CHAPTER 8

The units for stress and strain are

• A
• B
• C
• D

Which part of the stress - strain graph for metal obeys Hooke’s law.

• AB
• DE
• OA
• OB

Which of the following statements is FALSE about Young’s Modulus?

• It does not depend to the length of the wire.
• It depends on the material of the wire
• It is the ratio of the tensile stress to the tensile strain if the proportionality limit has not been exceeded.
• It is a property of a material that enables them to return to their original shape and size when the applied force is removed.

The uniform rod has cross-section A and length L is deformed by ΔL, when pulled by a normal force F, The Young Modulus of the material is.

• 
• 
• 
• 

The area under the graph stress-strain of a copper wire represents the

• Young’s modulus.
• Strain energy per unit volume.
• Spring constant.
• Energy stored

Brittle object it tends to

• break without deforming
• change its size and shape before breaking
• resist any change in shape and size
• regain fully its original shape and dimension

Heat conduction is a flow of energy in the form of heat

• from low temperature to high temperature through a solid.
• from high temperature to low temperature through a solid.
• form of heat irrespective of temperature through a solid.
• from high temperature to low temperature through a liquid.

What is the correct unit of the rate of heat transfer?

• Watt
• Pascal
• Joule
• Newton

The coefficient of area expansion is

• half the coefficient of volume expansion.
• three halves the coefficient of volume expansion.
• double the coefficient of linear expansion.
• triple the coefficient of linear expansion.

Coefficient of linear expansion, coefficient of area expansion and coefficient of volume expansion have the same unit of

• A
• B
• C
• D