## ENGINEERING MECHANICS MCQ

SECTION-2

**Q41. Centre of gravity of a thin hollow cone lies on the axis at a height of**

(a) One-fourth of the total height above base

(b) One-third of the total height above base

(c) One-half of the total height above base

(d) Three-eighth of the total height above the base

**Q42. If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.**

(a) Equal to

(b) Less than

(c) Greater than

(d) None of these

**Q43. A pendulum which executes one beat per second is known as**

(a) Simple pendulum

(b) Compound pendulum

(c) Torsional pendulum

(d) Second’s pendulum

**Q44. Which of the following statement is correct in connection with projectiles?**

(a) A path, traced by a projectile in the space, is known as trajectory.

(b) The velocity, with which a projectile is projected, is known as the velocity of projection.

(c) The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

(d) All of the above

**Q45. The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.**

(a) Lie

(b) Do not lie

(c) Either A or B

(d) None of these

**Q46. A single force and a couple acting in the same plane upon a rigid body**

(a) Balance each other

(b) Cannot balance each other

(c) Produce moment of a couple

(d) Are equivalent

**Q47. A force is completely defined when we specify**

(a) Magnitude

(b) Direction

(c) Point of application

(d) All of the above

**Q48. During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.**

(a) Equal to

(b) Equal and opposite to

(c) Less than

(d) Greater than

**Q49. The maximum efficiency of a screw jack is**

(a) (1 – sinθ)/(1 + sinθ)

(b) (1 + sinθ)/(1 – sinθ)

(c) (1 – tanθ)/(1 + tanθ)

(d) (1 + tanθ)/(1 – tanθ)

**Q50. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as**

(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

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**Read More Sections of Engineering Mechanics**

Each section contains maximum 80 Questions. To practice more questions visit other sections.

**Engineering Mechanics Objective Questions – Section-1**

**Engineering Mechanics Objective Questions – Section-2**

**Engineering Mechanics Objective Questions – Section-3**

**Engineering Mechanics Objective Questions – Section-4**

**Engineering Mechanics Objective Questions – Section-5**