81
In actual machines
Answer: mechanical advantage is less than velocity ratio
Questions
83
The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
Answer: repose
84
In the lever of third order, load W, effort P and fulcrum F are oriented as follows
Answer: W between P and F
86
Which of the following is the example of lever of first order
Answer: all of the above
87
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is
Answer: double
88
The C.G. of a right circular solid cone of height h lies at the following distance from the base
Answer: h/4
89
The C.G. of a plane lamina will not be at its geometrical centre in the case of a
Answer: right angled triangle
90
The C.G. of a solid hemisphere lies on the central radius 3r
Answer: at distance — from the plane base or
91
A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
Answer: density of metal can’t be determined
93
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
Answer: hyperbola
94
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
Answer: 50
95
A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
Answer: 62.5 m
96
If n = number of members andy = number of joints, then for a perfect frame, n =
Answer: 2/-3
97
If three forces acting in different planes can be represented by a triangle, these will be in
Answer: non-equilibrium
98
The necessary condition for forces to be in equilibrium is that these should be
Answer: both (a) and (b) above
100
The maximum frictional force which comes into play when a body just begins to slide over another surface is called
Answer: limiting friction
