Q.

Regarding elasticity which of the following statements are correct?

a) the point where the elasticity ends  and plasticity starts is called yield

     point

b) breaking stress depends on the area of cross section

c) the value of poisions ratio can not be greater than 0.5

d) air is more elastic than water

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a

a, b are correct

b

a, c are correct

c

b, d are correct           

d

a and d are correct

answer is B.

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Detailed Solution

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Poisson's ratio lies between -1 and 5

Water is more elastic than the air because a higher modulus indicates that the material is harder to deform.

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Regarding elasticity which of the following statements are correct? a) the point where the elasticity ends  and plasticity starts is called yield      point b) breaking stress depends on the area of cross section c) the value of poisions ratio can not be greater than 0.5 d) air is more elastic than water