Practice Test: Question Set - 21
1. The ductility of the material __________ with the decrease in percentage elongation of a specimen under tensile test.
- (A) Increases
- (B) Decreases
- (C) Remain same
- (D) None of
these
2. The length of a conical bar is l, diameter of base is d and weight per unit volume is w. It is fixes at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be
- (A) wl²/2E
- (B) wl²/4E
- (C) wl²/6E
- (D) wl²/8E
3. The ratio of linear stress to the linear strain is called
- (A) Modulus of
rigidity
- (B) Modulus of
elasticity
- (C) Bulk modulus
- (D) Poisson's
ratio
4. For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to __________ of the main circle.
- (A) One-half
- (B) One-third
- (C) One-fourth
- (D) One-eighth
5. 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
6. Whenever a material is loaded within elastic limit, stress is __________ strain.
- (A) Equal to
- (B) Directly
proportional to
- (C) Inversely
proportional to
- (D) None of
these
7. In the below figure, Hook's law holds good, for the portion from_________.
- (A) O to A
- (B) B to D
- (C) D to E
- (D) None of
these
8. The point of contraflexure occurs in
- (A) Cantilever
beams
- (B) Simply
supported beams
- (C) Overhanging
beams
- (D) Fixed beams
9. The bending moment of a cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is ________ at the fixed end.
- (A) wl/2
- (B) wl
- (C) wl²/2
- (D) wl²/6
10. The maximum deflection of a cantilever beam of length ‘l’ with a uniformly distributed load of ‘w’ per unit length is (where W = wl)
- (A) Wl³/3EI
- (B) Wl³/8EI
- (C) Wl³/16EI
- (D) Wl³/48EI
11. When a bar of length l, width b and thickness t is subjected to a pull of P, its
- (A) Length,
width and thickness increases
- (B) Length,
width and thickness decreases
- (C) Length
increases, width and thickness decreases
- (D) Length
decreases, width and thickness increases
12. A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the
- (A) Top of the
section
- (B) Bottom of
the section
- (C) Neutral
axis of the section
- (D) Junction of
web and flange
13. The maximum deflection of a fixed beam of length l carrying a central point load W is
- (A) wl³/48 EI
- (B) wl³/96 EI
- (C) wl³/192 EI
- (D) wl³/384 EI
14. The torque transmitted by a hollow shaft of outer diameter (D) and inner diameter (d) is
- (A) (π/4) × τ [(D² - d²)/d]
- (B) (π/16) × τ [(D³ - d³)/d]
- (C) (π/16) × τ [(D⁴ - d⁴)/d]
- (D) (π/32) × τ [(D⁴ - d⁴)/d]
15. At the neutral axis of a beam
- (A) The
layers are subjected to maximum bending stress
- (B) The
layers are subjected to minimum bending stress
- (C) The
layers are subjected to compression
- (D) The
layers do not undergo any strain
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