Engineering :: Strength of Materials

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31.

A bar of copper and steel form a composite system, which is heated to a temperature of 40?C. The stress induced in the copper bar will be

A.	tensile	B.	compressive
C.	shear	D.	zero

32.

The thermal stress in a bar is

directly

indirectly

33.

The thermal stress

depends

does not depend

34.

If there is a fall in the temperature of a composite body, then a member having greater coefficient of linear expansion will be subjected to compressive stress.

True

False

35.

The thermal or temperature stress is a function of

A.	increase in temperature	B.	modulus of elasticity
C.	coefficient of linear expansion	D.	all of these

36.

Which of the following statement is correct?

A.	The stress is the pressure per unit area.	B.	The strain is expressed in mm.
C.	Hook's law holds good upto the breaking point	D.	Stress is directly proportional to strain within elastic limit.

37.

The formation of the bar per unit length in the direction of the force is known as

A.	linear strain	B.	lateral strain
C.	volumetric strain	D.	whear strain

38.

Every direct stress is always accompanied by a strain in its own direction and an opposite kind of strain in every direction, at right angles to it. Such a strain is known as

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

39.

The ratio of the lateral strain to the linear strain is called

A.	modulus of elasticity	B.	modulus of rigidity
C.	bulk modulus	D.	Poisson's ratio

40.

Poisson's ratio is the ratio of linear strain to the volumetric strain.

True

False