Strength of Materials - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. A hollow shaft of same cross-section area as compared to a solid shaft transmit
(A) Same torque
(B) Less torque
(C) More torque
(D) Unpredictable

2. A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce
(A) No stress
(B) Shear stress
(C) Tensile stress
(D) Compressive stress

3. Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.
(A) The shaft 'B' has the greater diameter
(B) The shaft 'A' has the greater diameter
(C) Both are of same diameter
(D) None of these

4. The intensity of stress which causes unit strain is called
(A) Unit mass
(B) Modulus of rigidity
(C) Bulk modulus
(D) Modulus of Elasticity

5. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is
(A) (ro² - ri²)/ 2p ri²
(B) 2p ri²/ (ro² - ri²)
(C) p (ro² + ri²)/ (ro² - ri²)
(D) p (ro² - ri²)/ (ro² + ri²)

6. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
(B) Perpendicular to the axis of load
(C) Maximum moment of inertia
(D) Minimum moment of inertia

7. Strain energy is the
(A) Energy stored in a body when strained within elastic limits
(B) Energy stored in a body when strained up to the breaking of a specimen
(C) Maximum strain energy which can be stored in a body
(D) Proof resilience per unit volume of a material

8. The neutral axis of the cross-section a beam is that axis at which the bending stress is
(A) Zero
(B) Minimum
(C) Maximum
(D) Infinity

9. A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be
(A) Tensile in both the material
(B) Tensile in steel and compressive in copper
(C) Compressive in steel and tensile in copper
(D) Compressive in both the materials

10. Euler's formula holds good only for
(A) Short columns
(B) Long columns
(C) Both short and long columns
(D) Weak columns

11. The bending moment at a point on a beam is the algebraic ________ of all the moments on either side of the point.
(A) Sum
(B) Difference
(C) Multiplication
(D) None of the above

12. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
(A)
(B) 2t
(C) 4t
(D) 8t

13. Within elastic limit, stress is
(A) Inversely proportional to strain
(B) Directly proportional to strain
(C) Square root of strain
(D) Equal to strain

14. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
(A) 1/8
(B) 1/4
(C) 1/2
(D) 2

15. The deformation per unit length is called
(A) Tensile stress
(B) Compressive stress
(C) Shear stress
(D) Strain

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