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271.

Necking in case of ductile materials begins at the

A.	elastic limit point	B.	upper yield point
C.	lower yield point	D.	ultimate point

272.

If, for a given material, the modulus of elasticity is equal to twice its modulus of rigidity (G), then the bulk modulus is

A.	2 G	B.	0.33 G
C.	9 G	D.	0.67 G

273.

If the value of Young's modulus of elasticity for a material is zero, it implies that the material

A.	is in gaseous state	B.	is visco-elastic
C.	incompressible	D.	plastic

274.

The slenderness ratio of a column is zero when

A.	its length is exactly equal to radius of gyration	B.	its length is half the radius of gyration
C.	total load carried is less than half the dead weight	D.	its length is supported on all sides throughout its full length

275.

The force required to punch a 25 mm hole in a mild steel pipe 10 mm thich, when ultimate shear stress of the plate is 500 N/mm2 will be nearly

A.	78 kN	B.	98 kN
C.	393 kN	D.	158 kN

276.

The theory of failure considered appropriate for ductile materials is

A.	Rankines theory	B.	Beltrami's theory
C.	St. Venant theory	D.	Von Mises theory.

277.

A body is subjected to two normal stresses of 200 kN/m2 (tensile) and 100 kN/m2 (compressive) acting mutually perpendicular to each other. The maximum sher stress is equal to

A.	50 kN/m2	B.	100 kN/m2
C.	150 kN/m2	D.	300 kN/m2

278.

In case the modulus of elasticity for a material is 200 GN/m2 and Poisson's ratio is 0.25, the modulus of rigidity is

A.	250 GN/m2	B.	125 GN/m2
C.	80 GN/m2	D.	320 GN/m2

279.

A bar of copper form a composite system, which is heated to a temperature of 45?C. The stress in the copper bar will be

A.	tensile stress	B.	compressive stress
C.	bursting stress	D.	sher stress

280.

The strength of a riveted plate in tearing should be based on

A.	the rivet diameter	B.	the rivet hole diameter
C.	the average of (A) and (B) above	D.	the average of (A) and (B) above plus 2 mm.