# 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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