Strength of materials (SOM)

ME3I

22306

Multiple Choice Questions (MCQs)

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Part 01
1   The Poisson’s ratio is equal to
    (A)   Lateral Strain /Longitudinal Strain
    (B)   Longitudinal Strain / Lateral Strain
    (C)   Longitudinal Strain x Lateral Strain
    (D)   None of the above
[showhide type=”button1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
2   According to Hook’s law, within elastic limit, stress is
    (A)   inversely proportional to strain
    (B)   directly proportional to strain
    (C)   does not depend on strain
    (D)   None of the above
[showhide type=”button2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
3   The Young’s modulus of elasticity of a material is 2.5 times its modulus of rigidity. The Poisson’s ratio for the material will be,
    (A)   0.25
    (B)   0.33
    (C)   0.50
    (D)   0.75
[showhide type=”button3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
4   For a given applied load, induced stress is a function___
    (A)   type of material of the body
    (B)   cross section area of the body
    (C)   both type of material and cross section of the body
    (D)   None of the above
[showhide type=”button4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
5   If a material expands freely due to heating, it will develop
    (A)   Thermal stress
    (B)   Tensile stress
    (C)   Compressive stress
    (D)   No stress
[showhide type=”button5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
6   The stress induced in a body when suddenly loaded is ________ the stress induced when the same load is applied gradually.
    (A)   equal to
    (B)   twice
    (C)   one-half
    (D)   four times
[showhide type=”button6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
7   The thermal stress is a function of:
    (A)   Coefficient of linear expansion
    (B)   Temperature rise
    (C)   Modulus of elasticity
    (D)   All of the above
[showhide type=”button7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
8   The energy stored in a body when strained within elastic limit is known as
    (A)   strain energy
    (B)   potential energy
    (C)   impact energy
    (D)   proof resilience
[showhide type=”button8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
9   The highest point on stress-strain diagram is called ____
    (A)   Yield point
    (B)   Ultimate point
    (C)   Fracture point
    (D)   Proportional limit
[showhide type=”button9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
10   Member connected in series subjected under certain external load , total deformation is the___
    (A)   Product of all deformation
    (B)   Sum of all deformation
    (C)   Maximum deformation from all deformation
    (D)   None of the above
[showhide type=”button10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
11   The moment of inertia of a circular section having 2 cm diameter about its diameter is _____mm4
    (A)   1.5708
    (B)   0.7854
    (C)   7853.9
    (D)   15707.9
[showhide type=”button11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
12   Parallel axis theorem is used for transfer of MI from _______axis to any other parallel coplanar axis.
    (A)   any vertical
    (B)   any horizontal
    (C)   centroidal
    (D)   None of the above
[showhide type=”button12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
13   The moment of inertia of quarter circle having radius ‘R’ about its centroidal axis is
    (A)   0.11R4
    (B)   0.055R4
    (C)   0.22R4
    (D)   0.35R4
[showhide type=”button13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
14   The moment of inertia of a triangular area having base 20mm and height 60mm about its centroidal axis is_____mm4
    (A)   36 x 104
    (B)   12 x 104
    (C)   18 x 104
    (D)   9 x 104
[showhide type=”button14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
15   For a particular figure, if Ixx = 20 mm4 , Izz = 60 mm4 , then Iyy will be ____
    (A)   80 mm4
    (B)   40 mm4
    (C)   3 mm4
    (D)   30 mm4
[showhide type=”button15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
16   The moment of inertia of a square section of size 1 unit about its diagonal is
    (A)   1/3
    (B)   1/4
    (C)   1/12
    (D)   1/6
[showhide type=”button16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
17   Uni-axial direct loading system produces _____
    (A)   one dimensional strain system
    (B)   two dimensional strain system
    (C)   three dimensional strain system
    (D)   no strain
[showhide type=”button17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
18   The relationship between Young’s modulus (E), Bulk modulus (K) and Poisson’s ratio (u) is given by
    (A)   E = 3K(1-2u)
    (B)   E = 3K(1-u)
    (C)   K = 3E(1-u)
    (D)   K = 3E(1-2u)
[showhide type=”button18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
19   The unit of Bulk Modulus is
    (A)   MPa
    (B)   N
    (C)   mm
    (D)   unitless
[showhide type=”button19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
20   When a member is subjected to a constant load over a long period of time, it undergoes a slow permanent deformation. This phenomenon is known as______
    (A)   Fatigue
    (B)   Creep
    (C)   Malleability
    (D)   Stiffness
[showhide type=”button20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
21   A tensile force (P) is acting on a body of length (L) and area of cross section (A). The change in length would be___
    (A)   P/AEL
    (B)   PL/AE
    (C)   PE/AL
    (D)   AL/PE
[showhide type=”button21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
22   The ratio of shear stress to shear strain is called__
    (A)   Bulk Modulus
    (B)   Modulus of Elasticity
    (C)   Poisson’s ratio
    (D)   Modulus of Rigidity
[showhide type=”button22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
23   A steel bar of 40 mm x 40 mm square cross-section is subjected to an axial tensile load of 200 KN. If the length of bar is 2 m and E = 2 x 105 MPa, the elongation of the bar will be____
    (A)   1.25 mm
    (B)   2.70 mm
    (C)   4.05 mm
    (D)   5.40 mm
[showhide type=”button23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
24   Due to which mechanical property, the material can be rolled into thin sheets?
    (A)   Ductility
    (B)   Malleability
    (C)   Brittleness
    (D)   Hardness
[showhide type=”button24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
25   The Force (P) required to punch a hole in the plate having shearing area (A) and shear stress (τ ) is___
    (A)   P = τ/A
    (B)   P = A/τ
    (C)   P = τ x A
    (D)   P = τ + A
[showhide type=”button25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
26   The unit of stiffness is__
    (A)   N-m
    (B)   m/N
    (C)   N
    (D)   N/m
[showhide type=”button26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
27   The slope of the stress-strain curve in the elastic deformation region is___
    (A)   Elastic modulus
    (B)   Plastic modulus
    (C)   Poisson’s ratio
    (D)   None of the above
[showhide type=”button27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
28   The elongation of the bar under certain external load is depend on__
    (A)   applied load
    (B)   length of the bar
    (C)   material of the bar
    (D)   All of the above
[showhide type=”button28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]

