# Engineering Mechanics – Section 2

21. The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

A. same at every point on its line of action
B. different at different points on its line of action
C. minimum, if it acts at the center of gravity of the body
D. maximum, if it acts at the center of gravity of the body

Correct Answer: C. minimum, if it acts at the center of gravity of the body

22. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is

A. 5
B. 10
C. 20
D. 40

23. If three forces acting at a point are represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium

A. Yes
B. No

24. Newton’s second law motion __________ a relation between force and mass of a moving body.

A. gives
B. does not give

25. The periodic time of one oscillation for a simple pendulum is(where l = Length of the pendulum.) 26. The resultant of two forces P and Q acting at an angle θ is 27. Which of the following are vector quantities?

A. Linear displacement
B. Linear velocity
C. Linear acceleration
D. all of these

Correct Answer: D. all of these

28. The maximum acceleration of a particle moving with simple harmonic motion is

A. ω
B. ωr
C. ω2r
D. ω/r

29. A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero.

A.True
B.False