कृषि, पशु र वन विज्ञान B.Sc. Forestry प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Forestry प्रवेश
B.Sc. Forestry Entrance · Agriculture, Veterinary & Forestry Entrance
२,४८५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान 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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In the photoelectric effect, the maximum kinetic energy of emitted electrons depends on the:
सही उत्तर: ख) Frequency of incident light
Einstein's equation KE_max = hf − φ shows dependence on frequency. Intensity changes only the number of electrons emitted, not their maximum energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a ferromagnetic substance?
सही उत्तर: क) Nickel
Iron, cobalt and nickel are ferromagnetic. Aluminium is paramagnetic, while copper and bismuth are diamagnetic.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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