FAQ’s from Strength of Materials

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1. In ideal machines

1. mechanical advantage is greater than velocity ratio

2. mechanical advantage is equal to velocity ratio

3. mechanical advantage is less than velocity ratio

4. mechanical advantage is unity

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2. In the lever of third order, load W, effort P andfulcrum F are oriented as follows

1. W between P and F

2. F between W and P

3. P between W and F

4. W, P and F all on one side

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3. 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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4. The C.G. of a plane lamina will not be at itsgeometrical centre in the case of a

1. right angled triangle

2. equilateral triangle

3. square

4. circle

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5. 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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6. 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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7. 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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8. 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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9. The maximum frictional force which comes into playwhen a body just begins to slide over another surface iscalled

1. limiting friction

2. sliding friction

3. rolling friction

4. kinematic friction

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10. If three forces acting in one plane upon a rigid body,keep it in equilibrium, then they must either

1. meet in a point

2. be all parallel

3. at least two of them must meet

4. all the above are correct

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11. 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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12. A semi-circular disc rests on a horizontal surface withits top flat surface horizontal and circular portiontouching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to bepulled by a horizontal force applied at one edge and italways remains horizontal. When the disc is about tostart moving, its top horizontal force will

1. remain horizontal

2. slant up towards direction of pull

3. slant down towards direction of pull

4. unpredictable

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13. 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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14. A projectile is fired at an angle 9 to the vertical. Itshorizontal range will be maximum when 9 is

1. 0°

2. 30°

3. 45°

4. 60°

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15. 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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16. 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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17. Rivets are made of following type of material

1. tough

2. hard

3. resilient

4. ductile

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18. The distance between the centres of the rivets inadjacent rows of zig-zag riveted joint is known as

1. pitch

2. back pitch

3. diagonal pitch

4. diametral pitch

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19. 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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20. 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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21. The ratio of elongation in a prismatic bar due to itsown weight (W) as compared to another similar barcarrying an additional weight (W) will be

1. 1:02

2. 1:03

3. 1:04

4. 01:03.0

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22. A beam is loaded as cantilever. If the load at the end isincreased, the failure will occur

1. in the middle

2. at the tip below the load

3. at the support

4. anywhere

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23. 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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24. Proof resilience per material is known as

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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25. The maximum strain energy that can be stored in abody is known as

1. impact energy

2. resilience

3. proof resilience

4. modulus of resilience

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26. 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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27. Flow stress corresponds to

1. fluids in motion

2. breaking point

3. plastic deformation of solids

4. rupture stress

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28. 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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29. The ratio of lateral strain to the linear strain withinelastic limit is known as

1. Young’s modulus

2. bulk modulus

3. Poisson’s ratio.

4. modulus of elasticity

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30. The elasticity of various materials is controlled by its

1. ultimate tensile stress

2. proof stress

3. stress at yield point

4. stress at elastic limit

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31. Rupture stress is

1. breaking stress

2. maximum load/original cross-sectional area

3. load at breaking point/A

4. load at breaking point/neck area

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32. 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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33. In the tensile test, the phenomenon of slow extensionof the material, i. e. stress increasing with the time at aconstant load is called

1. creeping

2. yielding

3. breaking

4. plasticity

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34. The stress developed in a material at breaking pointin extension is called

1. breaking stress

2. fracture stress

3. yield point stress

4. ultimate tensile stress

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35. The property of a material which allows it to be drawninto a smaller section is called

1. plasticity

2. ductility

3. elasticity

4. malleability

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36. Poisson’s ratio is defined as the ratio of

1. longitudinal stress and longitudinal strain

2. longitudinal stress and lateral stress

3. lateral stress and longitudinal stress

4. lateral stress and lateral strain

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37. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

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38. 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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39. 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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40. Which of the following has no unit

1. kinematic viscosity

2. surface tension

3. bulk modulus

4. strain

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41. 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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42. 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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43. A thin mild steel wire is loaded by adding loads in equalincrements till it breaks. The extensions noted withincreasing loads will behave as under

1. uniform throughout

2. increase uniformly

3. first increase and then decrease

4. increase uniformly first and then increase rapidly

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44. Modulus of rigidity is defined as the ratio of

1. longitudinal stress and longitudinal strain

2. volumetric stress and volumetric strain

3. lateral stress and lateral strain

4. shear stress and shear strain

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45. It equal and opposite forces applied to a body tend toelongate it, the stress so produced is called

1. internal resistanpe

2. tensile stress

3. transverse stress

4. compressive stress

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46. Deformation per unit length in the direction of force isknown as

1. strain

2. lateral strain

3. linear strain

4. linear stress

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47. The unit of Young’s modulus is

1. mm/mm

2. kg/cm

3. kg

4. kg/cm2

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48. Young’s modulus is defined as the ratio of

1. volumetric stress and volumetric strain

2. lateral stress and lateral strain

3. longitudinal stress and longitudinal strain

4. shear stress to shear strain

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49. Hooke’s law holds good up to

1. yield point

2. limit of proportionality

3. breaking point

4. elastic limit

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50. Strain is defined as the ratio of

1. change in volume to original volume

2. change in length to original length

3. change in cross-sectional area to original cross-sectional area

4. any one of the above

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