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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If the separation between the plates of a parallel-plate capacitor is halved (area unchanged), its capacitance:
सही उत्तर: ग) doubles
C = ε₀A/d ∝ 1/d.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment performed with white light, the central fringe is:
सही उत्तर: ख) white
At the centre the path difference is zero for every wavelength, so all colours interfere constructively and the central fringe is white.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resolving power of an astronomical telescope can be increased by:
सही उत्तर: ग) increasing the diameter of its objective
Resolving power ∝ D/λ, so a larger aperture objective resolves finer detail.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Unpolarised light passes through a polariser and then through an analyser whose axis is at 60° to that of the polariser. The intensity transmitted by the analyser, compared with that incident on it, is:
सही उत्तर: क) 1/4
Malus's law: I = I₀ cos²60° = I₀/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the whole Young's double-slit apparatus is immersed in water (n = 4/3), the fringe width becomes:
सही उत्तर: ख) 3/4 of its value in air
β = λD/d and the wavelength in water is λ/n, so β becomes 3/4 of the original.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A prism of angle 60° produces a minimum deviation of 30°. The refractive index of its material is:
सही उत्तर: घ) √2
n = sin((A + δm)/2)/sin(A/2) = sin 45°/sin 30° = (1/√2)/(1/2) = √2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An optical fibre transmits light by:
सही उत्तर: घ) total internal reflection
Light inside the core repeatedly suffers total internal reflection at the core–cladding boundary.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum magnifying power of a simple microscope of focal length 5 cm (least distance of distinct vision 25 cm) is:
सही उत्तर: ग) 6
With the image at the near point, M = 1 + D/f = 1 + 25/5 = 6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a glass convex lens is immersed in water, its focal length:
सही उत्तर: क) increases
1/f ∝ (n_glass/n_medium − 1), which becomes smaller in water, so f increases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A biconvex lens of glass (n = 1.5) has both radii of curvature equal to 20 cm. Its focal length in air is:
सही उत्तर: ख) 20 cm
Lens maker's formula: 1/f = (1.5 − 1)(1/20 + 1/20) = 0.5 × 0.1 = 1/20, so f = 20 cm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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