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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In an isothermal process for an ideal gas, the change in internal energy is:
सही उत्तर: ख) Zero
Internal energy of an ideal gas depends only on temperature; since T is constant, ΔU = 0 and all heat supplied becomes work.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which mode of heat transfer can take place through vacuum?
सही उत्तर: क) Radiation
Radiation travels as electromagnetic waves and needs no medium, which is how the Sun's heat reaches Earth. Conduction and convection require a material medium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Newton's law of cooling, the rate of cooling of a body is proportional to:
सही उत्तर: घ) The temperature difference between the body and its surroundings
Newton's law of cooling: dT/dt ∝ (T − T₀), valid for small temperature differences. The T⁴ dependence is Stefan's law for total radiation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As the temperature of a black body increases, the wavelength at which it emits maximum radiation:
सही उत्तर: ग) Decreases
By Wien's displacement law λₘT = constant, so λₘ decreases as T rises. This is why a heated iron turns from red to white.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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While ice is melting at its melting point under normal pressure, its temperature:
सही उत्तर: ख) Remains constant
The heat supplied is used as latent heat to break the solid structure, so temperature stays at 0 °C until all ice melts.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an isotropic solid, the coefficient of volume expansion γ and linear expansion α are related by:
सही उत्तर: क) γ = 3α
For small expansions α : β : γ = 1 : 2 : 3, so γ = 3α. β = 2α is the areal (superficial) expansion coefficient.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A temperature of 300 K corresponds to:
सही उत्तर: घ) 27 °C
T(°C) = T(K) − 273 = 300 − 273 = 27 °C. 573 results from adding 273 instead of subtracting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Surface tension of a liquid generally ______ with increase in temperature.
सही उत्तर: ग) Decreases
Higher temperature weakens intermolecular cohesive forces, so surface tension decreases and becomes zero at the critical temperature. That is why hot water cleans better.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The gauge pressure (excess over atmospheric) at a depth of 10 m in water is (ρ = 1000 kg/m³, g = 10 m/s²):
सही उत्तर: ख) 1 × 10⁵ Pa
P = ρgh = 1000 × 10 × 10 = 1 × 10⁵ Pa, roughly equal to one atmosphere. So every 10 m of water adds about 1 atm of pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water flows through a pipe whose cross-section reduces from 4 cm² to 1 cm². If the speed in the wider part is 2 m/s, the speed in the narrower part is:
सही उत्तर: क) 8 m/s
Equation of continuity: A₁v₁ = A₂v₂, so v₂ = 4 × 2 / 1 = 8 m/s. 0.5 m/s results from inverting the area ratio.
💬 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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