Strength of materials true/false quiz-3

01. For biaxial stress, the planes of maximum shear are at right angles to each other and are inclined at 45° to the principal planes.
A) True
B) False

02. The shear force at a certain point on a beam changes sign from +ve value to ve value or vice versa. The bending moment at that point will be zero.
A) True
B) False

03. A shear stress across a plane, is always accompanied by a balancing shear stress across the plane and normal to it.
A) True
B) False

04. The torsional rigidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft.
A) True
B) False

05. The maximum bending moment of a simply supported beam with central point load lies at the point of loading.
A) True
B) False

06. The values of equivalent length (L) and actual length (l) of a column for both ends hinged is the same.
A) Yes
B) No

07. The stiffness of a closely-coiled helical spring is __________ proportional to number of turns.
A) Directly
B) Inversely

08. According to Euler's column theory, the crippling load of a column is given by p = π² EI/Cl². In the Euler's formula, the value of C for a column with one end fixed and the other end hinged, is 1/2.
A) True
B) False

09. When a rectangular beam is loaded longitudinally, the shear force develops on the top layer.
A) Agree
B) Disagree

10. A load which acts at a point on a beam is not called uniformly distributed load.
A) Agree
B) Disagree

11. On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress.
A) Agree
B) Disagree

12. The thermal stress __________ upon the cross-sectional area of the bar.
A) Depends
B) Does not depend

13. The total strain energy stored in a body is called proof resilience.
A) Agree
B) Disagree

14. A spring, when loaded, is permanently distorted and recover its original shape when the load is removed.
A) Agree
B) Disagree

15. In case of an over-reinforced beam, the depth of actual neutral axis is the same as that of the critical neutral axis.
A) True
B) False

16. The maximum shear stress is equal to the radius of Mohr's circle.
A) Correct
B) Incorrect

17. The bending moment at the ends of a simply supported beam will be zero.
A) Yes
B) No

18. When a body is subjected to a direct tensile stress (σ), the maximum normal stress is equal to the direct tensile stress.
A) Agree
B) Disagree

19. When a material is loaded within elastic limit, the material will regain its shape and size when the load is removed.
A) Agree
B) Disagree

20. The distance between the centres of rivets in adjacent rows of zigzag riveted joint, is called back pitch.
A) True
B) False



Answers
01. Answer: Option A
02. Answer: Option B
03. Answer: Option B
04. Answer: Option A
05. Answer: Option A
06. Answer: Option A
07. Answer: Option B
08. Answer: Option A
09. Answer: Option B
10. Answer: Option A
11. Answer: Option A
12. Answer: Option B
13. Answer: Option B
14. Answer: Option A
15. Answer: Option B
16. Answer: Option A
17. Answer: Option A
18. Answer: Option A
19. Answer: Option A
20. Answer: Option B