Solid Mechanics

On a principal plane, shear stress is

• maximum

• zero

• negative

• cannot be said

The angle between the plane of maximum shear stress and the plane of maximum normal stress is

• 0˚

• 60˚

• 90˚

• 45˚

Mohr's circle becomes a point under

• hydrostatic state of

  stress

• deviatoric sate of

  stress

• pure

  torsion

• none of the above

The stress vector acting on any arbitrary plane passing through a fixed point can be determined if

• the stress vector along three mutually perpendicular planes passing through that point is known

• the stress vector along two mutually perpendicular planes passing through that point is known

• the stress vector on a single plane passing through that point is known

• none of the above

What is the unit of strain?

• pascal

• meter

• no unit

• newton

 $\tau$  is the symbol for

• normal stress

• strain

• shear stress

• young modulas

Which of these cannot undergo deformation?

• A piece of wood

• Orange juice

• Rigid body

• Hydrogen gas

What relationship exists between applied force and strain?

• direct

• indirect

• none at all

The bulk modulus of three materials are listed below. Arrange them from highest to lowest compressibility.

A : 2 x 10¹⁰ N/m²

B : 4 x 10¹⁰ N/m²

C : 10 x 10¹⁰ N/m²

• A, B, C

• B, C, A

• C, B, A

A 1-m long cord is pulled by a force causing its length to change by 2mm. Determine the strain.

• 0.2

• 0.02

• 0.002