FAQ’s from Strength of Materials

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1. A cable with a uniformly distributed load perhorizontal metre run will take the following shape

1. straight line

2. parabola

3. hyperbola

4. elliptical

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2. 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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3. 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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4. A pair of smith’s tongs is an example of the lever of

1. zeioth order

2. first order

3. second order

4. third order

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5. 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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6. 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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7. 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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8. 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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9. 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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10. 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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11. 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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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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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18. 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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19. 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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20. A key is subjected to side pressure as well at shearingforces. These pressures are called

1. bearing stresses

2. fatigue stresses

3. crushing stresses

4. resultant stresses

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21. 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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22. A boiler shell 200 cm diameter and plate thickness 1.5cm is subjected to internal pressure of 1.5 MN/m , thenthe hoop stress will be

1. 30 MN/m2

2. 50 MN/m2

3. 100 MN/m2

4. 200 MN/m2

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23. 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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24. 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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25. 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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26. Rivets are made of following type of material

1. tough

2. hard

3. resilient

4. ductile

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27. 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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28. 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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29. 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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30. Proof resilience per material is known as

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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31. 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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32. 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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33. 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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34. 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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35. 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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36. 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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37. 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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38. 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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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. 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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41. 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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42. 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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43. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

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44. 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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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. 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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47. 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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48. The ultimate tensile stress of mild steel compared toultimate compressive stress is

1. same

2. more

3. less

4. unpredictable.

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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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