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. The maximum mechanical advantage of a lifting machine is

### 5. In the equation of virtual work, following force is neglected

### 6. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

### 7. When two elastic bodies collide with each other,

### 8. A number of forces acting at a point will be in equilibrium, if

### 9. The moment of inertia of a square of side (a) about an axis through its center of gravity is

### 10. The below 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

### 11. A smooth cylinder lying on its convex surface remains in __________ equilibrium.

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

### 13. During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

### 14. For a self locking machine, the efficiency must be

### 15. According to Newton's first law of motion,

### 16. 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.

### 17. Angle of friction is the

### 18. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

### 19. 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

### 20. Center of percussion is

### 21. Coefficient of friction is the

### 22. The ratio of limiting friction and normal reaction is known as

### 23. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

### 24. Non-coplanar concurrent forces are those forces which

### 25. Coplanar concurrent forces are those forces which

### 26. Non-coplanar non-concurrent forces are those forces which

### 27. A pendulum which executes one beat per second is known as

### 28. D' Alembert's principle is used for

### 29. Centre of gravity of a solid cone lies on the axis at the height

### 30. In the lever of third order, load ‘W’, effort ‘P’ and fulcrum ‘F’ are oriented as follows

### 31. The ideal angle of banking provided on the curves on roads depends upon

### 32. The power developed by a body acted upon by a torque 'T' Newton meter (N - m) and revolving at ω radian/s is given by

### 33. The force induced in the string BC due to the load 'W' as shown in the below figure is

### 34. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate

### 35. If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

### 36. The maximum velocity of a particle moving with simple harmonic motion is

### 37. 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.)

### 38. The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

### 39. If three forces acting in different planes can be represented by a triangle, these will be in

### 40. The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

### 41. 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

### 42. A framed structure is perfect if it contains members equal to (Where, n = number of joints in a frame)

### 43. The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

### 44. A screw jack used for lifting the loads is

### 45. The coefficient of restitution for inelastic bodies is

### 46. Which of the following statement is correct?

### 47. Which of the following is a vector quantity?

### 48. Which of the following is a scalar quantity?

### 49. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to

### 50. The centre of gravity of a uniform lamina lies at

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