SECTION-1

# ENGINEERING MECHANICS MCQ

**Q41:- A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act**

(a) Towards the wall at its upper end

(b) Away from the wall at its upper end

(c) Downward at its upper end

(d) Upward at its upper end

**Q42:- A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to**

(a) 25

(b) 50

(c) 100

(d) 250

**Q43:- The range of projectile (R) on an upward inclined plane is**

(a) g. cos² β/2u². sin (α + β). cos α

(b) 2u². sin (α + β). cos α/g. cos² β

(c) g. cos² β/2u². sin (α – β). cos α

(d) 2u². sin (α – β). cos α/g. cos² β

**Q44:- Pick up the incorrect statement from the following:**

(a) The C.G. of a circle is at its centre

(b) The C.G. of a triangle is at the intersection of its medians

(c) The C.G. of a rectangle is at the intersection of its diagonals

(d) The C.G. of a semicircle is at a distance of r/2 from the centre

**Q45:- If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either**

(a) Meet in a point

(b) Be all parallel

(c) At least two of them must meet

##### (d) All the above are correct

**Q46:- Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is**

(a) bh3/4

(b) bh3/8

(c) bh3/12

(d) bh3/36

**Q47:- A particle inside a hollow sphere of radius r, having coefficient of friction μ can rest up to height of**

(a) r/2

(b) r/A

(c) r/3

(d) 0.134 r

**Q48:- On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be**

(a) Towards the wall at its upper end

(b) Away from the wall at its upper end

(c) Upwards at its upper end

(d) Downwards at its upper end

**Q49:- The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is**

(a) [√(4p² – q²)]/6

(b) (4p² – q²)/6

(c) (p² – q²)/4

##### (d) (p² + q²)/4

**Q50:- A force acting on a body may**

(a) Change its motion

(b) Balance the other forces acting on it

(c) Retard its motion

(d) All of the above

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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**