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Mechanical Prop...

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  • Question 1
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    When a wire of length 10 m is subjected to a force of 100 N along its length, the lateral strain produced is 0.01× 10-3m. The Poisson\'s ratio was found to be 0.4. If the area of cross-section of wire is 0.025 m2 , its Young\'s modulus is

  • Question 2
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    A cube of side 40 mm has its upper face displaced by 0.1 mm by a tangential force of 8 kN. The shearing modulus of cube is

  • Question 3
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    Assertion (A) Ductile metals are used to prepare thin wires.
    Reason (R) In the stress – strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

  • Question 4
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    The pressure of a medium is changed from 1.01 × 105 Pa to 1.165 × 105 Pa and change in volume is 10% keeping temperature constant. The Bulk modulus of the medium is

  • Question 5
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    The radii and Young\'s modulii of two uniform wires A and B are in the ratio 2 : 1 and 1 : 2, respectively. Both wires are subjected to the same longitudinal force. If the increase in length of the wire A is one percent, the percentage increase in length of the wire B is

  • Question 6
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    The increase in length is l of a wire of length L by the longitudinal stress. Then the stress is proportional to

  • Question 7
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    Which is the most elastic ?

  • Question 8
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    The material which practically does not show elastic effect is

  • Question 9
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    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

  • Question 10
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    Why the spring is made up of steel in comparison of copper ?

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