# Practice Test: Question Set - 16

**1. Whenever a force acts on a body and the body undergoes a displacement, then**

- (A) Work
is said to be done

- (B) Power
is being transmitted

- (C) Body
has kinetic energy of translation

- (D) None
of these

**2. Which of the following is not the unit of energy?**

- (A) kg m

- (B) kcal

- (C) Watt

- (D) Watt hours

**3. The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (**

*α*) is- (A)

*β*/2

- (B) 30° +

*β*/2

- (C) 45° +

*β*/2

- (D) 60° +

*β*/2

**4. The power developed by a body acted upon by a torque '**

*T'*Newton meter (N - m) and revolving at ω radian/s is given by- (A)

*T*.ω (in watts)

- (B)

*T*.ω/60 (in watts)

- (C)

*T*.ω/75 (in kilowatts)

- (D)

*T*.ω/4500 (in kilowatts)

**5. According to Lami’s theorem**

- (A) The
three forces must be equal

- (B) The
three forces must be at 120° to each other

- (C) The
three forces must be in equilibrium

- (D) If the three
forces acting at a point are in equilibrium, then each force is proportional to
the sine of the angle between the other two

**6. Which of the following is not the unit of work, energy and heat?**

- (A) kcal

- (B) kg-m

- (C) kW-hr

- (D) h.p

**7. If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be**

- (A) Same

- (B) Half

- (C) Double

- (D) None
of these

**8. If a body is acted upon by a number of coplanar non-concurrent forces, it may**

- (A) Rotate
about itself without moving

- (B) Move
in any one direction rotating about itself

- (C) Be
completely at rest

- (D) All of these

**9. The moment of inertia of a square of side (**

*a*) about an axis through its center of gravity is- (A)

*a*

^{4}/4

- (B)

*a*

^{4}/8

- (C)

*a*

^{4}/12

- (D)

*a*

^{4}/36

**10. A projectile is fired at an angle 'θ' to the vertical. Its horizontal range will be maximum when 'θ' is**

- (A) 0°

- (B) 30°

- (C) 45°

- (D) 60°

**11. The time of flight of a projectile on downward inclined plane depends upon**

- (A) Angle
of projection

- (B) Angle
of inclination of the plane

- (C) Both (A) and
(B)

- (D) None of
these

**12. Which of the following is not a scalar quantity?**

- (A) Mass

- (B) Volume

- (C) Density

- (D) Acceleration

**13. The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________**

*√*(*gra/h*)- (A) Less than

- (B) Greater
than

- (C) Equal to

- (D) None
of these

**14. According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then**

- (A) Their
algebraic sum is zero

- (B) Their lines
of action are at equal distances

- (C) The
algebraic sum of their moments about any point in their plane is zero

- (D) The
algebraic sum of their moments about any point is equal to the moment of their
resultant force about the same point

**15. When the spring of a watch is wound, it will possess**

- (A) Strain
energy

- (B) Kinetic
energy

- (C) Heat
energy

- (D) Electrical
energy

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