Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following statements are correct? (1) Young's modulus, bulk modulus and shear modulus have the units of pressure (2) Young's modulus describes the length elasticity of a material (3) The value of Young's modulus depends on the dimensions of the body (4) Modulus of elasticity is the smallest value of stress required to produce a permanent distortion in a bodyA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
\[Y=\frac{longitudinal\text{ }stress}{longitudinal\text{ }strain}\] \[B=\frac{normal\text{ }stress}{volume\text{ }strain}\] \[\eta =\frac{shearing\text{ }stress}{shearing\text{ }strain}\] As strain is dimensionless, hence V, B and\[\eta \] possess the units of pressure. Y depends on the material of the body only. It is related with length elasticity of material.
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