Engineering Mechanics Objective Type Questions - Set 04

Practice Test: Question Set - 04

1. 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

2. 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

3. 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

4. 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

5. In order to double the period of simple pendulum, the length of the string should be
    (A) Halved
    (B) Doubled
    (C) Quadrupled
    (D) None of these

6. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
    (A) Friction
    (B) Limiting friction
    (C) Repose
    (D) Kinematic friction

7. The energy possessed by a body, for doing work by virtue of its position, is called
    (A) Potential energy
    (B) Kinetic energy
    (C) Electrical energy
    (D) Chemical energy

8. The centre of gravity of a uniform lamina lies at
    (A) The centre of heavy portion
    (B) The bottom surface
    (C) The midpoint of its axis
    (D) All of the above

9. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as
    (A) Coplanar concurrent forces
    (B) Coplanar non-concurrent forces
    (C) Like parallel forces
    (D) Unlike parallel forces

10. Angle of friction is the
    (A) Angle between normal reaction and the resultant of normal reaction and the limiting friction
    (B) Ratio of limiting friction and normal reaction
    (C) The ratio of minimum friction force to the friction force acting when the body is just about to move
    (D) The ratio of minimum friction force to friction force acting when the body is in motion

11. Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is ________ than that about X-X axis.
Engineering Mechanics question no. 11, set 04

    (A) Two times
    (B) Same
    (C) Half
    (D) None of these

12. The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)
    (A) 2π. √(gh/kG² + h²)
    (B) 2π. √(kG² + h²/gh)
    (C) 1/2π. √(gh/kG² + h²)
    (D) 1/2π. √(kG² + h²/gh)

13. The necessary condition for forces to be in equilibrium is that these should be
    (A) Coplanar
    (B) Meet at one point
    (C) Both (A) and (B) above
    (D) All be equal

14. Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is
    (A) 20 N
    (B) 40 N
    (C) 120 N
    (D) None of these

15. In actual machines
    (A) Mechanical advantage is greater than velocity ratio
    (B) Mechanical advantage is equal to velocity ratio
    (C) Mechanical advantage is less than velocity ratio
    (D) Mechanical advantage is unity

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