Mechanical Engineering :: Engineering-Mechanics
1. According to principle of conservation of energy, the total momentum of a system of masses in
any direction remains constant unless acted upon by an external force in that direction.
any direction remains constant unless acted upon by an external force in that direction.
A. True B. False
View Answer
Answer :: B
Explanation::
2. The friction experienced by a body, when in motion, is known as
A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction
View Answer
Answer :: B
Explanation::
3. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball
with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity
A. v B. v/2
C. v/4 D. v/8
C. v/4 D. v/8
View Answer
Answer :: B
Explanation::
4. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
A. Agree B. Disagree
View Answer
Answer :: A
Explanation::
5. The coefficient of restitution for elastic bodies is one.
A. Correct B. Incorrect
View Answer
Answer :: B
Explanation::
6. The velocity ratio in case of an inclined plane inclined at angle ? to the horizontal and
weight being pulled up the inclined plane by vertical effort is
weight being pulled up the inclined plane by vertical effort is
A. sin ?
B. cos ?
C. tan ?
D. cosec ?
View Answer
Answer :: A
Explanation::
7. The range of projectile on a downward inclined plane is __________ the range on upward inclined
plane for the same velocity of projection and angle of projection.
A. less than
B. more than
C. equal to
View Answer
Answer :: B
Explanation::
8. The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
A. depends
B. does not depend
View Answer
Answer :: B
Explanation::
9. A body of weight W is required to move up on rough inclined plane whose angle of inclination
with the horizontal is a. The effort applied parallel to the plane is given by(where µ = tanf = Coefficient
of friction between the plane and the body.)
A. P = W tana
B. P = W tan(a + f)
C. P = W (sina + µcosa)
D. P = W (cosa + µsina)
View Answer
Answer :: C
Explanation::
10. If the resultant of two equal forces has the same magnitude as either of the forces, then
the angle between the two forces is
A. 30° B. 60°
C. 90° D. 120°
C. 90° D. 120°
View Answer
Answer :: D
Explanation:
11. A smooth cylinder lying on its convex surface remains in __________ equilibrium.
A. stable B. unstable
C. neutral
View Answer
Answer :: B
Explanation::
12. Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
A. Yes B. No
View Answer
Answer :: A
Explanation::
13. Moment of inertia of a circular section about an axis perpendicular to the section is
A. pd3/16 B. pd3/32
C. pd4/32 D. pd4/64
View Answer
Answer :: C
Explanation::
15. The unit of angular acceleration is
A. N-m B. m/s
C. m/s2 D. rad/s2
View Answer
Answer :: D
Explanation::
16. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its
C.G. and parallel to the base, is
A. bh3/4 B. bh3/8
C. bh3/12 D. bh3/36
View Answer
Answer :: D
Explanation::
17. If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be
A. same B. half
C. double
View Answer
Answer :: B
Explanation::
18. Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body,
a = Acceleration of the body, and s = Displacement of the body in time t seconds.)
A. v = u + a.t
B. s = u.t + 1/2 a.t2
C. v2 = u2+2a.s
D. all of these
View Answer
Answer :: D
Explanation::
19. If a number of forces are acting at a point, theirresultant will be inclined at an angle ? with the horizontal, such that
A. tan ? = ?H/?V
B. tan ? = ?V/?H
C. tan ? = ?Vx?H
View Answer
Answer :: B
Explanation::
20 The above figure shows the two equal forces at right angles acting at a point. The value
of force R acting along their bisector and in opposite direction is
A. P/2
B. 2P
C.
D.
C.
D.
View Answer
Answer :: C
Explanation::
21. The force required to move the body up the plane will be minimum if it makes an angle
with the inclined plane __________ the angle of friction.
with the inclined plane __________ the angle of friction.
A. equal to
B. less than
C. greater than
View Answer
Answer :: A
Explanation::
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22. In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will
22. In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will
A. increase
B. decrease
C. remain the same
View Answer
Answer :: B
Explanation::
23. The total time taken by a projectile to reach maximum height and to return back to
the ground, is known as time of flight.
