Following are some of the multiple choice questions on the **Engineering Mechanics** with answers that will help the students in developing their knowledge.

## Engineering Mechanics MCQ

### 1. Coefficient of friction depends upon

### 2. According to law of triangle of forces

### 3. An ideal machine is one whose efficiency is

### 4. Which of the following is not the unit of power?

### 5. The velocity of a body on reaching the ground from a height h, is

### 6. The maximum mechanical advantage of a lifting machine is

### 7. The velocity ratio for the third system of pulleys is

### 8. The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

### 9. According to Lami’s theorem

### 10. The angle between two forces when the resultant is maximum and minimum respectively are

### 11. Moment of inertia of a circular section about an axis perpendicular to the section is

### 12. 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.

### 13. A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The center of gravity of the section will lie

### 14. Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

### 15. The C.G. of a right circular solid cone of height h lies at the following distance from the base

### 16. If a number of forces are acting at a point, their resultant is given by

### 17. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve

### 18. 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

### 19. The force which acts along the radius of a circle and directed away from the centre of the circle is called centrifugal force.

### 20. Work done is said to be zero, when

### 21. 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.

### 22. When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

### 23. A resultant force is a single force which produces the same effect as produced by all the given forces acting on a body.

### 24. Mass moment of inertia of a uni form thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

### 25. A redundant frame is also called __________ frame.

### 26. The path of the projectile is a parabola.

### 27. 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.

### 28. The centre of gravity of an equilateral triangle with each side a, is __________ from any of the three sides.

### 29. The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.

### 30. 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

### 31. The bodies which rebound after impact are called

### 32. Static friction is always __________ dynamic friction.

### 33. When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.

### 34. The range of a projectile is maximum, when the angle of projection is

### 35. The frequency of oscillation of a torsional pendulum is

### 36. The total time taken by a projectile to reach maximum height and to return back to the ground, is known as time of flight.

### 37. If a number of forces are acting at a point, theirresultant will be inclined at an angle θ with the horizontal, such that

### 38. 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

### 39. The unit of angular acceleration is

### 40. The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

### 41. Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

### 42. If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

### 43. A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.)

### 44. 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.

### 45. The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.

### 46. The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is

### 47. The coefficient of restitution for elastic bodies is one.

### 48. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.

### 49. 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

### 50. The friction experienced by a body, when in motion, is known as

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