## Monday, May 4, 2015

### Free Model Paper and objective test on Strength of materials

Free Model Paper and objective test on Strength of materials
An objective test containing 25 model questions on strength of materials
1. A material obey’s Hooke’s law up to
(a) Plastic limit
(b) Elastic limit
(c) Yield point
(d) Limit of proportionality
2. The intensity of stress which causes unit strain
is called
(a) Unit stress
(b) Modulus of rigidity
(c) Bulk modulus
(d) Modulus of elasticity
3. Whitin elastic limit stress is
(a) Inversely proportional to strain
(b) Directly proportional to strain
(c) Square root of strain
(d) Equal to strain
4. The shape of cantilever for uniformly distributed
(a) Straight line
(b) Parabolic
(c) Parabolic
(d) Elliptical
5. A bar when subjected to an axial pull P
(a) Decrease in length and width and increase in
thickness
(b) Decrease in length and increase in width and
thickness
(c) Increase in length and decrease in Width and
thickness
(d) Increase in length, width and thickness.
6. Poissons’s ratio is the ratio of
(a) Stress and strain
(b) Modules of elasticity and strain
(c) Lateral strain and longitudinal strain
(d) None of these
7. A coil is cut into two halves, the stiffness of cut
coils will be
(a) Double
(b) Half
(c) Same
(d) None of these
8. If the radius of wire streched by a load is doubled,
then its Young’s modulus will
(a) Be doubled
(b) Be halved
(c) Become four times
(d) None of these
9. Principal planes are planes having
(a) Maximum shear stress
(b) No shear stress
(c) Minimum shear stress
(d) None of the above
10. Euler’s crippling load formula is valid for a columns having slenderless ratio (in terms
of effective length and minimum radius of gyration)
(a) Upto 12
(b) Upto 30
(c) Between 30 to 80
(d) Above 80 only
11. At the principal planes
(a) Normal stress is maximum or minimum and the
shear stress is zero
(b) Tensile and compressive stresses are zero
(c) Tensile stress is zero and the shear stress is
maximum.
(d) No stress acts
12. A cylindrical section having no joint is known as
(a) Jointless section
(b) Homogeneous section
(c) Perfect section
(d) Seamless section
13. Slope and deflection at a point in a loaded cantilever beam carrying several loads can be
found out by the
(a) Principle of least work
(b) Moment area method
(c) Double integration method
(d) Macualay’s method
14. A composite bar made of steel and copper is heated up. The stresses developed in steel and
copper will be
(a) Compressive and tensile
(b) Compressive and bending
(c) Bending and tensile
(d) Tensile and compressive
15 . The factor of safety considered in Euler’s formula for crippling load is
(a) 1
(b) 3
(c) 5
(d) 6
16. In I-section, the bending moment is resisted
mainly by
(a) Flanges only
(b) Web only
(c) Both by flanges and web
(d) None of the above
17. The rate of change of shear force at any section
is equal to
(a) Bending moment
(c) Deflection
18. If the depth of a rectangular beam is halved
the deflection for a beam carrying a mid point
(a) Halved
(b) Doubled
(c) Four times
(d) Eight times
19. Beams of uniform strength are better as
comapred to beams of uniform cross section as
they are Economical
(a) For short spans
(b) For large spans
(c) For heavy weight beams
(d) For light weight beams
20. A point of contraflexure occurs in a
(a) Simply supported beam
(b) Fixed beam
(c) Cantilever
(d) None of the above
21. Shear force diagram for a cantilever beam
carrying a uniformly distributed load over its
length is a
(a) Triangle
(b) Rectangle
(c) Hyperbola
(d) Parabola
22. Shear stress in a rectangular beam exhibits a
(a) Parabolic variation
(b) Linear variation
(c) Cubic variation
(d) None of the above
23. In T-section
(a) Both flange and web resists in the ratio of the
their areas of cross-section
(b) Only flanges resists shear
(c) Most of the shear is resisted by web only
(d) None of these
24. Mohr’s circle can be used to determine following
stress on inclined surface
(a) Principal stress
(b) Normal stress
(c) Tangential stress
(d) Maximum shear stress
(e) All of the above