Question

The rocket works on the principle of conservation of:
A. Energy
B. Angular momentum
C. Momentum
D. Mass

Answer 1

Hint: Rocket engines release a very high velocity of hot gases which exerts force on the combustion chamber thus propelling the vehicle in forward direction.

Complete step-by-step answer:

As a rocket is having an exhaust which releases high velocity of hot gases from the engine in backward direction which creates the momentum of the gases backwards and therefore by law of conservation of momentum the rocket gets a momentum in the forward direction thus making it move forward.
Hence it is clear that Rocket works on the principle of conservation of momentum therefore the correct option is C.
Basically the momentum of an object is the quantity of motion of a moving body which is given by the product of mass and velocity of the object and it is a vector quantity having both magnitude and direction.
Mathematically it is expressed as \[p = mv\] where $p$ is the momentum, $m$ is the mass and $v$ is the velocity.
Now law of conservation of momentum tells that some parts in an isolated system remaining steady and unchanging over time even when others are moving, for example if a collision is happening between two objects i.e. object first and object second in an isolated system then the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision means that the momentum lost by first object is equal to the momentum gained by the second object this means that the total momentum of a collection of objects in a system is conserved or we can say the total amount of momentum is a constant.

Note: The concept behind the law of conservation of momentum in between the collision of two objects is based on Newton's third law of motion i.e. the forces acting between the two objects are equal in magnitude and in the opposite direction.