# Practice Test: Question Set - 09

1. The forces, whose lines of action are parallel to each other and act in the same directions, are known as
(A) Coplanar concurrent forces
(B) Coplanar non-concurrent forces
(C) Like parallel forces
(D) Unlike parallel forces

2. Two non-collinear parallel equal forces acting in opposite direction
(A) Balance each other
(B) Constitute a moment
(C) Constitute a couple
(D) Constitute a moment of couple

3. If the body falls freely under gravity, then the gravitational acceleration is taken as
(A) +8.9 m/s2
(B) -8.9 m/s2
(C) +9.8 m/s2
(D) -9.8 m/s2

4. 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

5. One joule means that
(A) Work is done by a force of 1 N when it displaces a body through 1 m
(B) Work is done by a force of 1 kg when it displaces a body through 1 m
(C) Work is done by a force of 1 dyne when it displaces a body through 1 cm
(D) Work is done by a force of 1 g when it displaces a body through 1 cm

6. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be
(A) Downwards at its upper end
(B) Upwards at its upper end
(C) Perpendicular to the wall at its upper end
(D) Zero at its upper end

7. Which of the following are vector quantities?
(A) Angular displacement
(B) Angular velocity
(C) Angular acceleration
(D) All of these

8. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
(A) Ellipse
(B) Hyperbola
(C) Parabola
(D) Circle

9. In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively

(A) √3. W (tensile) and 2W (compressive)
(B) 2W (tensile) and √3. W (compressive)
(C) 2√3. W (tensile) and 2√3. W (compressive)
(D) None of the above

10. When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is
(A) mv2
(B) mgv2
(C) 0.5 mv2
(D) 0.5 mgv2

11. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is
(A) Same
(B) Double
(C) Half
(D) Four times

12. The maximum efficiency of a lifting machine is
(A) 1/m
(B) V.R./m
(C) m/V.R.
(D) 1/(m × V.R.)

13. When trying to turn a key into a lock, following is applied
(A) Coplanar force
(B) Non-coplanar forces
(C) Moment
(D) Couple

14. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is
(A) bh3/4
(B) bh3/8
(C) bh3/12
(D) bh3/36

15. If a number of forces act simultaneously on a particle, it is possible
(A) Not a replace them by a single force
(B) To replace them by a single force
(C) To replace them by a single force through C.G.
(D) To replace them by a couple

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