कृषि, पशु र वन विज्ञान प्रवेश
कृषि, पशु र वन विज्ञान प्रवेश
Agriculture, Veterinary & Forestry Entrance · २,४९३ प्रश्न
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि/वन 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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A transformer has 100 turns in the primary and 500 turns in the secondary. If the primary voltage is 220 V AC, the secondary voltage is:
सही उत्तर: ख) 1100 V
Vs/Vp = Ns/Np, so Vs = 220 × 500/100 = 1100 V (step-up). 44 V results from inverting the turns ratio.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lenz's law, which gives the direction of induced current, is a consequence of the conservation of:
सही उत्तर: क) Energy
The induced current opposes the change that produces it; otherwise energy would be created from nothing. Faraday's law gives the magnitude of induced emf.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The force on a charged particle moving parallel to a uniform magnetic field is:
सही उत्तर: ग) Zero
F = qvB sinθ and θ = 0° gives sin0° = 0. The force is maximum (qvB) when motion is perpendicular to the field.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer is converted into an ammeter by connecting a:
सही उत्तर: ग) Low resistance in parallel
A low resistance shunt in parallel carries most of the current. A high resistance in series converts a galvanometer into a voltmeter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 100 W bulb is used for 10 hours. The electrical energy consumed is:
सही उत्तर: ग) 1 kWh
Energy = 100 W × 10 h = 1000 Wh = 1 kWh, i.e. one 'unit' of electricity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistance of a bulb rated 220 V, 100 W is:
सही उत्तर: क) 484 Ω
R = V²/P = 220²/100 = 48400/100 = 484 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire is stretched uniformly so that its length becomes double. Its resistance becomes:
सही उत्तर: क) Four times
Volume is constant, so doubling length halves the area. R = ρl/A then becomes 2 × 2 = 4 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two resistors of 3 Ω and 6 Ω are connected in parallel. Their equivalent resistance is:
सही उत्तर: क) 2 Ω
1/R = 1/3 + 1/6 = 1/2, so R = 2 Ω. 9 Ω is the series combination; parallel resistance is always less than the smallest resistor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of electrons that make up a charge of 1 coulomb is about:
सही उत्तर: ख) 6.25 × 10¹⁸
n = q/e = 1/(1.6 × 10⁻¹⁹) = 6.25 × 10¹⁸. 6.02 × 10²³ is Avogadro's number and 9 × 10⁹ is the Coulomb constant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the distance between two point charges is halved, the electrostatic force between them becomes:
सही उत्तर: ख) Four times
Coulomb's law: F ∝ 1/r²; halving r gives (1/(1/2))² = 4 times the force.
💬 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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