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

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

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Practice More Physics Questions

Question #1
The layer of atmosphere that reflects radio waves is
A. Mesosphere
B. Ionosphere
C. Stratosphere
D. Troposphere

Correct Answer: Option B


Explanation:
Ionosphere contains ions and free electrons, reflects radio waves back to Earth, enabling long-distance radio communication. Used in skywave propagation. Troposphere weather layer.

This question belongs to: Science Physics
Question #2
The physical quantity having unit henry is
A. Capacitance
B. Conductance
C. Inductance
D. Resistance

Correct Answer: Option C


Explanation:
Henry (H) = V·s/A = Ω·s.

This question belongs to: Science Physics
Question #3
A convex lens forms a real image of an object. If the lower half of the lens is covered, the image will:
A. Be fainter but complete
B. Be half-formed
C. Become virtual
D. Disappear completely

Correct Answer: Option A


Explanation:
Covering part of a lens reduces the amount of light reaching the image, making it fainter, but the entire image is still formed because light from each object point can pass through the uncovered portion and converge to the corresponding image point. Image position, size, and nature remain unchanged. Memory aid: 'Partial lens coverage ⇒ reduced intensity, not partial image'. This conceptual question tests understanding of image formation principles, commonly featured in competitive exams to identify misconceptions about ray optics. Always recall that every point on lens contributes to entire image.

This question belongs to: Science Physics