Engineering Mechanics MCQ Questions and Answers

Published: 25 Nov 2025

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

2. The necessary condition for forces to be in equilibrium is that these should be
a) Coplanar
b) Meet at one point
c) Both A and B
d) All be equal

3. 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 isolated body that shows external forces of the body and reaction forces
c) It’s a sketch of a body in motion that shows bending forces of the body
d) It’s a sketch of an undisturbed body that shows external forces of the body

4. Forces are called concurrent when their lines of action meet in
a) One point
b) Two points
c) Plane
d) Perpendicular planes

5. According to law of triangle of forces
a) Three forces acting at a point will be in equilibrium
b) Three forces acting at a point can be represented by a triangle, each side being proportional to force
c) If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle taken in order, they will be in equilibrium
d) None of the above

6. D’Alembert’s principle is used for
a) Determining stresses in the truss
b) Reducing the problem of kinetics to equivalent statics problem
c) Stability of floating bodies
d) Designing safe structures

7. The resultant of two forces P and Q acting at an angle θ is
a) √(P² + Q² + 2PQ sinθ)
b) √(P² + Q² – 2PQ cosθ)
c) √(P² + Q² + 2PQ cosθ)
d) √(P² + Q² – 2PQ tanθ)

8. The law of motion involved in the recoil of gun is
a) Newton’s first law of motion
b) Newton’s second law of motion
c) Newton’s third law of motion
d) None of these

9. 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

10. Which of the following is not the unit of energy?
a) kg m
b) kcal
c) Watt
d) Watt hours