Which scientist famously demonstrated that a changing magnetic field induces an electromotive force (EMF), discovering electromagnetic induction? MCQ with Answer and Explanation
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Question #1
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Heat transfer requiring medium and bulk motion is:
Correct Answer: Option D
Explanation:
Convection involves fluid motion carrying heat. Conduction needs medium but no bulk motion; radiation needs no medium. Memory aid: 'Convection = fluid flow + heat transfer; e.g., boiling water, weather'. Definition-based question testing heat transfer modes, frequently examined in competitive exams to distinguish mechanisms.
Convection involves fluid motion carrying heat. Conduction needs medium but no bulk motion; radiation needs no medium. Memory aid: 'Convection = fluid flow + heat transfer; e.g., boiling water, weather'. Definition-based question testing heat transfer modes, frequently examined in competitive exams to distinguish mechanisms.
Question #2
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A bullet of mass 20 g fired from a gun of mass 5 kg with velocity 200 m/s. Recoil velocity of gun is
Question #3
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A 10 μF capacitor is charged to 100 V. Energy stored is
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