# Practice Test: Question Set - 06

**1. When a closely-coiled helical spring of mean diameter (**

*D*) is subjected to an axial load (*W*), the deflection of the spring (*Î´*) is given by (where*d*= Diameter of spring wire,*n*= No. of turns of the spring, and*C*= Modulus of rigidity for the spring material)- (A)

*WD*

^{3}n/Cd⁴- (B) 2

*WD*

^{3}n/Cd⁴- (C) 4

*WD*

^{3}n/Cd⁴- (D) 8

*WD*

^{3}n/Cd⁴**2. Percentage reduction of area in performing tensile test on cast iron may be of the order of**

- (A) 50%

- (B) 25%

- (C) 0%

- (D) 15%

**3. For the beam shown in the below figure, the shear force diagram between**

*A*and*B*is- (A) A
horizontal line

- (B) A
vertical line

- (C) An
inclined line

- (D) A
parabolic curve

**4. When a body is subjected to a direct tensile stress**

*(Ïƒ*in one plane accompanied by a simple shear stress_{x})*(Ï„*, the maximum normal stress is_{xy})- (A)

*(Ïƒ*/2

_{x}*)*+

*(1/2)*×

*√(Ïƒ*+ 4

_{x}²*Ï„²*

_{xy})- (B)

*(Ïƒ*/2

_{x}*) - (1/2)*×

*√(Ïƒ*+ 4

_{x}²*Ï„²*

_{xy})- (C)

*(Ïƒ*/2

_{x}*)*+

*(1/2)*×

*√(Ïƒ*4

_{x}² -*Ï„²*

_{xy})- (D)

*(1/2)*×

*√(Ïƒx²*+

*4*

*Ï„²*

_{xy})**5. The materials which exhibit the same elastic properties in all directions are called**

- (A) Homogeneous

- (B) Inelastic

- (C) Isotropic

- (D) Isentropic

**6. Modulus of rigidity may be defined as the ratio of**

- (A) Linear
stress to lateral strain

- (B) Lateral
strain to linear strain

- (C) Linear
stress to linear strain

- (D) Shear
stress to shear strain

**7. The ratio of lateral strain to the linear strain within elastic limit is known as**

- (A) Young's modulus

- (B) Bulk modulus

- (C) Modulus of rigidity

- (D) Poisson's ratio

**8. In the below figure, the plastic range occurs**

- (A) Before point

*A*

- (B) Beyond
point

*A*

- (C) Between
points

*A*and

*D*

- (D) Between
points

*D*and

*E*

**9. Shear modulus is the ratio of**

- (A) Linear
stress to linear strain

- (B) Linear
stress to lateral strain

- (C) Volumetric
strain to linear strain

- (D) Shear
stress to shear strain

**10. The ratio of elongation in a prismatic bar due to its own weight (**

*W*) as compared to another similar bar carrying an additional weight (*W*) will be- (A) 1 : 2

- (B) 1 : 3

- (C) 1 : 4

- (D) 1 : 2.5

**11. The weakest section of a diamond riveting is the section which passes through**

- (A) The first row

- (B) The second row

- (C) The central row

- (D) One rivet hole of the
end row

**12. The shear force diagram for a simply supported beam carrying a uniformly distributed load of**

*w*per unit length, consists of- (A) One
right angled triangle

- (B) Two
right angled triangles

- (C) One
equilateral triangle

- (D) Two
equilateral triangles

**13. Hooke's law holds good up to**

- (A) Yield point

- (B) Limit of
proportionality

- (C) Breaking point

- (D) Elastic limit

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

- (A) The
stress is the pressure per unit area

- (B) The
strain is expressed in mm

- (C) Hook's
law holds good up to the breaking point

- (D) Stress
is directly proportional to strain within elastic limit

**15. The property of a material which allows it to be drawn into a smaller section is called**

- (A) Plasticity

- (B) Ductility

- (C) Elasticity

- (D) Malleability

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