NEETprep Bank NEET Physics Mechanical Properties of Solids Questions Solved

[Only for Dropper and XII batch]

The Young's modulus of a wire of length L and radius r is $Y N/m^2.$ 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

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

 The area of cross-section of a wire of length 1.1 metre is 1$m{m}^2.$It is loaded with 1 kg. If Young's modulus of copper is $1.1\times {10}^{11}N/m^2,$ then the increase in length will be (If $g=10m/s^2$)

(a) 0.01 mm                (b) 0.075 mm

(c) 0.1 mm                  (d) 0.15 mm