**SECTION-3**

## ENGINEERING MECHANICS MCQ

**Q1. Center 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

**Q2. The center 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

**Q3. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve**

##### (a) catenary

##### (b) parabola

##### (c) hyperbola

##### (d) elliptical

**Q4. In the equation of virtual work, following force is neglected**

##### (a) reaction of any smooth surface with which the body is in contact

##### (b) reaction of a rough surface of a body which rolls on it without slipping

##### (c) reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

##### (d) all of the above

**Q5. The coefficient of friction depends on**

##### (a) area of contact

##### (b) shape of surfaces

##### (c) strength of surfaces

##### (d) nature of surface

**Q6. Concurrent forces are those forces whose lines of action**

(a) Lie on the same line

(b) Meet at one point

(c) Meet on the same plane

(d) None of these

**Q7. The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)**

(a) P = mW – C

(b) P = m/W + C

(c) P = mW + C

(d) P = C – mW

**Q8. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)**

(a) IP = IG + Ah^{2}

(b) IP = IG – Ah^{2}

(c) IP = IG / Ah^{2}

(d) IP = Ah2 / IG

**Q9. The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by**

(a) 2P sinθ/2

(b) 2P cosθ/2

(c) 2P tanθ/2

(d) 2P cotθ/2

**Q10. The wheels of a moving car possess**

(a) Potential energy only

(b) Kinetic energy of translation only

(c) Kinetic energy of rotation only

(d) Kinetic energy of translation and rotation both

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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**