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51.

The ratio of shear modulus to the modulus of elasticity for a Poisson's ratio of 0.4 will be

A.	5 ? 7	B.	7 ? 5
C.	5 ? 14	D.	14 ? 5

52.

The Young's modulus of a material is 125 Gpa and Poissons ratio is 0.25. The modulus of rigidity of the material is

A.	30 GPa	B.	50 GPa
C.	80 GPa	D.	100 GPa

53.

Which of the following statement is wrong?

A.	The deformation of the bar per unit length in the direction of the force is called linear strain.	B.	The Poisson's ratio is the ratio of lateral strain to the linear strain.
C.	The ratio of change in volume to the original volume is called volumetric strain.	D.	The bulk modulus is the ratio of linear stress to the linear strain.

54.

A shear stress across a plane, is always accompanied by a balancing shear stress across the plane and normal to it.

True

False

55.

Within elastic limit, shear stress is

A.	equal to	B.	less than
C.	directly proportional to	D.	inversely proportional to

56.

Shear modulus is the ratio of

A.	linear stress to linear strain	B.	linear stress to lateral strain
C.	volumetric strain to linear strain	D.	shear stress to shear strain

57.

A localised compressive stress at the area of contact between two members is known as

A.	tensile stress	B.	bending stress
C.	crushing stress	D.	shear stress

58.

The planes, which carry no shear stress, are known as principal planes.

True

False

59.

When a body is subjected to a direct tensile stress (?) in one plane, then normal stress on an oblique section of the body inclined at an angle ? to the normal of the section is

A.	? cos ?	B.	? cos2 ?
C.	? sin ?	D.	? sin2 ?

60.

In the above question, the normal stress on an oblique section will be maximum, when ? is equal to

A.	0?	B.	30?
C.	45?	D.	90?