A. Yes B. No
View Answer
Answer :: A
Explanation::
25. The range of a projectile is maximum, when the angle of projection is
A. 30° B. 45°
C. 60° D. 90°
View Answer
Answer :: B
Explanation::
26. The mechanical advantage of a lifting machine is the ratio of
A. distance moved by effort to the distance moved by load
B. load lifted to the effort applied
C. output to the input
D. all of the above
View Answer
Answer :: B
Explanation::
27. Static friction is always __________ dynamic friction.
A. equal to
B. less than
C. greater than
View Answer
Answer :: C
Explanation::
28. A body will begin to move down an inclined plane if the angle of inclination of the plane
is __________ the angle of friction.
A. equal to
B. less than
C. greater than
View Answer
Answer :: C
Explanation::
29. When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.
A. Correct B. Incorrect
View Answer
Answer :: A
Explanation::
30. The bodies which rebound after impact are called
A. inelastic bodies
B. elastic bodies
C. neither elastic nor inelastic bodies
D. none of these
View Answer
Answer :: B
Explanation::
31. The maximum frictional force, which comes into play, when a body just begins
to slide over the surface of the other body, is known as
to slide over the surface of the other body, is known as
A. static friction
B. dynamic friction
C. limiting friction
D. coefficient of friction
View Answer
Answer :: C
Explanation::
32. The centre of gravity of an equilateral triangle with each side a, is __________ from any of the three sides.
A. 3a/2
B. 23a
C. a/23
D. 32a
View Answer
Answer :: C
Explanation::
33. The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.
A. Correct B. Incorrect
View Answer
Answer :: A
Explanation::
34. 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 known as
A. principle of independence of forces
B. principle of resolution of forces
C. principle of transmissibility of forces
D. none of these
View Answer
Answer :: B
Explanation::
35. The triangle law of forces states that if two forces acting simultaneously on a particle, be represented
in magnitude and direction by the two sides of a triangle taken in order, then their resultant may be
represented in magnitude and direction by the third side of a triangle, taken in opposite order.
A. True B. False
View Answer
Answer :: A
Explanation::
36. The angle between two forces when the resultant is maximum and minimum respectively are
A. 0° and 180°
B. 180° and 0°
C. 90° and 180°
D. 90° and 0°
View Answer
Answer :: A
Explanation::
37. The path of the projectile is a parabola.
A. True B. False
View Answer
Answer :: A
Explanation::
44. If two blocks of equal mass are attached to the two ends of a light string and one of the blocks is
placed over a smooth horizontal plane while the other is hung freely after passing over a smooth pulley,
then the two blocks will have some motion.
placed over a smooth horizontal plane while the other is hung freely after passing over a smooth pulley,
then the two blocks will have some motion.
A. Agree B. Disagree
View Answer
Answer :: A
Explanation::
45. During elastic impact, the relative velocity of the two bodies after impact is __________ the
relative velocity of the two bodies before impact.
A. equal to
B. equal and opposite to
C. less than
D. greater than
View Answer
Answer :: B
Explanation::
46. Work done is said to be zero, when
A. some force acts on a body, but displacement is zero
B. no force acts on a body but some displacement takes place
C. either (a) or (b)
D. none of the above
View Answer
Answer :: C
Explanation::
47. The force which acts along the radius of a circle and directed away from the centre of
the circle is called centrifugal force.
A. Agree B. Disagree
View Answer
Answer :: A
Explanation::
48. One watt is equal to
A. 0.1 joule/s
B. 1 joule/s
C. 10 joules/s
D. 100 joules/s
View Answer
Answer :: B
Explanation::
49. two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N.
It the line of action of the resultant is 6 mm from any given force, the two forces are
It the line of action of the resultant is 6 mm from any given force, the two forces are
A. 15 N and 5 N
B. 20 N and 5 N
C. 15 N and 15 N
D. none of these
View Answer
Answer :: A
Explanation::
50. If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum
of body having mass m1 is __________ the momentum of body having mass m2.
A. equal to
B. less than
C. greater than
View Answer
Answer :: C
Explanation::
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