FAQ’s from Strength of Materials

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1. In actual 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 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. 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. 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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7. A flywheel on a motor goes from rest to 1000 rpm in6 sec. The number of revolutions made is nearly equal to

1. 25

2. 50

3. 100

4. 250

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

1. kg m

2. kcal

3. wattr

4. watt hours

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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 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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12. Dynamic friction as compared to static friction is

1. same

2. more

3. less

4. may be less of more depending on nature of surfaces andvelocity

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13. 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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14. 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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15. 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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16. 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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17. 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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18. 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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19. 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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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. 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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22. Efficiency of a riveted joint is the ratio of its strength(max. load it can resist without failure) to the strength ofthe unpunched plate in

1. tension

2. compression

3. bearing

4. All of the above

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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. A non-yielding support implies that the

1. support is frictionless

2. support can take any amount of reaction

3. support holds member firmly

4. slope of the beam at the support is zero

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25. 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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26. 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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27. 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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28. 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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29. 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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30. 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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31. 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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32. 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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33. The property of a material by virtue of which it can bebeaten or rolled into plates is called

1. malleability

2. ductility

3. plasticity

4. elasticity

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34. 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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35. 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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36. 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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37. 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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38. The materials which exhibit the same elasticproperties in all directions are called

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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39. 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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40. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

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41. 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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42. 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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43. 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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44. Which of the following has no unit

1. kinematic viscosity

2. surface tension

3. bulk modulus

4. strain

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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. 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. 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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48. 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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49. 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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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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