# Engineering Mechanics MCQ (Multiple Choice Questions)

1. What is Engineering Mechanics?
a) Study of bodies under motion without considering forces
b) Application of mechanics to issues involving common engineering aspects
c) Study of bodies only under rest
d) Study of bodies only under motion

Explanation: The application of mechanics to issues involving common engineering aspects is known as engineering mechanics. The purpose of the Engineering Mechanics course is to expose students to mechanics problems as they are applied to realistic circumstances.

2. What is Mechanics?
a) Branch of science which deals with failure analysis
b) Branch of science which deals with conditions of rest or motion of bodies
c) Branch of science which deals with the study of bodies only under rest
d) Branch of science which deals with the study of bodies only under motion

Explanation: The branch of physics that deals with how the action of force affects material bodies or the functional aspects of activity are known as mechanics. The distance takes an automobile traveling at 30 mph to come to a complete stop is an illustration of mechanics.

3. Which of the following is a branch of mechanics?
a) Statics and kinetics
b) Statics and dynamics
c) Kinematics and dynamics
d) Kinetics and kinematics

Explanation: There are two branches of mechanics they are statics and dynamics. Statics deals with the study of bodies at rest. Dynamics deals with the study of bodies under motion.

4. Which of the following is the basic law for mechanics?
a) Newton’s law of viscosity
b) Parallelogram law
c) Newton’s laws of motion
d) Hooke’s law

Explanation: The fundamental law for engineering mechanics is Newton’s laws of motion. Newton’s first law, second law, and third law are widely used to solve issues involving mechanical aspects.

5. Which of the following is termed as an action of pull or push of a body at rest or motion?
a) Torque
b) Momentum
c) Work
d) Force

Explanation: The pull or push of a body at rest or motion is termed as a force. When an external agent acts on a body, it moves. This external agent is force.

6. What is Kinematics?
a) Branch of dynamics which deals with the study of bodies under motion without considering forces
b) Branch of dynamics which deals with the study of bodies at rest
c) Branch of dynamics which deals with the study of bodies under motion by considering forces
d) Branch of dynamics which deals with the study of bodies under the motion

Explanation: Kinematics is a discipline of physics and a subdivision of classical mechanics that deals with the geometrically conceivable motion of a body or system of bodies without taking the forces into account.

7. Which of the following is the condition for the three-force theorem in mechanics?
a) The force system should be in equilibrium only
b) The force systems should be non-coplanar
c) The system should be co-planar, parallel
d) The force system should be in equilibrium, co-planar, concurrent, or parallel

Explanation: The three force theorem states that when three forces occur on a body, the force systems are in equilibrium, coplanar, and either concurrent or parallel.

8. Which of the following is the SI unit of force?
a) Kg m
b) Kg m2
c) Kg m2/s
d) Kg m/s2

Explanation: Force is the action of pull or push of a body. The unit of force is Newton in SI units. 1N = Kg m/s2, force is the product of mass and acceleration.

9. According to which of the following laws of mechanics a body remains/continue in its state of rest or motion until it is disturbed by an external agent?
a) Newton’s first law of motion
b) Newton’s second law of motion
c) Newton’s third law of motion
d) Superposition law

Explanation: Newton’s first law asserts that if a body is at rest or moving in a straight path at a constant speed, it will remain at rest or continue to move in a straight line at a constant speed until acted upon by a force.

10. Which of the following is the characteristic of force?
a) Magnitude of force
b) Point of application of force
c) Direction of application of force
d) All of the mentioned

Explanation: Three important quantities that define force are:
i) The magnitude of the force
ii) The direction of application of force
iii) Point of application of force

11. When can two forces be in equilibrium?
a) They are equal in magnitude
b) They are collinear
c) They are opposite in direction
d) All of the mentioned

Explanation: Two forces are said to be in equilibrium only if the forces are equal in magnitude, opposite in direction, and are collinear. This is equilibrium law.

12. Which of the following statements describes the resultant of two forces?
a) Force that maintains the system in equilibrium
b) Force that has the highest magnitude in the system
c) Force that has the same effect as the two forces
d) Force that has the same effect as one force

Explanation: When two forces act on a body, the resultant of those two forces is taken into account. The effect of the resulting force is the same as the effect of the two forces. The force that has the same impact as the two forces is known as the resultant of two forces.

13. The point of application where the total weight can be expected to be concentrated if the gravitational force is dispersed across the volume of the body is called ______
a) The surface of the body
b) The centroid of the body
c) Center of gravity of the body
d) Moment of inertia

Explanation: The centre of gravity of the body is the point of application where the complete weight of the body is thought to be concentrated.

14. What is a free-body diagram?
a) It’s a sketch of a moving body that shows internal forces of the body and reaction forces
b) It’s a sketch of an undisturbed body that shows external forces of the body
c) It’s a sketch of an isolated body that shows external forces of the body and reaction forces
d) It’s a sketch of a body in motion that shows bending forces of the body

Explanation: A free-body diagram is a drawing of an isolated body that depicts external forces operating on it as well as reaction forces imposed by removing parts.

