## ENGINEERING MECHANICS MCQ

**SECTION-3**

**Q61. When two elastic bodies collide with each other**

(a) The two bodies will momentarily come to rest after collision

(b) The two bodies tend to compress and deform at the surface of contact

(c) The two bodies begin to regain their original shape

(d) All of the above

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**Q62. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by**

(a) P + Q

(b) P – Q

(c) P / Q

(d) Q / P

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**Q63. The angular velocity (in rad/s) of a body rotating at N revolutions per minute is**

(a) πN/60

(b) πN/180

(c) 2πN/60

(d) 2πN/180

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**Q64. The coefficient of friction depends upon**

(a) Nature of surfaces

(b) Area of contact

(c) Shape of the surfaces

(d) All of the above

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**Q65. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than**

(a) Two members with unknown forces of the frame

(b) Three members with unknown forces of the frame

(c) Four members with unknown forces of the frame

(d) Three members with known forces of the frame

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**Q66. The algebraic sum of moments of the forces forming couple about any point in their plane is**

(a) Equal to the moment of the couple

(b) Constant

(c) Both of above are correct

(d) Both of above are wrong

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**Q67. A machine having an efficiency greater than 50%, is known as**

(a) Reversible machine

(b) Non-reversible machine

(c) Neither reversible nor non-reversible machine

(d) Ideal machine

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**Q68. Which of the following statement is correct?**

(a) The algebraic sum of the forces, constituting the couple is zero

(b) The algebraic sum of the forces, constituting the couple, about any point is the same

(c) A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense

(d) All of the above

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**Q69. In the lever of third order, load ‘W’, effort ‘P’ and fulcrum ‘F’ are oriented as follows**

(a) W between P and F

(b) F between W and P

(c) P between W and F

(d) W, P and F all on one side

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**Q70. The centre of gravity of a triangle lies at the point of**

(a) Concurrence of the medians

(b) Intersection of its altitudes

(c) Intersection of bisector of angles

(d) Intersection of diagonals

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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**