Strength of Materials Objective Type Questions and Answers Pdf Free Download
1. Which of the following is not a vector quantity
A. weight
B. velocity
C. acceleration
D. force
Answer: Option A
2. A number of forces acting at a point will be in equilibrium if
A. Their total sum is zero
B. Two resolved parts in two directions at right angles are equal
C. Sum of resolved parts in any two perpendicular directions are both zero
D. All of them are inclined equally
Answer: Option C
3. Which of the following is not the unit of energy
A. kg m
B. kcal
C. wattr
D. watt hours
Answer: Option C
4. The possible loading in various members of framed structures are
A. compression or tension
B. buckling or shear
C. shear or tension
D. all of the above
Answer: Option A
5. Tangent of angle of friction is equal to
A. kinetic friction
B. limiting friction
C. angle of repose
D. coefficient of friction
Answer: Option D
Strength of Materials Objective Type Questions and Answers Pdf Free Download
6. If three forces acting in different planes can be represented by a triangle, these will be in
A. non-equilibrium
B. partial equilibrium
C. full equilibrium
D. unpredictable
Answer: Option A
7. The unit of power in S.I. units is
A. newton meter
B. watt
C. joule
D. kilogram meter/sec.
Answer: Option B
8. Coulomb friction is the friction between
A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
Answer: Option A
9. In ideal machines
A. mechanical advantage is greater than velocity ratio
B. mechanical advantage is equal to velocity ratio
C. mechanical advantage is less than velocity ratio
D. mechanical advantage is unity
Answer: Option B
10. The weight of a body is due to
A. centripetal force of earth
B. gravitational pull exerted by the earth
C. force of attraction experienced by par-ticles
D. gravitational force of attraction towards the centre of the earth.
Answer: Option D
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11. The unit of work or energy in S.I. units is
A. newton
B. pascal
C. watt
D. joule.
Answer: Option D
12. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
A. along the plane
B. horizontally
C. vertically
D. at an angle equal to the angle of friction to the inclined plane
Answer: Option D
13. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
A. meet in a point
B. be all parallel
C. at least two of them must meet
D. all the above are correct
Answer: Option D
14. According to principle of transmissibility of forces, the effect of a force upon a body is
A. Maximum when it acts at the center of gravity of a body
B. Different at different points in its line of action
C. The same at every point in its line of action
D. Minimum when it acts at the C.G. of the body
Answer: Option C
15. Which of the following is not the unit of power ?
A. kW (kilowatt)
B. hp (horse power)
C. kg m/sec
D. kcal/kg sec.
Answer: Option D
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16. Coefficient of friction is the
A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
Answer: Option B
17. The coefficient of friction depends on
A. area of contact
B. shape of surfaces
C. strength of surfaces
D. nature of surface
Answer: Option D
18. Angle of friction is the
A. Angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The ratio of minimum friction force to the friction force acting when the body is just about to move
D. The ratio of minimum friction force to friction force acting when the body is in motion
Answer: Option A
19. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
A. ellipse
B. hyperbola
C. parabola
D. circle
Answer: Option B
20. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of
A. forces
B. independence of forces
C. balance of force
D. resolution of forces.
Answer: Option D
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21. Kinetic friction is the
A. Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion
Answer: Option D
22. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve
A. catenary
B. parabola
C. hyperbola
D. elliptical
Answer: Option B
23. Which of the following is not the unit of work, energy and heat ?
A. kcal
B. kg m
C. kWhr
D. hp
Answer: Option D
24. Pick up wrong statement about friction force for dry surfaces. Friction force is
A. proportional to normal load between the surfaces
B. dependent on the materials of contact surface
C. proportional to velocity of sliding
D. independent of the area of contact surfaces
Answer: Option C
25. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to
A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. Wan(a-)
Answer: Option C
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26. In the lever of third order, load W, effort P and fulcrum F are oriented as follows
