# Practice Test: Question Set - 03

**1. The yield moment of a cross section is defined as the moment that will just produce the yield stress in**

- (A) The outer
most fibre of the section

- (B) The inner
most fibre of the section

- (C) The
neutral fibre of the section

- (D) The fibre everywhere

**2. If**

*I*and_{x}*I*are the moments of inertia of a section about_{y}*X*and*Y*axes, the polar moment of inertia of the section, is- (A) (

*I*+

_{X}*I*)/2

_{Y}- (B) (

*I*-

_{X}*I*)/2

_{Y}- (C)

*I*+

_{X}*I*

_{Y}- (D) (

*I*/

_{X}*I*)

_{Y}**3. A simply supported beam carries varying load from zero at one end and**

*w*at the other end. If the length of the beam is*a*, the maximum bending moment will be- (A)

*wa*/27

- (B)

*wa*

^{2}/27

- (C)

*w*

^{2}

*a*/√27

- (D)

*wa*

^{2}/9√3

**4. The forces acting on the bar as shown in the given figure introduce**

- (A) Compressive
stress

- (B) Tensile
stress

- (C) Shear stress

- (D) None of
these

**5. If**

*E*,*N*,*K*and 1/*m*are modulus of elasticity, modulus of rigidity. Bulk modulus and Poisson ratio of the material, the following relationship holds good- (A)

*E*= 3

*K*(1 - 2/

*m*)

- (B)

*E*= 2

*N*(1 + 1/

*m*)

- (C) (3/2)

*K*(1 - 2/

*m*) =

*N*(1 + 1/

*m*)

- (D) All the
above

**6. Gradually applied static loads do not change with time their**

- (A) Magnitude

- (B) Direction

- (C) Point
of application

- (D) All the
above

**7. The tangential component of stress on an plane inclined Î¸° to the direction of the force, may be obtained by multiplying the normal stress by**

- (A) sin Î¸

- (B) cos Î¸

- (C) tan Î¸

- (D) sin

^{2}Î¸

**8. A body is said to be in equilibrium if**

- (A) It
moves horizontally

- (B) It
moves vertically

- (C) It rotates
about its C.G.

- (D) None of
these

**9. Pick up the incorrect statement from the following: The torsional resistance of a shaft is directly proportional to**

- (A) Modulus
of rigidity

- (B) Angle of
twist

- (C) Reciprocal
of the length of the shaft

- (D) Moment
of inertia of the shaft section

**10. The forces acting normally on the cross section of a bar shown in the given figure introduce**

- (A) Compressive
stress

- (B) Tensile
stress

- (C) Shear stress

- (D) None of
these

**11. A material is said to be perfectly elastic if**

- (A) It regains
its original shape on removal of the load

- (B) It regains
its original shape partially on removal of the load

- (C) It does not
regain its original shape at all

- (D) None of
these

**12. A shaft rotating**

*N.R.M.*under a torque*T*, transmits a power- (A)

*TÏ€N*/30 Newton meters/sec

- (B)

*TÏ€N*/30 Newton meters/min

- (C)

*TÏ€N*/60 Newton meters/min

- (D)

*TÏ€N*/60 Newton meters/sec

**13. If**

*Q*is load factor,*S*is shape factor and*F*is factor of safety in elastic design, the following:- (A)

*Q = S*+

*F*

- (B)

*Q = S*-

*F*

- (C)

*Q = F*-

*S*

- (D)

*Q = S*×

*F*

**14. The maximum deflection due to a load**

*W*at the free end of a cantilever of length*L*and having flexural rigidity*EI*, is- (A)

*WL*

^{2}/2

*EI*

- (B)

*WL*

^{2}/3

*EI*

- (C)

*WL*

^{3}/2

*EI*

- (D)

*WL*

^{3}/3

*EI*

**15. Pick up the correct statement from the following:**

- (A) For a
uniformly distributed load, the shear force varies linearly

- (B) For a
uniformly distributed load, B.M. curve is a parabola

- (C) For a load
varying linearly, the shear force curve is a parabola

- (D) All the
above

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