काठमाडौं विश्वविद्यालय KUUMAT / KU CBT तयारी
काठमाडौं विश्वविद्यालय – KUUMAT / KU CBT
KUUMAT / KU CBT · Kathmandu University (KUUMAT / KU CBT)
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
BE/B.Arch 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 mobility of charge carriers in a conductor is defined as:
सही उत्तर: क) drift velocity per unit electric field
μ = v_d/E, measured in m² V⁻¹ s⁻¹.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One heater coil boils a kettle of water in 10 minutes and another in 15 minutes on the same supply. With the two coils connected in series on that supply, the time taken is:
सही उत्तर: क) 25 minutes
For fixed heat H = V²t/R, t ∝ R. In series R = R₁ + R₂, so t = t₁ + t₂ = 25 minutes (in parallel it would be t₁t₂/(t₁ + t₂) = 6 min).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electron enters a uniform electric field with a velocity perpendicular to the field. Its path inside the field is:
सही उत्तर: घ) a parabola
It has constant velocity perpendicular to the field and constant acceleration along it, like a horizontally thrown projectile.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Outside a uniformly charged thin spherical shell, the electric field is:
सही उत्तर: घ) the same as if the whole charge were concentrated at its centre
By Gauss's law, for r > R, E = Q/(4πε₀r²), as for a point charge at the centre.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric potential at a point at distance r from a short dipole of moment p, along a direction making angle θ with the dipole axis, is:
सही उत्तर: ग) p cos θ/(4πε₀r²)
V = (1/4πε₀)(p cos θ/r²); it is maximum on the axis and zero on the equatorial line.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The capacitance of a cylindrical capacitor of length L with inner radius a and outer radius b (vacuum between) is:
सही उत्तर: ग) 2πε₀L/ln(b/a)
The field between the cylinders is λ/(2πε₀r), so V = (λ/2πε₀) ln(b/a) and C = Q/V = 2πε₀L/ln(b/a).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of electric flux is:
सही उत्तर: घ) N m² C⁻¹
Φ = ∮E·dA has units (N/C)(m²) = N m² C⁻¹, which is the same as V m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric field just outside the surface of a charged conductor having surface charge density σ is:
सही उत्तर: ग) σ/ε₀, normal to the surface
Applying Gauss's law to a small pillbox (field zero inside the conductor) gives E = σ/ε₀ directed normally.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mirage seen on hot roads in summer is mainly due to:
सही उत्तर: ग) total internal reflection
Air near the hot road is less dense (lower n), so light from the sky bends upward and finally is totally internally reflected, appearing to come from a pool on the road.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment, if one of the two slits is completely covered, then on the screen:
सही उत्तर: ग) the interference fringes disappear and a single-slit diffraction pattern is seen
Interference needs two coherent sources; with one slit only its diffraction pattern (a broad central maximum) remains.
💬 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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