Quiz on Material Mechanics

Which of the following is not a type of force?

• Tensile

• Compressive

• Shear

• Rotational

Stress is defined as:

• Load × Area

• Load / Area

• Area / Load

• Load² / Area

Strain is a:

• Dimensionless quantity

• Quantity with unit Pascal

• Quantity with unit N/m

• Scalar with unit N

Which material has the highest ductility?

• Cast Iron

• Mild Steel

• Concrete

• Glass

The point on the stress-strain curve beyond which material permanently deforms is called:

• Ultimate point

• Elastic limit

• Breaking point

• Yield point

The stress at which a material breaks is called:

• Ultimate stress

• Yield stress

• Proof stress

• Tensile stress

The significance of factor of safety is:

• To reduce cost

• To ensure failure

• To provide extra margin of safety

• To minimize weight

Which of the following is not an elastic constant?

• Young's modulus

• Bulk modulus

• Poisson's ratio

• Thermal conductivity

Poisson's ratio is the ratio of:

• Longitudinal strain / lateral strain

• Lateral strain / longitudinal strain

• Shear stress / shear strain

• Bulk stress / volume strain

If a bar is made of two different materials joined in series, the total deformation is:

• Average of both

• Equal for both

• Sum of individual deformations

• Difference of individual deformations