FAQ’s from Strength of Materials

/50

1 / 50

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

2 / 50

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

3 / 50

3. 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

4 / 50

4. 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

5 / 50

5. 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

6 / 50

6. 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

7 / 50

7. 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

8 / 50

8. 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

9 / 50

9. 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.

10 / 50

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

11 / 50

11. Tangent of angle of friction is equal to

1. kinetic friction

2. limiting friction

3. angle of repose

4. coefficient of friction

12 / 50

12. 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

13 / 50

13. 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

14 / 50

14. 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

15 / 50

15. 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

16 / 50

16. 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

17 / 50

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

18 / 50

18. 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

19 / 50

19. 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

20 / 50

20. 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

21 / 50

21. 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

22 / 50

22. 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

23 / 50

23. 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

24 / 50

24. 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

25 / 50

25. 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

26 / 50

26. 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

27 / 50

27. 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

28 / 50

28. 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

29 / 50

29. 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

30 / 50

30. 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

31 / 50

31. The property of a material which allows it to be drawninto a smaller section is called

1. plasticity

2. ductility

3. elasticity

4. malleability

32 / 50

32. 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

33 / 50

33. The materials which exhibit the same elasticproperties in all directions are called

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

34 / 50

34. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

35 / 50

35. 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.

36 / 50

36. 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.

37 / 50

37. 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

38 / 50

38. Which of the following has no unit

1. kinematic viscosity

2. surface tension

3. bulk modulus

4. strain

39 / 50

39. For steel, the ultimate strength in shear as comparedto in tension is nearly

1. same

2. half

3. one-third

4. two-third

40 / 50

40. 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

41 / 50

41. The intensity of stress which causes unit strain iscalled

1. unit stress

2. bulk modulus

3. modulus of rigidity

4. modulus of elasticity

42 / 50

42. True stress-strain curve for materials is plottedbetween

1. load/original cross-sectional area and change in length/originallength

2. load/instantaneous cross-sectional area original area and log.

3. load/instantaneous cross-sectional area and change inlength/original length

4. load/instantaneous area and instantaneous area/original area

43 / 50

43. The impact strength of a material is an index of its

1. toughness

2. tensile strength

3. capability of being cold worked

4. hardness

44 / 50

44. 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

45 / 50

45. 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

46 / 50

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.

47 / 50

47. 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

48 / 50

48. Deformation per unit length in the direction of force isknown as

1. strain

2. lateral strain

3. linear strain

4. linear stress

49 / 50

49. 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

50 / 50

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

Your score is

© 2023 Civil Jobs Training, All rights reserved