Strength of Materials Multiple Choice Questions
1- A load is said to be suddenly applied, if it
(A) Falls upon a body from a height
(B) Is placed upon a body at once
(C) Acts upon a body repeatedly
(D) Acts at a point of cross section of a body
2- Thermal stress is caused when the temperature of the body is
(A) increased
(B) decreased
(C) remains constant
(D) either (A) or (B)
3- Maximum shearing stress acts on a plane which is
(A) Normal to planes of maximum and minimum principal stresses
(B) Free of direct stresses
(C) Inclined to principal planes at any angle (0 < q < 45°)
(D) Inclined to principal planes at 45°
4- When the solid shaft is subjected to torsion, the shear stress induced in the shaft at its centre is
(A) Zero
(B) Minimum
(C) Maximum
(D) Average
5- Relationship between stress and strain gives
(A) Young’s Modulus of Elasticity
(B) Modulus of Rupture
(C) Poisson’s Ratio
(D) Modulus of deformation
6- When torque is transmitted by the shaft to the flange through the key then the key is subjected to
(A) Torsion
(B) Bending
(C) Shear
(D) No Stress
7- The part of a member is said to be in pure bending if
(A) no bending moment exists in that part.
(B) no shear force and no bending moment exists in that part
(C) shear force and bending moment are maximum
(D) no shear force exists in that part
8- A circular shaft when subjected to equal and opposite end couples whose axes coincide with axis of the shaft is said to be in
(A) pure torsion
(B) pure bending
(C) combined bending and torsion
(D) none of the above
9- An open coiled helical spring is subjected to an axial force, the wire of the spring is subjected to
(A) Direct shear only
(B) Combined shear and bending only
(C) Combined shear bending and twisting
(D) Combined shear and twisting only
10- The efficiency in resisting torsional moments by hollow shaft when compared to solid shaft is
(A) less
(B) more
(C) equal
(D) cannot be determined
11- A plane truss has five joints and six members. The truss is
(A) Perfect
(B) Redundant
(C) Deficient
(D) None of these
12- The point of contraflexure lies where
(A) shear force changes sign
(B) bending moment changes sign
(C) shear force is zero
(D) bending moment is maximum
13- The distribution of torsional shear stresses over cross section of shaft is ___
(A) maximum at outermost fiber and zero at the axis of rotation
(B) maximum at the axis of rotation and zero at outermost fiber
(C) constant over the cross section
(D) all of the options
14- The bending stress in a beam is less if its section modulus is
(A) high
(B) low
(C) zero
(D) none of the options
15- In simply supported beams, the slope is ___ at supports.
(A) Minimum
(B) Uniform
(C) Zero
(D) Maximum
16- The principal stresses in pure torsion are ___
(A) zero
(B) equal magnitude in tension and compression
(C) only tension
(D) only compression
17- The maximum stress in thick cylinder is
(A) radial stress
(B) hoop stress
(C) longitudinal stress
(D) none of the above
18- The resilience of steel can be found by integrating stress-strain curve up to the –
(A) Ultimate fracture point
(B) Upper yield point
(C) Lower yield point
(D) Elastic point
19- Which of the following relation is stated by Hooke’s law?
(A) stress is directly proportional to strain
(B) stress is inversely proportional to strain
(C) stress is directly proportional to square of strain
(D) stress is inversely proportional to square of strain
20- Resistance to elastic deformation is called as
(A) toughness
(B) resilience
(C) plasticity
(D) stiffness
ANSWERS:
1-(A), 2-(D), 3-(D), 4-(A), 5-(A), 6-(C), 7-(D), 8-(A), 9-(C), 10-(B), 11-(C), 12-(B), 13-(A), 14-(A), 15-(D), 16-(B), 17-(B), 18-(D), 19-(A), 20-(D)