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Part 02

1   When shear force at a point is zero, then bending moment is ______at that point.
    (A)   Zero
    (B)   minimum
    (C)   maximum
    (D)   None of the above
[showhide type=”button101″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
2   Bending moment at a simply supported end is
    (A)   Zero
    (B)   Maximum
    (C)   Minimum
    (D)   None of the above
[showhide type=”button102″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
3   A point along the length of a beam subjected to loads where bending moment changes its sign, is known as the point of____
    (A)   Inflection
    (B)   Maximum stress
    (C)   Zero shear force
    (D)   Contraflexure
[showhide type=”button103″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
4   A cantilever beam subjected to point load at its free end, then the shape of BMD is
    (A)   Triangular
    (B)   Rectangular
    (C)   Parabolic
    (D)   Trapezoidal
[showhide type=”button104″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
5   Maximum bending moment in a cantilever beam with uniformly distributed load (w /unit length) over whole length ‘L’ is
    (A)   wL2
    (B)   (wL2)/2
    (C)   (wL2)/4
    (D)   (wL2)/6
[showhide type=”button105″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
6   Maximum bending moment in a simply supported beam of length 1 m with a concentrated load 40N at its mid span is
    (A)   40 Nm
    (B)   20 Nm
    (C)   10 Nm
    (D)   5 Nm
[showhide type=”button106″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
7   Which is/are the following assumptions in a theory of simple bending___
    (A)   The stress-strain relationship is linear and elastic
    (B)   Young’s modulus is the same in tension and compression
    (C)   Section which are plane before bending remains plane after bending
    (D)   All of the above
[showhide type=”button107″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
8   If ‘σ’ be the bending stress, M = bending moment, I = moment of inertia, R = Radius of curvature and y = distance of the fiber from neutral axis. Then bending equation is,
    (A)   σ/y = M/I = E/R
    (B)   σ/I = M/y = E/R
    (C)   σ/R = M/I = E/y
    (D)   None of the above
[showhide type=”button108″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
9   If a circular section having diameter ‘D’ is subjected to a maximum bending moment ‘M’, then maximum bending stress is
    (A)   16M/πD3
    (B)   32M/πD3
    (C)   16M/πD2
    (D)   32M/πD2
[showhide type=”button109″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
10   Bending stress at neutral axis is
    (A)   Maximum
    (B)   Zero
    (C)   Cannot be zero
    (D)   None of the above
[showhide type=”button110″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
11   The part of the column section in which the load can be applied without causing tensile stress anywhere in the section is called
    (A)   Core of section
    (B)   Modulus of section
    (C)   Area of section
    (D)   None of the above
[showhide type=”button111″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
12   Section modulus (Z) of a beam is a function of
    (A)   Cross section only
    (B)   Type of loading only
    (C)   Both Cross section and type of loading
    (D)   None of the above
[showhide type=”button112″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
13   For circular section of diameter 100mm, the diameter of Core section is
    (A)   50mm
    (B)   12.5mm
    (C)   25mm
    (D)   100mm
[showhide type=”button113″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
14   The core of the rectangular section is of _____shape.
    (A)   Triangular
    (B)   Rectangular
    (C)   Circular
    (D)   Rhombus
[showhide type=”button114″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
15   A long shaft of diameter ‘d’ is subjected to torque ‘T’ at its ends. The maximum shear stress is equal to
    (A)   16T/πd3
    (B)   32T/πd3
    (C)   64T/πd3
    (D)   8T/πd3
[showhide type=”button115″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
16   The maximum shear stress induced in a power transmitting shaft is
    (A)   Directly proportional to torque being transmitted
