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________________?
(A) density of metal can’t be determined
(B) metal is twice as dense as water
(C) metal will float in water
(D) metal is twice as dense as unknown fluid
(D) none of the above
A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly________________?
(A) 38 m
(B) 62.5 m
(C) 96 m
(D) 124 m
(D) 240 m
The C.G. of a solid hemisphere lies on the central radius 3r_______________?
(A) at distance — from the plane base 3r
(B) at distance — from the plane base 3r
(C) at distance — from the plane base 3r
(D) at distance — from the plane base or
(D) at distance — from the plane base
The C.G. of a right circular solid cone of height h lies at the following distance from the base_____________?
(A) h/2
(B) J/3
(C) h/6
(D) h/4
(D) 3/i/5
Which of the following is the example of lever of first order________________?
(A) arm of man
(B) pair of scissors
(C) pair of clinical tongs
(D) all of the above
(D) none of the above
In actual machines______________?
(A) mechanical advantage is greater than velocity ratio
(B) mechanical advantage is equal to velocity ratio
(C) mechanical advantage is less than velocity ratio
(D) mechanical advantage is unity
(D) none of the above
In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
(A) W between P and F
(B) F between W and P
(C) P between W and F
(D) W, P and F all on one side
(D) none of the above
In ideal machines________________?
(A) mechanical advantage is greater than velocity ratio
(B) mechanical advantage is equal to velocity ratio
(C) mechanical advantage is less than velocity ratio
(D) mechanical advantage is unity
(D) none of the above.
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__________________?
(A) friction
(B) limiting friction
(C) repose
(D) kinematic friction
(D) static friction
A pair of smith’s tongs is an example of the lever of__________________?
(A) zeioth order
(B) first order
(C) second order
(D) third order
(D) fourth order