Strength of Material (Part-4) (General Engineering) (SSC JE)

Total Questions: 50

11. Which one of the following substances has the largest value of Young's modulus ? [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (c) Iron
Solution:

12. A column is a structural member designed primarily to take which of the following type of load [RRB S.S.E. (Secunderabad) 01.09.2015 (Shift-I) ]

Correct Answer: (c) Compressive
Solution:

Column–Vertical structural member fixed at both ends and subjected to axial compressive load is called column.

13. Where (1/m) = Poisson’s ratio, E = Young’s modulus and C = Rigidity modulus, the relation between E and C is given as [NHPC JE (Civil) 04.04.2022 (Shift-II) / RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (b) E = 2C [1+(1/m)]
Solution:

14. If a bar of three different cross-sections (stepped) is subjected to an axial load of P (tensile), which of the following is true? [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (b) the total elongation of the bar will be the sum of the elongation of the individual sections
Solution:

In case of stepped bar subjected to an axial load of P is the total elongation of the bar will be the sum of the elongation of the individual sections.

15. The intensity of bending stress at any point in a beam varies directly with [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (c) distance of the point from the neutral axis
Solution:

16. A support is said to be non-yielding if [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (a) the beam has zero slope at the support
Solution:

A support is said to be non-yielding if the beam has zero slope at the support.
e.g

17. If two shafts of the same length, one of which is hollow transmit equal torques and have equal maximum stress then they should have equal [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (b) polar modulus of section
Solution:

18. When a body is subject to two direct tensile stresses A and B in two mutually perpendicular directions accompanied by a simple shear stress S, then in the Mohr’s circle method, the circle radius is taken as [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (c)
Solution:

19. Moment of inertia is a concept applicable in the case of [RRB JE (Ranchi) 04.01.2015 ]

Correct Answer: (a) a rotating body
Solution:

Moment of inertia–
• It is a measure of an objects resistance to change to its rotation.
• Also defined as the capacity of a cross-section to resist bending.
• It must be specified with respect to a chosen of axis of rotation.
• It is usually quantified in m4 or kgm2 . The total moment of inertia is due to the sum of masses at a distance from the axis of rotation

20. The behaviour shown by some materials by virtue of which, as the shear stress reduces continuously with the development in the plastic strain is called as : [RRB S.S.E. 03.09.2015 (Shift-II)]

Correct Answer: (b) Strain softening
Solution:

Strain softening is defined as the region in which the stress in the material is decreasing with an increase in strain.
• Strain hardening reduces ductility and increases brittleness.