15. The internal force in structures among the following is?
a) Gravity force
b) Compression force
c) Impact force
d) Bending force

Explanation: Internal forces are forces that act between elements of a structure. The internal force is the compression force. Compression is the force that squeezes the particles of an item together.

16. Which of the following is a feature of friction?
a) Always acts in the direction opposite to the applied force
c) Always acts in the direction of applied force
d) It is an active force

Explanation: A resistive force is created when one body slides over another. Frictional force is the name for this opposing force. It works in the opposite direction of the applied force.

17. When there is no relative force between touching surfaces, which of the following force is developed?
a) Dry friction
b) Dynamic friction
c) Fluid friction
d) Static friction

Explanation: The frictional force that emerges when there is no relative motion between the contacting surfaces is known as static friction.

18. When the surfaces of two bodies come in contact, there is a limited amount of resistance to sliding between them, which is known as _________
a) Lubrication
b) Friction
c) Internal forces
d) Attraction force

Explanation: Frictional force is the resistive force that is created when the surfaces of two bodies come into contact. Various lubrication strategies are used to reduce friction.

19. Which of the following doesn’t affect frictional force?
a) Surface roughness
b) Reaction of surface
c) Area of contact
d) Force tending cause motion

Explanation: Friction is a resistive force that acts on a body regardless of the size of the contact area between the surfaces.

20. Which of the following is valid if two forces are represented by two sides of a triangle in order?
a) The resultant of two forces is represented by the third side in the same sequence
b) The resultant of two forces is represented by the third side in reverse order
c) The resultant’s magnitude is zero
d) The resultant’s magnitude is greatest

Explanation: If two forces act concurrently on a particle and are represented by two sides of a triangle taken in order, the resultant is represented by the third side taken in reverse order, according to the Triangle Law of Forces.

21. What is the relationship between each force, if three concurrent forces acting on a body according to Lami’s theorem?
a) Directly proportional to the sine of the angle between the other two forces
b) Inversely proportional to the cosine of the angle between the other two forces
c) Directly proportional to the cosine of the angle between the other two forces
d) Inversely proportional to the sine of the angle between the other two forces

Explanation: If three concurrent forces act on a body, each force is proportional to the sine of the angle between the other forces, according to Lami’s theorem.

22. Which of the following is a vector quantity?
a) Density
b) Mass
c) Volume
d) Acceleration

Explanation: The only thing that determines a scalar quantity is its magnitude. Vector quantities are those that are affected by both magnitude and direction. The magnitude and direction of acceleration are both defined.

23. What is the the effect of a force upon a body according to the principle of transmissibility of forces?
a) Different at various locations along its line of action
b) Minimum when acting at the body’s centre of gravity
c) Maximum when acting at the body’s centre of gravity
d) The same at all points along its line of action

Explanation: The point of application of a force can be conveyed along its line of action without modifying the force’s impact on the rigid body to which it is applied, according to the theorem of transmissibility of a force. Every point along its path of action is the same.

24. The moment of the resultant of two concurrent forces to a center in their plane is equal to
a) The algebraic sum of the moments of the components to the same centre
b) The algebraic sum of the moments of the components to a different centre
c) The difference in component moments with respect to a different centre
d) The difference between the components moments at the same centre

Explanation: The moment of the resultant of two concurrent forces to a location in their plane is equal to the algebraic sum of the moments of the components to the same centre, according to the varignon theorem in mechanics.

25. Which of the following conditions doesn’t affect the magnitude of the moment?
a) If the point of application of force is opposing the line of action
b) If the point of application of force is along the line of action
c) If the moment of centre is shifted along a line perpendicular to the line of action
d) If the resultant is maximal

Explanation: If the point of application of force is transported along the line of action and the moment of the centre is moved down a line parallel to the line of action of force, the magnitude of the moment remains unchanged. The magnitude is unaffected in either instance.

26. Which of the following forces do not cause the rotation?
a) Non-Parallel
b) Non-concurrent
c) Parallel
d) Concurrent

Explanation: The concurrent forces are those that are in contact with the rotation axis in some way. If any of the forces are in contact with that axis, they are either ignored or inadequate to create a rotation. When a force is contemporaneous, its perpendicular distance from an axis line is 0, implying that there is no rotation. An instant, as we all know, causes rotation.

27. The moment is the cross product of which of the following two vectors/scalars?

Explanation: The cross-product must be created in the correct order. If no action is taken, the result is the polar opposite of the genuine result. As a result, the answer is the Radius and Force vectors, not the Force and Radius vectors. Because the moment, like many of the cross products, has a sense of direction, vigilance is required.

28. Which part of the truss section is made to employ the method of joints in the free body diagram?
a) Combination of joint and the whole structure
b) The whole structure
c) Truss
d) Joints

Explanation: The method of joints is used in the free body diagram of joints part of the truss section. To perform the calculations, many equilibrium equations are used. In the vertical direction, the net force is set to zero. Forces in the horizontal direction are also made to be zero.

