Free Online Practice test on Strength of materials - Set 13 - ObjectiveBooks
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# 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 (Ïƒx) and (Ïƒy) in two mutually perpendicular planes accompanied by a simple shear stress (Ï„xy), then minimum normal stress is
(A) (Ïƒx + Ïƒy)/2 + (1/2) × √[(Ïƒx - Ïƒy)² + 4 Ï„²xy]
(B) (Ïƒx + Ïƒy)/2 - (1/2) × √[(Ïƒx - Ïƒy)² + 4 Ï„²xy]
(C) (Ïƒx - Ïƒy)/2 + (1/2) × √[(Ïƒx + Ïƒy)² + 4 Ï„²xy]
(D) (Ïƒx - Ïƒy)/2 - (1/2) × √[(Ïƒx + Ïƒy)² + 4 Ï„²xy]

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.