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 root mean square speed of nitrogen molecules (M = 28 g/mol) at 27 °C is about (R = 8.314 J mol⁻¹ K⁻¹):
सही उत्तर: घ) 517 m/s
v_rms = √(3RT/M) = √(3 × 8.314 × 300/0.028) ≈ √(2.67 × 10⁵) ≈ 517 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One mole of an ideal gas expands isothermally and reversibly at 300 K to twice its initial volume. The work done by the gas is about (R = 8.314 J mol⁻¹ K⁻¹, ln 2 = 0.693):
सही उत्तर: ख) 1729 J
W = nRT ln(V₂/V₁) = 1 × 8.314 × 300 × 0.693 ≈ 1729 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle is projected with kinetic energy E at 45° to the horizontal. Neglecting air resistance, its kinetic energy at the highest point is:
सही उत्तर: ग) E/2
At the top only the horizontal velocity u cos 45° = u/√2 remains, so KE = ½m(u²/2) = E/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform disc of mass 2 kg rolls without slipping on a level surface with a speed of 2 m/s. Its total kinetic energy is:
सही उत्तर: क) 6 J
K = ½mv² + ½(½mR²)(v/R)² = ¾mv² = ¾ × 2 × 4 = 6 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform wire of resistance 12 Ω is bent into a circle. The resistance between two diametrically opposite points is:
सही उत्तर: ख) 3 Ω
Each half has 6 Ω and the two halves are in parallel: 6 × 6/(6 + 6) = 3 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 kg block on a smooth horizontal table is connected by a light string passing over a smooth pulley at the edge to a 3 kg block hanging freely. The acceleration of the system is (g = 10 m/s²):
सही उत्तर: घ) 6 m/s²
Only the hanging weight drives both masses: a = 3g/(2 + 3) = 30/5 = 6 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among radio waves, microwaves, ultraviolet rays and X-rays, the one with the shortest wavelength is:
सही उत्तर: क) X-rays
In the EM spectrum, X-rays have shorter wavelength than UV, which in turn is shorter than microwaves and radio waves.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a transistor with common-base current gain α = 0.98, the common-emitter current gain β is:
सही उत्तर: ग) 49
β = α/(1 − α) = 0.98/0.02 = 49.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Boolean expression for a two-input NOR gate is:
सही उत्तर: क) Y = (A + B)′
NOR is OR followed by NOT.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The output of a two-input AND gate when the inputs are A = 1 and B = 0 is:
सही उत्तर: ग) 0
An AND gate gives 1 only when all inputs are 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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