S.O.M Assessment-1 Group A

When a material undergoes stress without changing its volume, what is the value of Poisson's ratio?

• 0

• 0.25

• 0.5

• 0.33

If a copper cube, with all faces, are free to deform, has Young Modulus, Poisson ratio and coefficient of thermal expansion are E, v and α respectively. The cube is subjected to a uniform increase in temperature ∆T. The stress developed will be?

What is the term used to describe the region in the stress-strain curve where the material returns to its original shape after the stress is removed?

• Strain hardening region
  

• Necking region

• Elastic range

• Plastic deformation region

At what point on the stress strain curve does the material start to deform permanently?

• Upper yield point

• Lower yield point

• Elastic limit

• Ultimate point

What is the purpose of a factor of safety greater than one?

• It indicates that the structure will fail under load

• It signifies that the structure will only support the actual load

• It shows that the structure will support more than the actual load

• There is no correlation between factor safety and load application

Which of the following materials is known for its ability to undergo large deformation before rupturing?

• Plastic

• Elastic

• Brittle

• Ductile

A bar of diameter 30mm is subjected to a tensile load such that the measured extension on a gauge length of 200mm is 0.09mm and the change in diameter is 0.0045mm. Calculate the Poissons ratio?

• 1/3

• 1/4

• 1/5

• 1/6

The length, Young’s modulus and coefficient of thermal expansion of bar P are twice that of bar Q. what will be the ration of stress developed in bar P to that in bar Q if the temperature of both bars is increased by the same amount?

• 2

• 4

• 8

• 16

What will be the stress induced in the rod if the height through which load is dropped is zero?

• P/A

• 2P/A

• P/E

• 2P/E

The stress which acts in a direction perpendicular to the area is called ____________

• Shear stress
  

• Normal stress

• Thermal stress

• None of the mentioned