# 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) a4/4
(B) a4/8
(C) a4/12
(D) a4/36

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

Show and hide multiple DIV using JavaScript View All Answers