Engineering :: Strength of Materials

@ : Home > Civil Engineering > Strength of Materials

21.

A bar of length L metres extends by l mm under a tensile force of P. The strain produced in the bar is

A.	l / L	B.	0.1 l / L
C.	0.01 l / L	D.	0.001 l / L

22.

The ultimate tensile stress for mild steel is

A.	equal to	B.	less than
C.	more than

23.

The maximum stress produced in a bar of tapering section is at

A.	smaller end	B.	larger end
C.	middle	D.	anywhere

24.

Modular ratio of the two materials is the ratio of

A.	linear stress to linear strain	B.	shear stress to shear strain
C.	their modulus of elasticities	D.	their modulus of rigidities

25.

The shear modulus of most materials with respect to the modulus of elasticity is

A.	equal to half	B.	less than half
C.	more than half	D.	none of these

26.

A rod is enclosed centrally in a tube and the assembly is lightened by rigid washers. If the assembly is subjected to a compressive load, then

A.	rod is under compression	B.	tube is under compression
C.	both rod and tube are under compression	D.	rube is under tension and rod is under compression

27.

A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then

A.	bolt and tube are under tension	B.	bolt and tube are under compression
C.	bolt is under compression and tube is under tension	D.	bolt is under tension and tube is under compression

28.

When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is

A.	tensile stress	B.	compressive stress
C.	shear stress	D.	thermal stress

29.

A steel bar of 5 mm is heated from 15?C to 40?C and it is free to expand. The bar will induce

A.	no stress	B.	shear stress
C.	tensile stress	D.	compressive stress

30.

When a bar is cooled to -5?C, it will develop

A.	no stress	B.	shear stress
C.	tensile stress	D.	compressive stress