Assertion: If length of a wire is halved, its Young's modulus of elasticity will become two times.

Reason: The ratio of longitudinal stress and longitudinal strain is called Young's modulus of elasticity.

Assertion: Stress and modulus of elasticity have the same dimensions.

Reason: Strain is dimensionless.

Assertion: If radius of cylindrical wire is doubled, then this wire can bear four times stress.

Reason: By doubling the radius, the area of cross-section will become four times.

Assertion: Bulk modulus of an incompressible fluid is infinite.

Reason: Density of incompressible fluid remains constant.

Assertion: If value of Young's modulus of elasticity of a material is less, then it means material is ductile.

Reason: If a material is easily stretchable, then its value of Young's modulus of elasticity should be less.

Assertion: Modulus of elasticity does depend upon the dimensions of material.

Reason: Modulus of elasticity is a material property.

Assertion: Up to the elastic limit, strain $\propto$ stress.

Reason: Up to the elastic limit material returns to its original shape and size, when the external force is removed.