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. 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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3. 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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4. 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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5. 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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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. 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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11. 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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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. 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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14. 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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15. 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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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. In a belt drive, the pulley diameter is doubled, the belttension and pulley width remaining same. The changesrequired in key will be

1. increase key length

2. increase key depth

3. increase key width

4. double all the dimensions

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19. The value of shear stress which is induced in the shaftdue to the applied couple varies

1. from maximum at the center to zero at the circumference

2. from zero at the center to maximum at the circumference

3. from maximum at the center to mini-mum at the cricumference

4. from minimum at the centro to maxi-mum at the circumference

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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 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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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. 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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24. 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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25. 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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26. 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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27. 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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28. 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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29. 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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30. 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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31. 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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32. Proof resilience per material is known as

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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33. When it is indicated that a member is elastic, it meansthat when force is applied, it will

1. not deform

2. be safest

3. stretch

4. not stretch

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34. 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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35. 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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36. 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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37. 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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38. 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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39. 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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40. 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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41. 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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42. The materials which exhibit the same elasticproperties in all directions are called

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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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. Which of the following has no unit

1. kinematic viscosity

2. surface tension

3. bulk modulus

4. strain

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45. 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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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. 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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48. 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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49. The unit of Young’s modulus is

1. mm/mm

2. kg/cm

3. kg

4. kg/cm2

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50. 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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