FAQ’s from Strength of Materials

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1. A cable with a uniformly distributed load perhorizontal metre run will take the following shape

1. straight line

2. parabola

3. hyperbola

4. elliptical

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2. The angle which an inclined plane makes with thehorizontal when a body placed on it is about to movedown is known as angle of

1. friction

2. limiting friction

3. repose

4. kinematic friction

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3. Which of the following is the example of lever of firstorder

1. arm of man

2. pair of scissors

3. pair of clinical tongs

4. all of the above

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4. The M.I. of hollow circular section about a centralaxis perpendicular to section as compared to its M.I.about horizontal axis is

1. same

2. double

3. half

4. four times

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5. The C.G. of a right circular solid cone of height h liesat the following distance from the base

1. h/2

2. J/3

3. h/6

4. h/4

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6. If three forces acting in different planes can berepresented by a triangle, these will be in

1. non-equilibrium

2. partial equilibrium

3. full equilibrium

4. unpredictable

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7. The C.G. of a solid hemisphere lies on the centralradius 3r

1. at distance — from the plane base 3r

2. at distance — from the plane base 3r

3. at distance — from the plane base 3r

4. at distance — from the plane base or

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8. A sample of metal weighs 219 gms in air, 180 gms inwater, 120 gms in an unknown fluid. Then which iscorrect statement about density of metal

1. density of metal can’t be determined

2. metal is twice as dense as water

3. metal will float in water

4. metal is twice as dense as unknown fluid

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9. Which of the following is the locus of a point thatmoves in such a manner that its distance from a fixedpoint is equal to its distance from a fixed line multipliedby a constant greater than one

1. ellipse

2. hyperbola

3. parabola

4. circle

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10. If n = number of members andy = number of joints,then for a perfect frame, n =

1. j-2

2. 2j-l

3. 2/-3

4. 3/-2

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11. The necessary condition for forces to be inequilibrium is that these should be

1. coplanar

2. meet at one point

3. both a and b above

4. all be equal

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12. A particle inside a hollow sphere of radius r, havingcoefficient of friction -rr can rest upto height of

1. r/2

2. r/A

3. r/%

4. 0.134 r

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13. The algebraic sum of moments of the forces formingcouple about any point in their plane is

1. equal to the moment of the couple

2. constant

3. both of above are correct

4. both of above are wrong

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14. The effort required to lift a load W on a screw jackwith helix angle a and angle of friction

1. Wtan(a + <)>)

2. Wtan(a-<)>)

3. Wcos(a + <t>)

4. Wsin(a + <(>)

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15. A single force and a couple acting in the same planeupon a rigid body

1. balance each other

2. cannot balance each other

3. produce moment of a couple

4. are equivalent

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16. Coulomb friction is the friction between

1. bodies having relative motion

2. two dry surfaces

3. two lubricated surfaces

4. solids and liquids

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17. Shear stress induced in a shaft subjected to tensionwill be

1. maximum at periphery and zero at center

2. maximum at center

3. uniform throughout

4. none of the above

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18. If rain is falling in the opposite direction of themovement of a pedestrain, he has to hold his umbrella

1. more inclined when moving

2. less inclined when moving

3. more inclined when standing

4. less inclined when standing

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19. A key is subjected to side pressure as well at shearingforces. These pressures are called

1. bearing stresses

2. fatigue stresses

3. crushing stresses

4. resultant stresses

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20. The torsional rigidity of a shaft is expressed by the

1. maximum torque it can transmit

2. number of cycles it undergoes before failure

3. elastic limit up to which it resists torsion, shear and bendingstresses

4. torque required to produce a twist of one radian per unit lengthof shaft

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21. The safe twisting moment for a compound shaft isequal to the

1. maximum calculated value

2. minimum calculated value

3. mean value

4. extreme value

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22. A cylindrical section having no joint is known as

1. jointless section

2. homogeneous section

3. perfect section

4. seamless section.

