# Practice Test: Question Set - 25

**1. When a rectangular bar of length**

*l*, breadth*b*and thickness*t*is subjected to an axial pull of*P*, then linear strain (Îµ) is given by (where*E*= Modulus of elasticity)- (A)

*Îµ = P/b.t.E*

- (B)

*Îµ = b.t.E/P*

- (C)

*Îµ = b.t/P.E*

- (D)

*Îµ = P.E/b.t*

**2. Which of the following statement is correct?**

- (A) The size of
hole drilled in riveting plates is less than the actual size of rivet.

- (B) The center
to center distance between two consecutive rivets in a row is called margin.

- (C) Rivets
are generally specified by its shank diameter.

- (D) Tearing of
plates can be avoided by taking the pitch of rivets equal to 1.5 times the
diameter of rivet hole.

**3. A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at**

- (A) Apex of the
triangle

- (B) Mid
of the height

- (C) Center of
gravity of the triangle

- (D) Base
of the triangle

**4. The Young's modulus of a material is 125 GPa and Poisson’s ratio is 0.25. The modulus of rigidity of me material is**

- (A) 30 GPa

- (B) 50 GPa

- (C) 80 GPa

- (D) 100 GPa

**5. In the above question, the normal stress on an oblique section will be maximum, when Î¸ is equal to**

- (A) 0°

- (B) 30°

- (C) 45°

- (D) 90°

**6. In a simply supported beam carrying a uniformly distributed load w per unit length, the point of contraflexure**

- (A) Lies
in the center of the beam

- (B) Lies
at the ends of the beam

- (C) Depends
upon the length of beam

- (D) Does not
exist

**7. In case of eccentrically loaded struts __________ is preferred.**

- (A) Solid
section

- (B) Hollow
section

- (C) Composite
section

- (D) Reinforced
section

**8. In a thin cylindrical shell subjected to an internal pressure**

*p*, the ratio of longitudinal stress to the hoop stress is- (A) 1/2

- (B) 3/4

- (C) 1

- (D) 1.5

**9. The unit of modulus of elasticity is same as those of**

- (A) Stress,
strain and pressure

- (B) Stress,
force and modulus of rigidity

- (C) Strain,
force and pressure

- (D) Stress,
pressure and modulus of rigidity

**10. The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called**

- (A) Elastic
limit

- (B) Yield point

- (C) Ultimate
point

- (D) Breaking
point

**11. Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be**

- (A) 2 : 5

- (B) 5 : 2

- (C) 4 : 3

- (D) 3 : 4

**12. In a thick cylindrical shell subjected to an internal pressure (**

*p*), the maximum radial stress at the inner surface of the shell is- (A) Zero

- (B)

*p*(tensile)

- (C) -

*p*(compressive)

- (D) 2

*p*(tensile)

**13. When a body is subjected to direct tensile stresses (Ïƒ**

_{x}*and Ïƒ*_{y}) in two mutually perpendicular directions, accompanied by a simple shear stress Ï„_{xy}*,*then in Mohr's circle method, the circle radius is taken as- (A)

*[(Ïƒ*-

_{x}*Ïƒ*+

_{y})/2]*Ï„*

- (B)

*[(Ïƒ*+

_{x}*Ïƒ*+

_{y})/2]*Ï„*

- (C)

*(1/2)*×

*√[(Ïƒ*-

_{x}*Ïƒ*+

_{y})²*4Ï„²*

_{xy}]- (D)

*(1/2)*×

*√[(Ïƒ*+

_{x}*Ïƒ*+

_{y})²*4Ï„²*

_{xy}]**14. A section of beam is said to be in pure bending, if it is subjected to**

- (A) Constant
bending moment and constant shear force

- (B) Constant
shear force and zero bending moment

- (C) Constant
bending moment and zero shear force

- (D) None of the
above

**15. Modular ratio of the two materials is the ratio of**

- (A) Linear
stress to linear strain

- (B) Shear stress
to shear strain

- (C) Their
modulus of elasticities

- (D) Their
modulus of rigidities

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