A spring of spring constant k is stretched by x. The potential energy stored is MCQ with Answer and Explanation
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Question #1
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The phenomenon of interference of light demonstrates that light has:
Correct Answer: Option B
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.
Question #2
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The quantity of heat required to convert 1 kg of water at 100°C to steam at 100°C is called:
Correct Answer: Option C
Explanation:
Latent heat of vaporization is the heat required to change unit mass from liquid to vapor at constant temperature (boiling point). For water, it's approximately 2260 kJ/kg. Latent heat of fusion applies to solid-liquid transition. Specific heat relates to temperature change without phase change. Thermal conductivity measures heat transfer rate through conduction. Memory aid: 'Vaporization = liquid to gas; fusion = solid to liquid'. This definition-based question tests precise terminology, crucial for thermodynamics sections in competitive exams where distractors often mix phase change terms.
Latent heat of vaporization is the heat required to change unit mass from liquid to vapor at constant temperature (boiling point). For water, it's approximately 2260 kJ/kg. Latent heat of fusion applies to solid-liquid transition. Specific heat relates to temperature change without phase change. Thermal conductivity measures heat transfer rate through conduction. Memory aid: 'Vaporization = liquid to gas; fusion = solid to liquid'. This definition-based question tests precise terminology, crucial for thermodynamics sections in competitive exams where distractors often mix phase change terms.
Question #3
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The heating element of an electric heater is made of nichrome because it has
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