3) The unit of strain is

Answer is:

no unit

Explanation:

Strain is the deformation of a material from stress. Strain is simply a ratio of the change in length to the original length. Deformations that are applied perpendicular to the cross section are normal strains, while deformations applied parallel to the cross section are shear strains.
There is no unit for strain.

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4) when a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is

Answer is:

compressive stress, compressive strain

Explanation:

Compressive Stress:-When a body is subjected to two equal and opposite axial pushes P ( also called compressive load), then the stress induced at any section of the body is known as compressive stress.

Compressive Strain:- When a body is subjected to two equal and opposite axial pushes P ( also called compressive load), there will be an increase in cross-sectional area and a decrease in length of the body. The ratio of the decrease in length to the original length is known as compressive strain.

when a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is

5) When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is

Answer is:

shear stress, shear strain

Explanation:

When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is shear stress and shear strain.