y < 1/η
Which of the following relation is true

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    Physics-Mechanical Properties of Fluids-78832.png

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The upper end of a wire of radius 4 mm and length 100 cm is clamped and its other end is twisted through an angle of 30o. Then what is the angle of shear ?
  • 12o
  • 0.12o
  • 1.2o
  • 0.012o
Mark the wrong statement.
  • Sliding of molecular layer is much easier than compression or expansion
  • Reciprocal of bulk modulus is called compressibility
  • Twist is difficult in big rod as compared to small rod.
  • Which is more strong out of hollow and solid cylinder having equal length and mass
A 2m long rod of radius 1 cm which is fixed from one end is gien a twist of 0.8 radians. What will be the shear strain developed ?
  • 0.002
  • 0.004
  • 0.008
  • 0.016
Shearing stress causes change in
  • length
  • breadth
  • shape
  • volume
0:0:1


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