# Practice Test: Question Set - 13

**1. Which of the following materials is most elastic?**

- (A) Rubber

- (B) Plastic

- (C) Brass

- (D) Steel

**2. Strain is equal to (where**

*l*= Original length, and Î´*l*= Change in length)- (A)

*l/Î´l*

- (B)

*Î´l/l*

- (C)

*l.Î´l*

- (D)

*l*+

*Î´l*

**3. The ratio of direct stress to volumetric strain in case of a body subjected to three mutually perpendicular stresses of equal intensity, is equal to**

- (A) Young's modulus

- (B) Bulk modulus

- (C) Modulus of rigidity

- (D) Modulus of elasticity

**4. Which of the following statement is wrong?**

- (A) The
deformation of the bar per unit length in the direction of the force is called
linear strain.

- (B) The
Poisson's ratio is the ratio of lateral strain to the linear strain.

- (C) The ratio of
change in volume to the original volume is called volumetric strain.

- (D) The bulk
modulus is the ratio of linear stress to the linear strain.

**5. Diamond riveted joint can be adopted in the case of following type of joint**

- (A) Butt joint

- (B) Lap joint

- (C) Double riveted lap joints

- (D) All types of joints

**6. When a body is subjected to biaxial stress i.e. direct stresses (Ïƒ**

_{x}) and (Ïƒ_{y}) in two mutually perpendicular planes accompanied by a simple shear stress (Ï„_{xy}), then minimum normal stress is- (A)

*(Ïƒ*

_{x}+ Ïƒ_{y})/2 + (1/2) × √[(Ïƒ_{x}- Ïƒ_{y})² + 4 Ï„²_{xy}]- (B)

*(Ïƒ*

_{x}+ Ïƒ_{y})/2 - (1/2) × √[(Ïƒ_{x}- Ïƒ_{y})² + 4 Ï„²_{xy}]- (C)

*(Ïƒ*

_{x}- Ïƒ_{y})/2 + (1/2) × √[(Ïƒ_{x}+ Ïƒ_{y})² + 4 Ï„²_{xy}]- (D)

*(Ïƒ*

_{x}- Ïƒ_{y})/2 - (1/2) × √[(Ïƒ_{x}+ Ïƒ_{y})² + 4 Ï„²_{xy}]**7. The unit of Young's modulus is**

- (A) mm/mm

- (B) kg/cm

- (C) Kg

- (D) kg/cm²

**8. When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as**

- (A) Young's
modulus

- (B) Modulus
of rigidity

- (C) Bulk
modulus

- (D) Poisson's
ratio

**9. The value of modulus of elasticity for mild steel is of the order of**

- (A) 2.1 × 10⁵ kg/cm²

- (B) 2.1 × 10⁶ kg/cm²

- (C) 2.1 × 10⁷ kg/cm²

- (D) 0.1 × 10⁶ kg/cm²

**10. A pressure vessel is said to be a thick shell, when**

- (A) It is made
of thick sheets

- (B) The internal
pressure is very high

- (C) The ratio of
wall thickness of the vessel to its diameter is less than 1/10.

- (D) The ratio of
wall thickness of the vessel to its diameter is greater than 1/10.

**11. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is**

- (A) Same

- (B) Twice

- (C) Four times

- (D) Eight times

**12. The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is**

- (A) Same

- (B) Double

- (C) Half

- (D) Four times

**13. A continuous beam is one which is**

- (A) Fixed at
both ends

- (B) Fixed at one
end and free at the other end

- (C) Supported on
more than two supports

- (D) Extending
beyond the supports

**14. The radius of the Mohr’s circle in the given figure is equal to**

- (A) Sum
of two principal stresses

- (B) Difference
of two principal stresses

- (C) Half the sum
of two principal stresses

- (D) Half
the difference of two principal stresses

**15. The maximum shear stress, in the given figure, is equal to __________ of the Mohr's circle.**

- (A) Radius

- (B) Diameter

- (C) Circumference

- (D) Area

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