29. Which element of the truss section is made to apply the method of sections in the free body diagram?
a) The whole structure
b) Any section can be used
c) Joints
d) Truss

Explanation: The method of sections is used to create a free body diagram of any element of the truss section. To perform the calculations, many equilibrium equations are used. In the vertical direction, the net force is set to zero. In addition, horizontal direction forces have been set to zero.

30. Which of the following contains moving parts?
a) Beam
b) Frames
c) Machines
d) Truss

Explanation: The machines are constructed in such a way that the moving parts are contained. Machines are built to have moving parts since they are used in a variety of fields. They’re also made in such a way that the working bits within aren’t damaged.

31. The change in the moment is equal to which of the following?
a) Rotational moment
b) Bending moment
c) Total weight
d) Area under the shear diagram

Explanation: After the application of the force equation of equilibrium to the segment of the beam, we have the above result. This is done on the very small part of the beam. That is the minimal section of the beam is to be considered and then the application of the equilibrium equations is done so as to calculate the final result.

32. Over a block of weight W, the theory of friction is described. Which of the following describes the surface on which of the following block is located?
a) Coloured red
b) Having density in negative
c) The motion of that block is always horizontal
d) Non-rigid

Explanation: A deformable surface is a block used to teach the theory of friction. Dry friction occurs when there is no lubricating fluid present between the surfaces in contact, according to the theory of friction. As a result, to demonstrate that the same tests can be performed on a non-rigid/deformable surface.

33. Which of the following type of screws is used in the machines?

Explanation: In the machines, square threaded screws are employed. Because screws are commonly employed as fasteners. The fundamental benefit of screws is that the friction aids in the structure’s retention. Screws also aid in the fast and efficient joining of the structure.

34. In the free body diagrams, the normal forces acting on the belt are in which of the following direction for calculating the equilibrium equations?
a) Horizontally Left
b) Horizontally Right
c) Vertically Upward
d) Vertically Downward

Explanation: Because the loads are acting in a downward direction. The normal forces act in a vertically upward fashion to balance the forces. Dry friction occurs when there is no lubricating fluid present between the surfaces in contact, as we all know. The magnitude of friction is subtracted from the normal forces.

35. In the journal bearings calculations, the moment is the cross product of which of the following two vectors?

Explanation: The cross-product must be created in the correct order. If no action is taken, the result is the polar opposite of the genuine result. As a result, the answer is the Radius and Force vectors, not the Force and Radius vectors. Because the moment, like many of the cross products, has a sense of direction, vigilance is required.

## Chapterwise Multiple Choice Questions on Engineering Mechanics

Our 1000+ MCQs focus on all topics of the Engineering Mechanics subject, covering 100+ topics. This will help you to prepare for exams, contests, online tests, quizzes, viva-voce, interviews, and certifications. You can practice these MCQs chapter by chapter starting from the 1st chapter or you can jump to any chapter of your choice.

## 1. Engineering Mechanics MCQ on Force Vectors

The section contains engineering mechanics multiple choice questions and answers on coplanar forces, cartesian vectors, dot and cross product.

## 2. Engineering Mechanics Multiple Choice Questions on Equilibrium of a Particle

The section contains engineering mechanics questions and answers on three dimensional force system.

## 3. Engineering Mechanics MCQ on Force System Resultants

The section contains engineering mechanics MCQs on moment of a force and couple, moment of a force on simplified axis, simple distributed loading, force and couple system simplification.

## 4. Engineering Mechanics Multiple Choice Questions on Equilibrium of a Rigid Body

The section contains engineering mechanics multiple choice questions and answers on rigid body equilibrium conditions, two and three force members, free body diagrams, constraints and statical determinacy.

## 5. Engineering Mechanics MCQ on Structural Analysis

The section contains engineering mechanics questions and answers on simple trusses, joints method, zero force member, sections method, space trusses, frame and machines.

## 6. Engineering Mechanics Multiple Choice Questions on Internal Forces

The section contains engineering mechanics MCQs on internal forces developed in structural members, shear and moment diagrams, cables, bending moment and shear stress diagram, cables subjected to a distributed load and its own weight.

## 7. Engineering Mechanics MCQ on Friction

The section contains engineering mechanics multiple choice questions and answers on dry friction characteristics and problems, wedges, frictional forces on screws, flat belts, pivot bearings and disks, journal bearings and rolling resistance.

## 8. Engineering Mechanics Multiple Choice Questions on Centre of Gravity and Centroid

The section contains engineering mechanics questions and answers on centre of gravity and mass, centroid of a body, composite bodies, pappus and guldinus theorem, general distributed loading and fluid pressure.

## 9. Engineering Mechanics MCQ on Moments of Inertia

The section contains engineering mechanics MCQs on moment and product of an inertia for an area, moment of inertia for inclined axis, radius gyration of area, mohrs circle and mass moment of inertia.

## 10. Engineering Mechanics Multiple Choice Questions on Principle of Virtual Work

The section contains engineering mechanics multiple choice questions and answers on work, conservative forces, potential energy, equilibrium potential energy criterion and stability configurations.

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