# Practice Test: Question Set - 14

**1. A key is subjected to side pressure as well at shearing forces. These pressures are called**

- (A) Bearing stresses

- (B) Fatigue stresses

- (C) Crushing stresses

- (D) Resultant stresses

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

*D*) is subjected to an axial load (*W*), the stiffness of the spring is given by- (A)

*Cd⁴/D*

^{3}n- (B)

*Cd⁴/2D*

^{3}n- (C)

*Cd⁴/4D*

^{3}n- (D)

*Cd⁴/8D*

^{3}n**3. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm². Ultimate tensile strength of specimen is**

- (A) 4 tonnes/ cm²

- (B) 8 tonnes/ cm²

- (C) 16 tonnes/ cm²

- (D) 22 tonnes/ cm²

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

*σ*) in one plane accompanied by a simple shear stress (_{x}*τ*), the maximum shear stress is_{xy}- (A)

*(σ*

_{x}/2) + (1/2) × √(σ_{x}² + 4 τ²_{xy})- (B)

*(σ*

_{x}/2) - (1/2) × √(σ_{x}² + 4 τ²_{xy})- (C)

*(σ*

_{x}/2) + (1/2) × √(σ_{x}² - 4 τ²_{xy})- (D)

*(1/2) × √(σx² + 4 τ²*

_{xy})**5. The change in the unit volume of a material under tension with increase in its Poisson's ratio will**

- (A) Increase

- (B) Decrease

- (C) Remain same

- (D) Increase initially and then decrease

**6. A material capable of absorbing large amount of energy before fracture is known as**

- (A) Ductility

- (B) Toughness

- (C) Resilience

- (D) Shock proof

**7. The shear force at the ends of a simply supported beam carrying a uniformly distributed load of**

*w*per unit length is- (A) Zero at its
both ends

- (B)

*wl*at one end and -

*wl*at the other end

- (C)

*wl*/2 at one end and -

*wl*/ 2 at the other end

- (D)

*wl²*/2 at one end and -

*wl²*/ 2 at the other end

**8. Deformation per unit length in the direction of force is known as**

- (A) Strain

- (B) Lateral strain

- (C) Linear strain

- (D) Linear stress

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

- (A) The energy
stored in a body, when strained within elastic limit is known as strain energy.

- (B) The maximum
strain energy which can be stored in a body is termed as proof resilience.

- (C) The proof
resilience per unit volume of a material is known as modulus of resilience.

- (D) All of the
above

**10. Rupture stress is**

- (A) Breaking stress

- (B) Maximum load/original cross-sectional area

- (C) Load at breaking point/Area

- (D) Load at breaking point/neck area

**11. When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal**

- (A) Polar
moment of inertia

- (B) Polar
modulus

- (C) Diameter

- (D) Angle of
twist

**12. Longitudinal stress in a thin cylinder is**

- (A) Equal to the hoop stress

- (B) Twice the hoop stress

- (C) Half of the hoop stress

- (D) One fourth of hoop
stress

**13. A beam of uniform strength may be obtained by**

- (A) Keeping the
width uniform and varying the depth

- (B) Keeping the
depth uniform and varying the width

- (C) Varying
the width and depth both

- (D) Any
one of the above

**14. Which of the following has no unit?**

- (A) Kinematic viscosity

- (B) Surface tension

- (C) Bulk modulus

- (D) Strain

**15. The deformation of the bar per unit length in the direction of the force is known as**

- (A) Linear
strain

- (B) Lateral strain

- (C) Volumetric
strain

- (D) Shear strain

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