भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – इन्जिनियरिङ प्रवेश
Physics · Engineering Entrance – Mathematics, Physics, Chemistry & English · १,३९८ प्रश्न
१,३९८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान (Physics): 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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The number of degrees of freedom of a monatomic gas molecule is:
सही उत्तर: ग) 3
A monatomic molecule has only three translational degrees of freedom (motion along x, y and z).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an isochoric (constant-volume) process, the heat supplied to an ideal gas:
सही उत्तर: क) all goes into increasing its internal energy
With ΔV = 0 the work done W = PΔV = 0, so by the first law ΔQ = ΔU.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molar specific heat of a gas in an adiabatic process is:
सही उत्तर: ग) zero
In an adiabatic process no heat is exchanged (ΔQ = 0) even though the temperature changes, so C = ΔQ/(nΔT) = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bucket of water stands in a lift accelerating upward at 2 m/s². The pressure due to the water at a depth of 0.5 m is (ρ = 1000 kg/m³, g = 10 m/s²):
सही उत्तर: क) 6000 Pa
In the lift the effective gravity is g + a = 12 m/s², so p = ρ(g + a)h = 1000 × 12 × 0.5 = 6000 Pa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equation of continuity (A₁v₁ = A₂v₂) for an incompressible fluid is a consequence of the conservation of:
सही उत्तर: घ) mass
The mass of fluid entering a section per second must equal the mass leaving it; for constant density this gives Av = constant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a U-tube containing water, oil is poured into one arm. A 10 cm column of oil balances an 8 cm column of water (measured from the interface level). The density of the oil is:
सही उत्तर: ख) 800 kg/m³
Equal pressures at the interface level: ρ_oil × 10 = 1000 × 8, so ρ_oil = 800 kg/m³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The adiabatic bulk modulus of an ideal gas at pressure P (ratio of specific heats γ) is:
सही उत्तर: ख) γP
From PVᵞ = constant, dP/dV = −γP/V, so B = −V dP/dV = γP.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Young's modulus of a wire depends on:
सही उत्तर: ग) the material of the wire only
Young's modulus is a property of the material (at a given temperature); changing length, area or load changes stress and strain in the same ratio.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When an additional 2 kg mass is attached to a mass hanging from a spring, the period of oscillation doubles. The original mass was:
सही उत्तर: क) 2/3 kg
T ∝ √m, so (m + 2)/m = 4, giving 3m = 2 and m = 2/3 kg.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For SHM x = A sin(2πt/T), the displacement at t = T/8 is:
सही उत्तर: घ) A/√2
x = A sin(2π/8) = A sin 45° = A/√2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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