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 superconductor below its critical temperature has:
सही उत्तर: घ) zero electrical resistance
Below the critical temperature a superconductor's resistance drops to zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistivity of a metallic wire depends on:
सही उत्तर: क) its material and temperature
Resistivity is a property of the material at a given temperature; length and area affect resistance, not resistivity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following does NOT obey Ohm's law?
सही उत्तर: क) a semiconductor diode
A diode's current varies non-linearly with voltage and depends on polarity, so it is a non-ohmic device.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A parallel-plate capacitor remains connected to a battery while its plate separation is doubled. The energy stored in it:
सही उत्तर: ख) becomes half
C becomes C/2 while V stays fixed, so U = CV²/2 is halved.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two electric field lines never intersect because:
सही उत्तर: ग) the field at a point has only one direction
If two lines crossed, the field would have two directions at the crossing point, which is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Huygens' principle, every point on a wavefront:
सही उत्तर: घ) acts as a source of secondary wavelets
Each point on a wavefront emits secondary wavelets; their forward envelope gives the new wavefront.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resolving power of a microscope can be increased by:
सही उत्तर: घ) using light of shorter wavelength
Resolving power of a microscope = 2n sin θ/λ, so a smaller λ (e.g. electrons, UV) gives better resolution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon that proves that light waves are transverse is:
सही उत्तर: क) polarisation
Only transverse waves can be polarised; interference and diffraction occur for longitudinal waves too.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two thin lenses of focal lengths f₁ and f₂ and dispersive powers ω₁ and ω₂ placed in contact form an achromatic doublet if:
सही उत्तर: ख) ω₁/f₁ + ω₂/f₂ = 0
The combined power's variation with colour vanishes when ω₁/f₁ + ω₂/f₂ = 0, which needs one convex and one concave lens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a ray passes through a prism at minimum deviation, the angles of refraction at the two faces are:
सही उत्तर: ग) equal, each A/2
At minimum deviation the ray passes symmetrically, so r₁ = r₂ and r₁ + r₂ = A gives r = A/2.
💬 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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