Objective Type Questions and Answers on SOM - Set 23 - ObjectiveBooks

# Practice Test: Question Set - 23

1. The shear force of a cantilever beam of length l and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is _________ at the fixed end.
(A) Zero
(B) wl/4
(C) wl/2
(D) wl

2. The modulus of elasticity for mild steel is approximately equal to
(A) 10 kN/mm²
(B) 80 kN/mm²
(C) 100 kN/mm²
(D) 210 kN/mm²

3. The direct stress induced in a long column is __________ as compared to bending stress.
(A) Same
(B) More
(C) Less
(D) Negligible

4. For a 25 mm hole drilled in plates, the diameter of rivet shank should be
(A) 23 mm
(B) 24.5 mm
(C) 25 mm
(D) 26 mm

5. The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.
(A) Equal to
(B) Half
(C) One-third
(D) Two-third

6. A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then
(A) Bolt and tube are under tension
(B) Bolt and tube are under compression
(C) Bolt is under compression and tube is under tension
(D) Bolt is under tension and tube is under compression

7. Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is __________ as that of shaft 'A'.
(A) 1/6
(B) 1/8
(C) 1/4
(D) 15/16

8. Mohr's circle is used to determine the stresses on an oblique section of a body subjected to
(A) Direct tensile stress in one plane accompanied by a shear stress
(B) Direct tensile stress in two mutually perpendicular directions
(C) Direct tensile stress in two mutually perpendicular directions accompanied by a simple shear stress
(D) All of the above

9. A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poisson’s ratio of the bar in tension will be __________ the Poisson's ratio for the bar in compression.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

10. The assumption, generally, made in the theory of simple bending is that
(A) The beam material is perfectly homogeneous and isotropic
(B) The beam material is stressed within its elastic limit
(C) The plane sections before bending remain plane after bending
(D) All of the above

11. When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend its length, the stress and strain induced is
(A) Compressive stress, tensile strain
(B) Tensile stress, compressive strain
(C) Tensile stress, tensile strain
(D) Compressive stress, compressive strain

12. The thermal stress in a bar is __________ proportional to the change in temperature.
(A) Directly
(B) Indirectly
(C) Both A and B
(D) None of these

13. A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The minimum normal stress will be
(A) -100 MPa
(B) 250 MPa
(C) 300 MPa
(D) 400 MPa

14. For the beam shown in the below figure, the shear force at A is equal to

(A) wl/6
(B) wl/3
(C) wl
(D) 2wl/3

15. The maximum shear stress developed in a beam of circular section is __________ the average shear stress.
(A) Equal to
(B) 4/3 times
(C) 1.5 times
(D) Twice

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