Latent heat of fusion ice = 336 kJ/kg. Heat to melt 3 kg ice at 0°C: MCQ with Answer and Explanation
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Question #1
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The substance used as moderator in nuclear reactor must
Question #2
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According to Newton's third law, action and reaction forces:
Correct Answer: Option A
Explanation:
Newton's third law states: for every action, there is an equal and opposite reaction. These forces act on two different interacting bodies, hence they never cancel each other as they don't act on the same body. They can act at a distance (e.g., gravitational forces) or through contact. Cancellation of forces occurs only when multiple forces act on a single body. This distinction is crucial for free-body diagram analysis. Exam tip: Always identify which body each force acts upon. Misconception about force cancellation is a common trap in competitive exam questions testing Newton's laws.
Newton's third law states: for every action, there is an equal and opposite reaction. These forces act on two different interacting bodies, hence they never cancel each other as they don't act on the same body. They can act at a distance (e.g., gravitational forces) or through contact. Cancellation of forces occurs only when multiple forces act on a single body. This distinction is crucial for free-body diagram analysis. Exam tip: Always identify which body each force acts upon. Misconception about force cancellation is a common trap in competitive exam questions testing Newton's laws.
Question #3
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The phenomenon of interference of light demonstrates that light has:
Correct Answer: Option C
Explanation:
Interference (constructive/destructive superposition) is a characteristic wave phenomenon, requiring coherent sources and path difference. Young's double-slit experiment demonstrated light interference, confirming its wave nature. Particle nature is shown by photoelectric effect. Memory aid: 'Interference/diffraction ⇒ wave nature; photoelectric effect ⇒ particle nature'. This conceptual question tests wave-particle duality fundamentals, frequently examined in competitive exams. Always link specific phenomena to the aspect of light they demonstrate; competitive exams often combine both aspects in advanced questions.
Interference (constructive/destructive superposition) is a characteristic wave phenomenon, requiring coherent sources and path difference. Young's double-slit experiment demonstrated light interference, confirming its wave nature. Particle nature is shown by photoelectric effect. Memory aid: 'Interference/diffraction ⇒ wave nature; photoelectric effect ⇒ particle nature'. This conceptual question tests wave-particle duality fundamentals, frequently examined in competitive exams. Always link specific phenomena to the aspect of light they demonstrate; competitive exams often combine both aspects in advanced questions.
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