A rocket works on the principle of conservation of MCQ with Answer and Explanation

A rocket works on the principle of conservation of
A. Energy
B. Momentum
C. Mass
D. Angular momentum
Answer: Option B
Solution (By JKExamLibrary)
Rocket propulsion: expelled gases backwards impart forward momentum to rocket. Total momentum of rocket + exhaust gases remains conserved. No external force, so momentum conservation applies. Jet engines also work on similar principle.

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error
A metal spoon placed in a hot cup of tea gets hot due to
A. Convection
B. Evaporation
C. Conduction
D. Radiation

Correct Answer: Option C


Explanation:
Heat travels through spoon from hot end to cold end by conduction (molecular vibration and free electrons). Handle gets hot. Metal good conductor.

This question belongs to: Science Physics
Question #2 Report Error
The mass of a proton is about _____ times the mass of an electron.
A. 1836
B. 100
C. 2000
D. 1000

Correct Answer: Option A


Explanation:
Proton mass 1.67×10⁻²⁷, electron 9.11×10⁻³¹, ratio ~1836.

This question belongs to: Science Physics
Question #3 Report Error
If the percentage error in measurement of radius of a sphere is 2%, the percentage error in volume is
A. 4%
B. 8%
C. 2%
D. 6%

Correct Answer: Option D


Explanation:
Volume V = (4/3)πr³, so ΔV/V = 3 Δr/r. Percentage error in volume = 3 × 2% = 6%.

This question belongs to: Science Physics