Work & Energy MCQs with Answers

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The law of conservation of energy is the basis of Bernoulli's theorem, which states that the total mechanical energy in a flowing fluid remains constant.

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A beta particle in a single encounter loses a small fraction of its energy because it undergoes multiple collisions before being completely stopped.

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Highest energy electrons are produced by gamma rays through the photoelectric effect and Compton scattering when high-energy photons interact with matter.

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Nuclear fission is triggered when a heavy nucleus absorbs a neutron, causing it to become unstable and split into smaller nuclei.

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The solar constant is approximately 1.4 kW/m², representing the amount of solar energy received per unit area at Earth's mean distance from the Sun.

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Maximum amount of energy is utilized in Swimming because it involves full-body muscle engagement and water resistance increases energy expenditure.

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In nuclear fusion, atoms are combined and energy is released.

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The binding energy per nucleon is maximum for intermediate nuclei (such as iron-56), making them the most stable.

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The stopping potential in the photoelectric effect is proportional to the energy of the most energetic electron after it is ejected, which equals the maximum kinetic energy of the photoelectron.

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After 80 days (which is 4 half-lives of 20 days each), the remaining amount is 40 ÷ 2⁴ = 2.5gm.