Mechanics of Materials Quiz

The SI unit of stress is:

• Pascal

• Newton

• Meter

• Kilogram

The ratio of lateral strain to longitudinal strain is called

• Young’s modulus

• Poisson’s ratio

• Bulk modulus

• Rigidity modulus

A rod of length 2 m is stretched by 1 mm. The strain produced is:

• 0.0005

• 0.001

• 0.005

• 0.05

Stress is defined as the force acting per unit

• Length

• Cross-sectional area

• Volume

• Weight

If a force of 2000 N acts on an area of 20 mm², the stress induced (in MPa) is

• 10

• 100

• 1

• 0.1

The elastic limit is the point beyond which

• Permanent deformation starts

• Material breaks

• Stress is zero

• Strain is zero

The modulus of rigidity is related to

• Volumetric strain

• Shear strain

• Longitudinal strain

• Lateral strain

Which of these forces causes elongation in a material?

• Shear force

• Compressional force

• Tensile force

• Bending force

Shear stress acts:

• Perpendicular to the surface

• Parallel to the surface

• Both perpendicular and parallel

• None of these

The ratio of stress to strain in the elastic range is

• Modulus of elasticity

• Poisson's ratio

• Modulus of rigidity

• Bulk modulus