21. In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.
A. Agree
B. Disagree
22. An irregular body may have more than one centre of gravity.
A. Yes
B. No
23. The rate of doing work is known as
A. potential energy
B. kinetic energy
C. power
D. none of these
24. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.
A. True
B. False
25. Moment of inertia of a circular section about its diameter (d) is
A. πd3/16
B. πd3/32
C. πd4/32
D. πd4/64
26. The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.
A. True
B. False
27. In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.
A. less than
B. equal to
C. more than
28. The unit of work in S.I. units is
A. Newton
B. Erg
C. kg-m
D. Joule
29. The static friction
A. bears a constant ratio to the normal reaction between the two surfaces
B. is independent of the area of contact, between the two surfaces
C. always acts in a direction, opposite to that in which the body tends to move
D. all of the above
30. The maximum height of a projectile on a horizontal plane is
