NEETprep Bank NEET Physics Mechanical Properties of Solids Questions Solved


[Only for Dropper and XII batch]

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The Young's modulus of a wire of length L and radius r is Y N/m2. If the length and radius are reduced to L/2 and r/2, then its Young's modulus will be -

(a) 1:1                           (b) 1:4

(c) 1:8                             (d) 8:1

(b) Young's modulus of wire does not varies with dimension of wire. It is the property of given material.

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When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be -

(a) 0.5 cm                              (b) 2 cm

(c) 4 cm                                 (d) 8 cm

(c)

      l=FLAY11r2(F,L and Y are constant)l2l1=r1r22=22=4l2=4l1=4cm

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 The area of cross-section of a wire of length 1.1 metre is 1mm2.It is loaded with 1 kg. If Young's modulus of copper is 1.1×1011N/m2, then the increase in length will be (If g=10m/s2)

(a) 0.01 mm                (b) 0.075 mm

(c) 0.1 mm                  (d) 0.15 mm

(c) l=mgLAY=1×10×1.11.1×1011×10-6m=0.1mm

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