A. W between P and F
B. F between W and P
C. P between W and F
D. W, P and F all on one side
Answer: Option A
27. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span
A. 2.5 cm
B. 3.0 cm
C. 4.0 cm
D. 5.0 cm
Answer: Option C
28. The product of either force of couple with the arm of the couple is called
A. resultant couple
B. moment of the forces
C. resulting couple
D. moment of the couple
Answer: Option D
29. The unit of force in S.I. units is
A. kilogram
B. newton
C. watt
D. dyne
Answer: Option B
30. Center of percussion is
A. the point of C.G.
B. the point of metacentre
C. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
D. point of suspension
Answer: Option C
132 top Strength of Materials Multiple Choice Questions and Answers pdf
31. Limiting force of friction is the
A. Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
B. Ratio of limiting friction and normal reaction
C. The friction force acting when the body is just about to move
D. The friction force acting when the body is in motion
Answer: Option C
32. Two coplanar couples having equal and opposite moments
A. Balance each other
B. Produce a couple and an unbalanced force
C. Are equivalent
D. Produce a moment of couple
Answer: Option D
33. The C.G. of a solid hemisphere lies on the central radius 3r
A. at distance — from the plane base 3r
B. at distance — from the plane base 3r
C. at distance — from the plane base 3r
D. at distance — from the plane base or
Answer: Option D
34. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
A. 38 m
B. 62.5 m
C. 96 m
D. 124 m
Answer: Option B
35. A cable with a uniformly distributed load per horizontal metre run will take the following shape
A. Straight line
B. Parabola
C. Hyperbola
D. Elliptical
Answer: Option B
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36. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than
A. Two members with unknown forces of the frame
B. Three members with unknown forces of the frame
C. Four members with unknown forces of the frame
D. Three members with known forces of the frame
Answer: Option B
37. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
A. density of metal can’t be determined
B. metal is twice as dense as water
C. metal will float in water
D. metal is twice as dense as unknown fluid
Answer: Option A
38. Which of the following is not a scalar quantity
A. mass
B. volume
C. density
D. acceleration.
Answer: Option D
39. If a number of forces act simultaneously on a particle, it is possible
A. Not a replace them by a single force
B. To replace them by a single force
C. To replace them by a single force through C.G.
D. To replace them by a couple
Answer: Option B
40. If a rigid body is in equilibrium under the action of three forces, then
A. these forces are equal
B. the lines of action of these forces meet in a point
C. the lines of action of these forces are parallel
D. (B) and (C) above
Answer: Option D
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41. If n = number of members andy = number of joints, then for a perfect frame, n =
A. 2j-1
B. 2j-2
C. 2j-3
D. 3j-2
Answer: Option C
42. A pair of smith’s tongs is an example of the lever of
A. zeioth order
B. first order
C. second order
D. third order
Answer: Option C
43. Alembert’s principle is used for
A. reducing the problem of kinetics to equivalent statics problem
B. determining stresses in the truss
C. stability of floating bodies
D. designing safe structures
Answer: Option A
44. The C.G. of a plane lamina will not be at its geometrical centre in the case of a
A. right angled triangle
B. equilateral triangle
C. square
D. circle
Answer: Option A
45. Effect of a force on a body depends upon
A. magnitude
B. direction
C. position or line of action
D. all of the above
Answer: Option D
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46. Frictional force encountered after commencement of motion is called
A. post friction
B. limiting friction
C. frictional resistance
D. dynamic friction.
Answer: Option D
47. A force is completely defined when we specify
A. magnitude
B. direction
C. point of application
D. all of the above
Answer: Option D
48. The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be
A. 20 kg, – ve sense
B. 20 kg, + ve sense
C. 10 kg, + ve sense
D. 10 kg, – ve sense
Answer: Option A
49. Which of the following is a vector quantity
A. energy
B. mass
C. momentum
D. angle
Answer: Option C
50. The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are
A. 2 and V6
B. 3 and 1 kg
C. V5 and V5
D. 2 and 5
Answer: Option C
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