# 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/s

^{2}

- (B) -8.9 m/s

^{2}

- (C) +9.8 m/s

^{2}

- (D) -9.8 m/s

^{2}

**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 2

*W*(compressive)

- (B) 2

*W*(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)

*mv*

^{2}

- (B)

*mgv*

^{2}

- (C) 0.5

*mv*

^{2}

- (D) 0.5

*mgv*

^{2}

**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)

*bh*

^{3}/4

- (B)

*bh*

^{3}/8

- (C)

*bh*

^{3}/12

- (D)

*bh*

^{3}/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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