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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A battery of emf 12 V and internal resistance 2 Ω is connected to a variable external resistor. The maximum power that can be delivered to the resistor is:
सही उत्तर: घ) 18 W
Maximum power transfer occurs when R = r = 2 Ω: P = E²/(4r) = 144/8 = 18 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The angle of contact between mercury and clean glass is:
सही उत्तर: घ) obtuse
Mercury does not wet glass (cohesion exceeds adhesion), so its angle of contact is obtuse, about 135°–140°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At the same large distance r from a short electric dipole, the ratio of the electric field on its axial line to that on its equatorial line is:
सही उत्तर: ग) 2 : 1
E_axial = 2kp/r³ and E_equatorial = kp/r³, giving 2 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the radius of a capillary tube is halved, the height to which water rises in it:
सही उत्तर: ग) doubles
h = 2T cos θ/(rρg), so h ∝ 1/r; halving r doubles h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Flow of a liquid through a pipe is streamlined (laminar) when the Reynolds number is:
सही उत्तर: क) low (below about 2000)
Laminar flow occurs for small Reynolds numbers (about < 2000); large values indicate turbulence.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A block floats in water with three-fourths of its volume submerged. Its density is:
सही उत्तर: क) 750 kg/m³
For floating, ρ_body/ρ_water = fraction submerged = 3/4, so ρ = 750 kg/m³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 3 μF capacitor charged to 100 V is connected across an identical uncharged capacitor. The energy lost in the process is:
सही उत्तर: घ) 7.5 mJ
Initial U = ½ × 3 × 10⁻⁶ × 100² = 15 mJ; common voltage 50 V gives final U = ½ × 6 × 10⁻⁶ × 50² = 7.5 mJ, so 7.5 mJ is lost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A monatomic ideal gas (γ = 5/3) is compressed adiabatically to 1/8 of its original volume. Its pressure becomes:
सही उत्तर: ख) 32 times
PV^γ = constant gives P₂/P₁ = 8^(5/3) = 2⁵ = 32.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The elastic potential energy stored per unit volume of a stretched wire is:
सही उत्तर: क) ½ × stress × strain
Energy density = ½ × stress × strain, the area under the linear stress–strain graph.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The isothermal bulk modulus of an ideal gas at pressure P is:
सही उत्तर: क) P
For PV = constant, dP/dV = −P/V, so K = −V dP/dV = P (the adiabatic value is γP).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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