Engineering Mechanics Multiple Choice Questions(MCQs)& Answers
CONCEPTS & THEORIES
engineering-mechanicsEngineering mechanics is the application of mechanics to solve problems involving common engineering elements. The goal of Engineering Mechanics course is to expose students to problems in mechanics as applied to plausibly real-world scenarios. Problems of particular types are explored in detail in the hopes that students will gain an inductive understanding of the underlying principles at work.
Types of Engineering Mechanics:
Engineering mechanics can be classified into two types-
A. Statics: Statics is the branch of mechanics that deals with the study of objects at rest. Objects at rest may or may not be under the influence of forces.
B. Dynamics: Dynamics is the branch of mechanics that deals with the study of objects in motion and the forces causing such motion.
Dynamics can be further classified into two types-
1. Kinematics: Kinematics is the study of the motion of bodies without consideration of the cause of the motion. Kinematics deals with the space-time relationship of the motion of a body. Some examples of kinematic concepts are displacement, velocity and acceleration.
2. Kinetics: Kinetics is the branch of mechanics which deals with the study of the motion of bodies by considering the cause of motion.
Some basic terms used in Mechanics
Mass: The quantity of the matter possessed by a body is called mass. The mass of a body can not change unless the body is damaged and part of it is physically separated.
Length: It is a concept to measure linear distances.
Time: Time is the measure of succession of events. The successive event selected is the rotation of earth about its own axis and this is called a day.
Space: Any geometric region in which the study of a body has been done is called space.
Displacement: It is defined as the distance moved by a body/particle in the specified direction.
Velocity: The rate of change of displacement with respect to time is defined as velocity.
Acceleration: It is the rate of change of velocity with respect to time.
Momentum: The product of mass and velocity is called momentum. Thus
Momentum = Mass × Velocity
Particle: It can be defined as an object which has only mass and no size.
QUESTIONS
Engineering Multiple Choice Questions(MCQs)& Answers
1
three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
Answer: all the above are correct
2
A single force and a couple acting in the same plane upon a rigid body
Answer: cannot balance each other
3
The maximum frictional force which comes into play when a body just begins to slide over another surface is called
Answer: limiting friction
5
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to
Answer: Wtan(a + )
10
Limiting force of friction is the
Answer: the friction force acting when the body is just about to move
11
If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella
Answer: less inclined when standing
12
A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation
Answer: 6f-8
13
Pick up wrong statement about friction force for dry surfaces. Friction force is
Answer: proportional to velocity of sliding
16
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be
Answer: Gross vehicle mass
17
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be
Answer: upwards at its upper end
18
Which one of the following statements is not correct
Answer: the sine of the angle of repose is equal to coefficient to friction
20
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
Answer: at an angle equal to the angle of friction to the inclined plane
21
According to principle of transmissibility of forces, the effect of a force upon a body is
Answer: the same at every point in its line of action
24
The forces, which meet at one point, but their lines of action do not lie in a plane, are called
Answer: non-coplanar concurrent forces
25
The weight of a body is due to
Answer: gravitational force of attraction towards the center of the earth
29
Which of the following do not have identical dimensions ?
Answer: Moment of a force and angular momentum.
30
The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to
Answer: the algebraic sum of the resolved parts of the forces in the given direction
31
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
Answer: resolution of forces
32
If two equal forces of magnitude P act at an angle 9°, their resultant will be
Answer: IP cos 9/2
34
If a number of forces act simultaneously on a particle, it is possible
Answer: to replace them by a single force
41
three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
Answer: all the above are correct
42
A single force and a couple acting in the same plane upon a rigid body
Answer: cannot balance each other
43
The maximum frictional force which comes into play when a body just begins to slide over another surface is called
Answer: limiting friction
45
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to
Answer: Wtan(a + )
50
Limiting force of friction is the
Answer: the friction force acting when the body is just about to move
51
If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella
Answer: less inclined when standing
52
A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation
Answer: 6f-8
53
Pick up wrong statement about friction force for dry surfaces. Friction force is
Answer: proportional to velocity of sliding
56
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be
Answer: Gross vehicle mass
57
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be
Answer: upwards at its upper end
58
Which one of the following statements is not correct
Answer: the sine of the angle of repose is equal to coefficient to friction
60
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
Answer: at an angle equal to the angle of friction to the inclined plane
Categories: Engineering
Question and Answers
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