A rocket works on the principle of conservation of
A. Angular momentum
B. Momentum
C. Mass
D. Energy
Answer: Option B
Solution (By JKSSB Mock Tests)
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.
Explanation:
Sir C.V. Raman discovered inelastic scattering of light (Raman effect) in 1928, received Nobel in 1930. Used to study molecular structure. Photoelectric effect: Einstein. Electron: J.J. Thomson. Fission: Hahn and Strassmann.
Explanation:
Work done to charge a capacitor is stored as electrostatic potential energy in the electric field between plates: U = ½QV = ½CV² = Q²/(2C). This energy can be recovered when capacitor discharges. Heat (A) is dissipated in resistance during charging, but ideal capacitor stores energy electrostatically. Memory aid: 'Capacitor energy = ½CV², stored in electric field'. This electrostatics concept is frequently tested in competitive exams. Always distinguish ideal capacitor (no resistance) from real circuits where some energy is lost as heat during charging.
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