The phenomenon of resonance in sound is used in: MCQ with Answer and Explanation
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Question #1
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The boiling point of water at high altitude is lower because
Correct Answer: Option B
Explanation:
Boiling occurs when vapour pressure equals atmospheric pressure. At high altitude, atmospheric pressure is lower, so water boils at lower temperature. Pressure cooker increases pressure to raise boiling point for faster cooking.
Boiling occurs when vapour pressure equals atmospheric pressure. At high altitude, atmospheric pressure is lower, so water boils at lower temperature. Pressure cooker increases pressure to raise boiling point for faster cooking.
Question #2
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The velocity of a body changes from 2 m/s to 10 m/s in 4 s. Distance covered in this time is (assuming constant acceleration)
Question #3
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The internal energy of an ideal gas depends only on:
Correct Answer: Option A
Explanation:
For an ideal gas, internal energy U depends solely on temperature (U = f/2 nRT, where f is degrees of freedom). This follows from kinetic theory: no intermolecular forces, so energy is purely kinetic, proportional to T. Pressure and volume can change at constant T (isothermal process) without changing U. Memory tip: 'Ideal gas: U = U(T) only; real gases have volume dependence'. This thermodynamics concept is frequently tested in competitive exams. Always distinguish ideal vs real gas behavior; competitive exams typically assume ideal gas unless specified.
For an ideal gas, internal energy U depends solely on temperature (U = f/2 nRT, where f is degrees of freedom). This follows from kinetic theory: no intermolecular forces, so energy is purely kinetic, proportional to T. Pressure and volume can change at constant T (isothermal process) without changing U. Memory tip: 'Ideal gas: U = U(T) only; real gases have volume dependence'. This thermodynamics concept is frequently tested in competitive exams. Always distinguish ideal vs real gas behavior; competitive exams typically assume ideal gas unless specified.
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