JEE Questions for Physics Mechanical Properties Of Solids Quiz 3 - MCQExams.com

Why the spring is made up of steel in comparison of copper ?
  • Copper is more costly than steel
  • Copper is more elastic than steel
  • Steel is more elastic than copper
  • None of the above
After effects of elasticity are maximum for
  • Glass
  • Quartz
  • Rubber
  • Metal
A wire of cross section 4 mm2 is stretched by 0.1 mm by a certain weight. How far (length) will be wire of same material and length but of area 8 mm2 stretch under the action of same force?
  • 0.05 mm
  • 0.10 mm
  • 0.15 mm
  • 0.20 mm
Which one of the following substances possesses the highest elasticity?
  • Rubber
  • Glass
  • Steel
  • Copper
To Keep constant time, watches are fitted with balance wheel made of
  • Invar
  • Strainless steel
  • Tungsten
  • Platinum
How much force is required to produce an increase of 0.2% in the length of a brass wire of diameter 0.6 mm (Young\'s modulus for brass = 0.9 × 1011 N/m2)
  • Nearly 17 N
  • Nearly 34 N
  • Nearly 51 N
  • Nearly 68 N
Which of the following affects the elasticity of a substance ?
  • Hammering and annealing
  • Change in temperature
  • Impurity in substance
  • All of the above
In solids, inter-atomic forces are
  • Totally repulsive
  • Totally attractive
  • Combination of (a) and (b)
  • None of the above
The modulus of elasticity is dimensionally equivalent to
  • Surface tension
  • Stress
  • Strain
  • None of these
Under elastic limit the stress is
  • Inversely proportional to strain
  • Directly proportional to strain
  • Square root of strain
  • Independent of strain
Two wires of the same material and same length but diameters in the ratio 1 : 2 are stretched by the same force. The potential energy per unit volume of the two wires will be in the ratio
  • 1 : 2
  • 4 : 1
  • 2 : 1
  • 1 : 1
  • 16 : 1
Calculate the work done, if a wire is loaded by Mg weight and the increases in length is l
  • Mgl
  • Zero
  • Mgl/2
  • 2 Mgl
Two wires of same diameter of the same material having the length l and 2l. If the force F is applied on each, the ratio of the work done in the two wires will be
  • 1 : 2
  • 1 : 4
  • 2 : 1
  • 1 : 1
A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is
  • Zero
  • 0.05 Joule
  • 100 Joule
  • 500 Joule
If the forces constant of a wire is K, the work done in increasing the length of the wire by l is
  • Kl/2
  • Kl
  • Kl2/2
  • Kl2
A stretched rubber has
  • Increased kinetic energy
  • Increased potential energy
  • Decreased kinetic energy
  • Decreased potential energy
On stretching a wire, the elastic energy stored per unit volume is
  • Fl/2AL
  • FA/2L
  • FL/2A
  • Fl/2
The isothermal elasticity of a gas a equal to
  • Density
  • Volume
  • Pressure
  • Specific heat
The ratio of the adiabatic to isothermal elasticities of a triatomic gas is
  • 3/4
  • 4/3
  • 1
  • 5/3
Bulk modulus was first defined by
  • Young
  • Bulk
  • Maxwell
  • None of these
A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is
  • 0.01
  • 0.06
  • 0.02
  • 0.03
Which statement is true for a metal ?
  • Y < η
  • Y = η
  • Y > η
  • Y < 1/η
The Poisson\'s ratio cannot have the value
  • 0.7
  • 0.2
  • 0.1
  • 0.5
The reason for the change in shape of a regular body is
  • Volume stress
  • Shearing strain
  • Longitudinal strain
  • Metallic strain
Which is a correct relation ?
  • Y < σ
  • Y > σ
  • Y = σ
  • σ = + 1
The possible value of Poisson\'s ratio is
  • 1
  • 0.9
  • 0.8
  • 0.4
For most materials the Young\'s modulus is n times the rigidity modulus, where n is
  • 2
  • 3
  • 4
  • 5
  • 6
In the above graph, point B indicates
  • Breaking point
  • Limiting point
  • Yield point
  • None of these
In the above graph, point D indicates
  • Limiting point
  • Yield point
  • Breaking point
  • None of these
One end of a horizontal thick copper wire of length 2L and radius 2R is welded to an end of another horizontal thin copper wire of length L and radius R. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is
  • 0.25
  • 0.50
  • 2.00
  • 4.00
0:0:1


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