ISRO Draughtsman-B Mechanical Question Paper - 2019 (Set -1) with Answer Key

Malleability is a property of a material enabling it to be drawn into thin sheets.
Ductility is a property of a material enabling it to be drawn into wires.

One degree is equal to Pi/180 Radians

Load per unit area is known as Stress.

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.