इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ प्रवेश: 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 drift speed v_d of electrons in a conductor of cross-section A carrying current I (n = free electron density, e = electronic charge) is:
सही उत्तर: घ) I/(neA)
Current I = neAv_d, so v_d = I/(neA).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A point charge q is placed at the centre of a cube. The electric flux through any one face of the cube is:
सही उत्तर: ग) q/(6ε₀)
The total flux q/ε₀ is shared equally by the six symmetric faces, giving q/(6ε₀) per face.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric field near an infinite plane sheet of charge with uniform surface charge density σ is:
सही उत्तर: ख) σ/(2ε₀)
A Gaussian pillbox through the sheet has two faces: 2EA = σA/ε₀, so E = σ/(2ε₀), independent of distance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric field at a distance r from an infinitely long straight wire with uniform linear charge density λ is:
सही उत्तर: क) λ/(2πε₀r)
Applying Gauss's law to a coaxial cylinder of length l: E·2πrl = λl/ε₀, so E = λ/(2πε₀r).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force between two point charges of 1 μC each placed 1 m apart in vacuum is (1/(4πε₀) = 9 × 10⁹ N m² C⁻²):
सही उत्तर: घ) 9 × 10⁻³ N
F = 9 × 10⁹ × (10⁻⁶)²/1² = 9 × 10⁻³ N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dispersive power ω of the material of a thin prism is given by:
सही उत्तर: ग) (n_v − n_r)/(n − 1)
ω = angular dispersion/mean deviation = (n_v − n_r)/(n − 1), where n is the mean refractive index.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnifying power of a compound microscope can be increased by:
सही उत्तर: ख) decreasing the focal lengths of the objective and the eyepiece
M ≈ (L/f₀)(D/fₑ), so smaller focal lengths of the objective and the eyepiece give greater magnification.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment, if the separation between the slits is doubled (other things unchanged), the fringe width becomes:
सही उत्तर: क) half
Fringe width β = λD/d, so doubling d halves β.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Myopia (short-sightedness) is corrected by using:
सही उत्तर: घ) a concave lens
In myopia the image of distant objects forms in front of the retina; a diverging (concave) lens shifts it back onto the retina.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ray of light passes from air into glass of refractive index √3 with an angle of incidence of 60°. The angle of refraction is:
सही उत्तर: ग) 30°
sin r = sin 60°/√3 = (√3/2)/√3 = 1/2, so r = 30°.
💬 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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