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question_answer1) 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.
question_answer2) 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.
question_answer3) Assertion : Steel is more elastic than rubber. Reason : Under given deforming force, steel is deformed less than rubber.
question_answer4) Assertion : Glassy solids have sharp melting point. Reason : The bonds between the atoms of glassy solids get broken at the same temperature.
question_answer5) 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.
question_answer6) Assertion : Bulk modulus of elasticity (K) represents incompressibility of the material. Reason : Bulk modulus of elasticity is proportional to change in pressure.
question_answer7) Assertion : Strain is a unitless quantity. Reason : Strain is equivalent to force.
question_answer8) Assertion : The bridges declared unsafe after a long use. Reason : Elastic strength of bridges losses with time.
question_answer9) 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.
question_answer10) Assertion : Young?s modulus for a perfectly plastic body is zero. Reason : For a perfectly plastic body, restoring force is zero.
question_answer11) 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.
question_answer12) Assertion : Sterss is the internal force per unit area of a body. Reason : Rubber is less elastic than steel.
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