पोखरा र पूर्वाञ्चल विश्वविद्यालय PU / PoU BE प्रवेश तयारी
पोखरा र पूर्वाञ्चल विश्वविद्यालय – PU / PoU BE प्रवेश
PU BE Entrance · Pokhara & Purbanchal University BE
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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Five 100 W bulbs are used for 6 hours a day for 30 days. At Rs 10 per unit (kWh), the cost of energy is:
सही उत्तर: घ) Rs 900
Energy = 0.5 kW × 6 h × 30 = 90 kWh; cost = 90 × 10 = Rs 900.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric heater rated 1000 W at 220 V is operated on 110 V. Assuming its resistance stays constant, its power is:
सही उत्तर: ग) 250 W
P ∝ V² for fixed R: P = 1000 × (110/220)² = 250 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Twelve identical resistors, each R, form the edges of a cube. The equivalent resistance between two diagonally opposite corners (ends of a body diagonal) is:
सही उत्तर: ख) 5R/6
By symmetry the current splits 3 ways, then 6 ways, then 3 ways: R/3 + R/6 + R/3 = 5R/6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A copper coil has resistance 10 Ω at 0 °C. If the temperature coefficient of resistance is 0.004 K⁻¹, its resistance at 50 °C is:
सही उत्तर: क) 12 Ω
R = R₀(1 + αΔT) = 10(1 + 0.004 × 50) = 10 × 1.2 = 12 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A point charge q is placed at one corner of a cube. The total electric flux through the cube is:
सही उत्तर: ग) q/(8ε₀)
Eight such cubes would surround the charge symmetrically, so one cube receives 1/8 of the total flux q/ε₀.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A dielectric slab (K = 2) of thickness d/2 is inserted between the plates of a parallel-plate capacitor of separation d and capacitance C₀. The new capacitance is:
सही उत्तर: घ) 4C₀/3
C = ε₀A/(d − t + t/K) = ε₀A/(d/2 + d/4) = (4/3)ε₀A/d = 4C₀/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 μF capacitor charged to 100 V and a 4 μF capacitor charged to 50 V are connected in parallel with like plates joined. The common potential is:
सही उत्तर: क) 200/3 V
V = (C₁V₁ + C₂V₂)/(C₁ + C₂) = (200 + 200) μC/6 μF = 66.7 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electron starts from rest and moves 5 cm along a uniform electric field of strength 2000 V/m (in the direction it is pushed). Its kinetic energy gained is:
सही उत्तर: ख) 100 eV
ΔV = Ed = 2000 × 0.05 = 100 V, so the electron gains eΔV = 100 eV.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric dipole of moment 2 × 10⁻⁸ C m makes an angle of 30° with a uniform field of 10⁴ N/C. The torque on it is:
सही उत्तर: ख) 10⁻⁴ N m
τ = pE sin θ = 2 × 10⁻⁸ × 10⁴ × 0.5 = 10⁻⁴ N m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At a certain distance from a point charge the potential is 600 V and the field is 200 V/m. The distance and the charge are:
सही उत्तर: क) 3 m and 0.2 μC
E = V/r ⇒ r = 600/200 = 3 m; q = Vr/k = 600 × 3/(9 × 10⁹) = 2 × 10⁻⁷ C = 0.2 μC.
💬 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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