FAQ’s from Strength of Materials

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1. 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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2. 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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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 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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5. A body moves, from rest with a constant accelerationof 5 m per sec. The distance covered in 5 sec is mostnearly

1. 38 m

2. 62.5 m

3. 96 m

4. 124 m

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6. Which of the following is not the unit of energy

1. kg m

2. kcal

3. wattr

4. watt hours

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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. 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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10. The co-efficient of friction depends upon

1. nature of surfaces

2. area of contact

3. shape of the surfaces

4. ail of the above.

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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. Kinetic friction is the

1. tangent of angle between normal reac-tion and the resultant ofnormal reac-tion and the limiting friction

2. ratio of limiting friction and normal reaction

3. the friction force acting when the body is just about to move

4. the friction force acting when the body is in motion

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13. Tangent of angle of friction is equal to

1. kinetic friction

2. limiting friction

3. angle of repose

4. coefficient of friction

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14. 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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15. 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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16. Limiting force of friction is the

1. tangent of angle between normal-reaction and the resultant ofnormal reaction and limiting friction

2. ratio of limiting friction and normal reaction

3. the friction force acting when the body is just about to move

4. the friction force acting when the body is in motion

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17. 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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18. The weakest section of a diamond riveting is thesection which passes through

1. the first row

2. the second row

3. the central row

4. one rivet hole of the end row

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19. Rivets are made of following type of material

1. tough

2. hard

3. resilient

4. ductile

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20. When two plates are butt together and riveted withcover plates with two rows of rivets, the joi;it is known as

1. lap point

2. butt joint

3. single riveted single cover butt joint

4. double riveted double cover butt joint

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21. 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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22. In riveted boiler joints, all stresses, shearing, bearingand tensile are based on the

1. size of rivet

2. size of the drilled or reamed hole

3. average of size of rivet and hole

4. smaller of the two

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23. In a prismatic member made of two materials sojoined that they deform equally under axial stress, theunit stresses in two materials are

1. equal

2. proportional to their respective moduli of elasticity

3. inversely proportional to their moduli of elasticity

4. average of the sum of moduli of elas-ticity

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24. 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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25. A material capable of absorbing large amount ofenergy before fracture is known as

1. ductility

2. toughness

3. resilience

4. shock proof

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26. 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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27. Resilience of a material is considered when it issubjected to

1. frequent heat treatment

2. fatigue

3. creep

4. shock loading

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28. 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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29. In question 56, the internal reaction in bottom 80 cmlength will be

1. same in both cases

2. zero in first case

3. different in both cases

4. data are not sufficient to determine same

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30. 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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31. 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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32. 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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33. 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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34. 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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35. The percentage reduction in area of a cast ironspecimen during tensile test would be of the order of

1. more than 50%

2. 25—50%

3. 10—25%

4. negligible.

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36. 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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37. The value of Poisson’s ratio for cast iron is

1. 0.1 to 0.2

2. 0.23 to 0.27

3. 0.25 to 0.33

4. 0.4 to 0.6

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

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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40. The buckling load for a given material depends on

1. slenderness ratio and area of cross-section

2. Poisson’s ratio and modulus of elasticity

3. slenderness ratio and modulus of elasticity

4. slenderness ratio, area of cross-section and modulus of elasticity

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41. 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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42. If a part is constrained to move and heated, it willdevelop

1. principal stress

2. tensile stress

3. compressive stress

4. shear stress

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43. The value of Poisson’s ratio for steel is between

1. 0.01 to 0.1

2. 0.23 to 0.27

3. 0.25 to 0.33

4. 0.4 to 0.6

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44. The total elongation produced in a bar of uniformsection hanging vertically downwards due to its ownweight is equal to that produced by a weight

1. of same magnitude as that of bar and applied at the lower end

2. half the weight of bar applied at lower end

3. half of the square of weight of bar applied at lower end

4. one-fourth of weight of bar applied at lower end

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45. For steel, the ultimate strength in shear as comparedto in tension is nearly

1. same

2. half

3. one-third

4. two-third

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46. The intensity of stress which causes unit strain iscalled

1. unit stress

2. bulk modulus

3. modulus of rigidity

4. modulus of elasticity

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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. 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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49. 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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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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