Question

Question 7
Rocket works on the principle of conservation of
(a) mass
(b) energy
(c) momentum
(d) velocity

Answer 1

Since there is no external force on the rocket. The force with which the rocket gives out the fuel, the fuel applies the same force to the rocket(action-reaction pair). Since there is no external force, we can apply conservation of momentum as internal forces(burning of fuel) does not change the momentum of the whole system(rocket + fuel).Hence option C is correct.