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. 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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3. 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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4. 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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5. 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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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 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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9. 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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10. 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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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. 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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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. 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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17. 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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18. 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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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. 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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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 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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23. 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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24. Rivets are made of following type of material

1. tough

2. hard

3. resilient

4. ductile

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25. 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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26. 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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27. 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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28. 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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29. 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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30. 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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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. The maximum strain energy that can be stored in abody is known as

1. impact energy

2. resilience

3. proof resilience

4. modulus of resilience

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33. 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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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 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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36. 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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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 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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39. 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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40. 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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41. 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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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 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. 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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46. 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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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. It equal and opposite forces applied to a body tend toelongate it, the stress so produced is called

1. internal resistanpe

2. tensile stress

3. transverse stress

4. compressive stress

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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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