Page 1 - HA CH 11 CLASS XI
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HOME ASSIGNMENTS (Elastic Properties of Solid)


                    1.     The modulus of elasticity is dimensionally equivalent to
                           (a)    Strain                    (b)      Stress
                           (c)    Surface tension      (d)      Poisson’s ratio


                    2.     If by applying a force, the shape of a body is changed, then the corresponding stress is known as
                           (a)    Tensile stress        (b)      Bulk stress
                           (c)    Shearing stress      (d)      Compressive stress

                    3.     According to Horke’s law of elasticity, within elastic limits, if the stress is increased, the ratio of
                           stress to strain
                           (a)    Increases              (b)      Decreases
                           (c)    Becomes zero        (d)      Remains constant

                    4.     Two wires have the same material and length, but their masses are in the ration of 4:3. If they are
                           stretched by the same force, their elongations will be in the ratio of
                           (a)    2:3                       (b)      3:4
                           (c)    4:3                       (d)      9:16

                    5.     The energy stored per init volume of a strained wire is

                           (a)


                           (b)


                           (c)
                           (d)    stress ´ strain

                    6.     A wire of length ‘L’ and cross-sectional area A is mad of a material of Young’s modulus Y. if the wire
                           is stretched by an amount x then work done is (MP PMT 87, 88)

                           (a)    F ´ x                     (b)


                           (c)                       (d)

                    7.     The following four wires of length L and the radius r are made of same material. Which of these will
                           have the largest extension when the same tension is applied. (CPMT 90)
                           (a)    L = 50 cm, r = 0.25 mm
                           (b)   L = 100 cm, r = 0.5 mm
                           (c)    L = 200 cm, r = 1 mm
                           (d)    L = 3000 cm, r = 1.5 mm

                    8.     In an experiment to determine the Young’s modulus of the material of a wire, the length of the wire
                           and the suspended mass are doubled. Then the Young’s modulus of the wire
                           (a)    Becomes double        (b)      Becomes four time
                           (c)    Remain unchanged    (d)      Becomes half
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