Mechanical Prop...

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: The stretching of a coil is determined by its shear modulus.

Reason: Shear modulus change only shape of a body keeping its dimensions unchanged.

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Assertion : Steel is more elastic than rubber.

Reason : Under given deforming force, steel is deformed less than rubber.

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Assertion : A hollow shaft is found to be stronger than a solid shaft made of same material.

Reason : The torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder of same size and material.

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Assertion : Strain is a unitless quantity.

Reason : Strain is equivalent to force.

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Assertion : Two identical solid balls, one of ivory and the other of wet-clay are dropped from the same height on the floor. Both the balls will rise to same height after bouncing.

Reason : Ivory and wet-clay have same elasticity.

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Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring.

Reason : Steel is more elastic than copper.

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Assertion : Spring balances show correct readings even after they had been used for a long time interval.

Reason : On using for long time, spring balances losses its elastic strength.

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Assertion : Glassy solids have sharp melting point.

Reason : The bonds between the atoms of glassy solids get broken at the same temperature.

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Assertion : Bulk modulus of elasticity (K) represents incompressibility of the material.

Reason : Bulk modulus of elasticity is proportional to change in pressure.

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Assertion : The bridges declared unsafe after a long use.

Reason : Elastic strength of bridges losses with time.

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Assertion : Young's modulus for a perfectly plastic body is zero.

Reason : For a perfectly plastic body, restoring force is zero.

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Assertion : Stress is the internal force per unit area of a body.

Reason : Rubber is less elastic than steel.