इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ प्रवेश: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Transverse mechanical waves can travel:
सही उत्तर: ग) in solids and along the surface of liquids, but not through gases
Transverse waves need a restoring force against shear; gases have none, while solids and liquid surfaces (via surface tension and gravity) can support them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A source of sound moves directly away from a stationary observer at a speed equal to the speed of sound. The apparent frequency is:
सही उत्तर: घ) half the actual frequency
f′ = f v/(v + v_s) = f v/(2v) = f/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A burn from steam at 100 °C is more severe than one from water at 100 °C because steam:
सही उत्तर: क) gives out its latent heat of vaporisation on condensing
Each gram of condensing steam releases about 540 cal of latent heat before it starts cooling as water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Carnot cycle consists of:
सही उत्तर: क) two isothermal and two adiabatic processes
The Carnot cycle: isothermal expansion, adiabatic expansion, isothermal compression, adiabatic compression.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Clausius statement of the second law of thermodynamics states that:
सही उत्तर: ख) heat cannot by itself flow from a colder body to a hotter body
Clausius: no process is possible whose sole result is the transfer of heat from a colder to a hotter body.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a vacuum flask (thermos), the silvering of the inner walls mainly reduces heat transfer by:
सही उत्तर: ग) radiation
Silvered surfaces are poor emitters and good reflectors of radiation; the vacuum stops conduction and convection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coefficient of volume expansion of an ideal gas at constant pressure and absolute temperature T is:
सही उत्तर: घ) 1/T
V = nRT/P, so (1/V)(dV/dT) = 1/T.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molar specific heat of an ideal gas in an isothermal process is:
सही उत्तर: घ) infinite
Heat is added but ΔT = 0, so C = Q/(nΔT) is infinite.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The surface tension of a liquid is numerically equal to its:
सही उत्तर: क) surface energy per unit area
The work done to increase the surface area by unit amount (isothermally) equals the surface tension.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The upward lift on an aeroplane wing is mainly explained by:
सही उत्तर: ख) Bernoulli's principle
Air flows faster over the curved upper surface, so pressure there is lower than below (Bernoulli), producing lift.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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