A current of 0.5 A flows through a 100 Ω resistor. Voltage across it is MCQ with Answer and Explanation
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Question #1
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The de Broglie wavelength associated with a moving particle is inversely proportional to its:
Correct Answer: Option C
Explanation:
Louis de Broglie proposed that matter exhibits wave-like properties. The de Broglie wavelength (lambda) of a particle is given by the formula lambda = h / p, where 'h' is Planck's constant and 'p' is the linear momentum (mass * velocity) of the particle. Therefore, the wavelength is strictly inversely proportional to the momentum of the moving particle.
Louis de Broglie proposed that matter exhibits wave-like properties. The de Broglie wavelength (lambda) of a particle is given by the formula lambda = h / p, where 'h' is Planck's constant and 'p' is the linear momentum (mass * velocity) of the particle. Therefore, the wavelength is strictly inversely proportional to the momentum of the moving particle.
Question #2
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Heat transfer by fluid motion is:
Correct Answer: Option A
Explanation:
Convection: bulk fluid motion carries heat (natural: density-driven; forced: pump/fan). Conduction: molecular collisions; radiation: EM waves. Memory aid: 'Convection = fluid flow + heat; e.g., boiling, weather'. Heat transfer mode frequently tested in competitive exams.
Convection: bulk fluid motion carries heat (natural: density-driven; forced: pump/fan). Conduction: molecular collisions; radiation: EM waves. Memory aid: 'Convection = fluid flow + heat; e.g., boiling, weather'. Heat transfer mode frequently tested in competitive exams.
Question #3
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Spring-mass period in orbiting satellite:
Correct Answer: Option C
Explanation:
T = 2π√(m/k): depends on mass and spring constant only, not gravity. Weightlessness doesn't affect spring force. Memory aid: 'Spring period: independent of g; pendulum period: depends on g'. Oscillations concept frequently tested in competitive exams.
T = 2π√(m/k): depends on mass and spring constant only, not gravity. Weightlessness doesn't affect spring force. Memory aid: 'Spring period: independent of g; pendulum period: depends on g'. Oscillations concept frequently tested in competitive exams.
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