    (B)   Inversely Proportional to the stress induced cube of its diameter
    (C)   Both a) and b)
    (D)   None of the above
[showhide type=”button116″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
17   The magnitude of stress induced in a shaft due to applied torque varies from
    (A)   maximum at the center to zero at the circumference
    (B)   zero at the center to maximum at the circumference
    (C)   maximum at the center to minimum but not zero at the circumference
    (D)   minimum but not zero at the center to maximum at the circumference
[showhide type=”button117″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
18   Two shafts in torsion will have equal strength if
    (A)   only diameters of the shafts are same
    (B)   only angle of twist of the shafts are same
    (C)   only material of the shafts is same
    (D)   only torque transmitting capacity of the shafts are same
[showhide type=”button118″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
19   A hollow shaft of same cross-sectional area and material as that of solid shaft transmit
    (A)   Same torque
    (B)   Lesser torque
    (C)   More torque
    (D)   cannot be predicted without more data
[showhide type=”button119″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
20   A solid circular shaft of 120 mm diameter is transmitting 100 KW power at 150 rpm. The intensity of maximum induced shear stress in the shaft is___
    (A)   32.42 MPa
    (B)   18.76 MPa
    (C)   25.40 MPa
    (D)   14.36 MPa
[showhide type=”button120″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
21   The ratio of average shear stress to the maximum shear stress in a beam with a rectangular cross section is___
    (A)   1
    (B)   2/3
    (C)   3/2
    (D)   2
[showhide type=”button121″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
22   What is the nature of distribution of shear stress in a rectangular cross section beam due to shear force?
    (A)   Linear
    (B)   Parabolic
    (C)   Hyperbolic
    (D)   Elliptic
[showhide type=”button122″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
23   Which of the following is/are correct about Torsion?
    (A)   Torsion is the twisting of an object caused by a moment acting in a plane parallel to the plane of cross section.
    (B)   Torsion is the twisting of an object caused by a moment acting in a plane perpendicular to the longitudinal axis of a member.
    (C)   Torsion is the twisting of an object caused by a moment acting about the longitudinal axis of a member.
    (D)   All of the above
[showhide type=”button123″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
24   The unit of Torque is
    (A)   N-m
    (B)   MPa
    (C)   mm4
    (D)   N
[showhide type=”button124″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
25   We can select ______value of diameter from diameter calculated on the basis of shear stress condition and angle of twist condition for overall safety.
    (A)   Higher
    (B)   Lower
    (C)   Average
    (D)   None of the above
[showhide type=”button125″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
26   A solid circular shaft is replaced by a hollow circular shaft of same material whose external diameter is twice the internal diameter. Both the shafts are required to transmit the same power at the same speed. If both the shafts are to have the same strength, then % saving in the weight is_____
    (A)   94.66
    (B)   60
    (C)   31.24
    (D)   21.69
[showhide type=”button126″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
27   When the body is subjected to eccentric load, then _____types of stresses will be produced in the body.
    (A)   only direct stress
    (B)   only bending stress
    (C)   both direct and bending stresses
    (D)   None of the above
[showhide type=”button127″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
28   Which of the following is/are the field examples of eccentric loading?
    (A)   Hook
    (B)   C-clamp
    (C)   Load applied on offset link
    (D)   All of the above
[showhide type=”button128″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]

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