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. 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 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. 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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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. 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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8. 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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9. 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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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. 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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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 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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14. 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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15. 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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16. 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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17. 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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18. 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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19. Longitudinal stress in a thin cylinder is

1. half of the hoop stress

2. one-fourth of hoop stress

3. equal to the hoop stress

4. twice the hoop stress

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20. 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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21. 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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22. 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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23. Diamond riveted joint can be adopted in the case offollowing type of joint

1. butt joint

2. lap joint

3. double riveted lap joints

4. all types of joints

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24. 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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25. 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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26. The strain energy stored in a body due to suddenlyapplied load compared to when it is applied gradually is

1. same

2. twice

3. four times

4. eight times

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27. 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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28. 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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29. 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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30. 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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31. 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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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. 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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36. 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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37. 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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38. 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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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. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

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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 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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44. 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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45. 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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46. If the radius of wire stretched by a load is doubled,then its Young’s modulus will be

1. doubled

2. halved

3. become four times

4. remain unaffected.

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47. 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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48. The materials having same elastic properties in alldirections are called

1. ideal materials

2. uniform materials

3. isotropic materials

4. paractical materials

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49. The unit of Young’s modulus is

1. mm/mm

2. kg/cm

3. kg

4. kg/cm2

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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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