Quiz on Mechanics and Materials

What is load in mechanics?

• Resistance offered by a material

• External force applied to a body

• Internal deformation

• Stress per unit strain

Stress is defined as:

• Change in length per unit length

• Load per unit mass

• Load per unit area

• Deformation per unit load

The SI unit of stress is:

• Newton (N)

• Pascal (Pa)

• Meter per second (m/s)

• Kilogram (kg)

Strain is defined as:

• Stress per unit area

• Load per unit volume

• Deformation per unit length

• Force per unit strain

Which of the following is dimensionless?

• Stress

• Load

• Strain

• Force

Stress developed in a body is due to:

• Gravity

• Weight

• Applied external force

• Density

The relationship between stress ( f ), force ( P ), and area ( A ) is:

• f = A/P

• f = P/A

• f = P × A

• f = P² / A

Which of the following correctly pairs units?

• Stress - Newton

• Strain - Meter

• Stress - N/m²

• Strain - N/m²

A tensile force tends to:

• Compress a body

• Stretch a body

• Bend a body

• Twist a body

Which of the following forces decreases the length of a body?

• Tensile force

• Compressive force

• Shear force

• Torsional force