(A) 20 J
(B) 30 J
(C) 40 J
(D) 60 J
Tag: Physics Mcq
If angle between force and displacement is less than 90 degree then work done is:
(A) Positive
(B) Negative
(C) Zero
(D) Virtual
Two masses of 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitude of their linear momenta is:
(A) 4 : 1
(B) √2 : 1
(C) 1 : 2
(D) 1 : 16
A bullet is fired from a riffle. If the riffle recoils freely, then the kinetic energy of the rifle will be:
(A) same as that of bullet
(B) more than that of bullet
(C) less than that of bullet
(D) none of these
A body is dropped from a height of 20 m and rebounds to a height of 10 m. The loss of energy is:
(A) 10%
(B) 45%
(C) 50%
(D) 75%
An engine pumps up 100 kg of water through a height of 10 m in 5s. Given that efficiency of engine is 60%. If g=10ms-2 , the power of this engine is:
(A) 3.3KW
(B) 0.033KW
(C) 0.20KW
(D) 33KW
A light body A and a heavy body B have equal kinetic energies of translation. Then:
(A) A has larger momentum than B
(B) B has larger momentum than A
(C) A and B have same momentum
(D) nothing can be said about their momentum relationship unless actual masses are known
A moving body need not have:
(A) kinetic energy
(B) Potential energy
(C) momentum
(D) velocity