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23. A boiler shell 200 cm diameter and plate thickness 1.5cm is subjected to internal pressure of 1.5 MN/m , thenthe hoop stress will be

1. 30 MN/m2

2. 50 MN/m2

3. 100 MN/m2

4. 200 MN/m2

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24. The force acting along the circumference will causestress in the walls in a direction normal to thelongitudinal axis of cylinder; this stress is called

1. longitudinal stress

2. hoop stress

3. yeiled stress

4. ultimate stress

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25. The deformation of a bar under its own weightcompared to the deformation of same body subjected to adirect load equal to weight of the body is

1. same

2. double

3. half

4. four times

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26. A riveted joint in which every rivet of a row isopposite to other rivet of the outer row, is known as

1. chain riveted joint

2. diamond riveted joint

3. criss-cross riveted joint

4. zig-zag riveted joint

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27. A riveted joint in which the number otrivets decreasefrom innermost to outer most row is called

1. chain riveted joint

2. diamond riveted joint

3. criss-cross riveted joint

4. zig-zag riveted joint

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28. If the rivets in adjacent rows are staggered and theoutermost row has only one rivet, the arrangement of therivets is called

1. chain riveting

2. zig zag riveting

3. diamond riveting

4. criss-cross riveting

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29. The stress induced in a body due to suddenly appliedload compared to when it is applied gradually is

1. same

2. half

3. two times

4. four times

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30. The total strain energy stored in a body is termed as

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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31. The energy absorbed in a body, when it is strainedwithin the elastic limits, is known as

1. strain energy

2. resilience

3. proof resilience

4. modulus of resilience

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32. Flow stress corresponds to

1. fluids in motion

2. breaking point

3. plastic deformation of solids

4. rupture stress

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33. The stress at which extension of the material takesplace more quickly as compared to the increase in load iscalled

1. elastic point of the material

2. plastic point of the material

3. breaking point of the material

4. yielding point of the material

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34. The ratio of direct stress to volumetric strain in caseof a body subjected to three mutually perpendicularstresses of equal intensity, is equal to

1. Young’s modulus

2. bulk modulus

3. modulus of rigidity

4. modulus of elasticity

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35. The stress necessary to initiate yielding is

1. considerably greater than that necessary to continue it

2. considerably lesser than that necessary to continue it

3. greater than that necessary to stop it

4. lesser than that necessary to stop it

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36. If a material expands freely due to heating it willdevelop

1. thermal stresses

2. tensile stress

3. bending

4. no stress.

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37. The change in the unit volume of a material undertension with increase in its Poisson’s ratio will ,

1. increase

2. decrease

3. remain same

4. increase initially and then decrease

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38. In a tensile test, near the elastic limit zone, the

1. tensile strain increases more quickly

2. tensile strain decreases more quickly

3. tensile strain increases in proportion to the stress

4. tensile strain decreases in proportion to the stress

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39. For which material the Poisson’s ratio is more thanunity

1. steel

2. copper

3. aluminium

4. none of the above.

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40. The property of a material by virtue of which a bodyreturns to its original, shape after removal of the load iscalled

1. plasticity

2. elasticity

3. ductility

4. malleability

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41. The materials which exhibit the same elasticproperties in all directions are called

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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42. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

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43. In a tensile test on mild steel specimen, the breakingstress as compared to ultimate tensile stress is

1. more

2. less

3. same

4. more/less depending on composition

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44. Which is the false statement about true stress-strainmethod

1. It does not exist

2. It is more sensitive to changes in both metallurgical andmechanical conditions

3. It gives, a more accurate picture of the ductility

4. It can be correlated with stress-strain values in other tests liketorsion, impact, combined stress tests etc.

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45. The value of modulus of elasticity for mild steel is ofthe order of

1. 2.1xl05 kg/cm2

2. 2.1 X 106 kg/cm2

3. 2.1 x 107 kg/cm2

4. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2.

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46. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and areaof cross-section at neck was 0.5 cm2. Ultimate tensilestrength of specimen is

1. 4 tonnes/cm2

2. 8 tonnes/cm2

3. 16 tonnes/cm2

4. 22 tonnes/cm2

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47. True stress-strain curve for materials is plottedbetween

1. load/original cross-sectional area and change in length/originallength

2. load/instantaneous cross-sectional area original area and log.

3. load/instantaneous cross-sectional area and change inlength/original length

4. load/instantaneous area and instantaneous area/original area

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48. The Young’s modulus of a wire is defined as the stresswhich will increase the length of wire compared to itsoriginal length

1. double

2. one-fourth

3. half

4. same amount

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49. Tensile strength of a material is obtained by dividingthe maximum load during the test by the

1. area at the time of fracture

2. original cross-sectional area

3. average of a and b

4. minimum area after fracture

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50. Hooke’s law holds good up to

1. yield point

2. limit of proportionality

3. breaking point

4. elastic limit

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