कृषि, पशु र वन विज्ञान B.Sc. Ag र B.V.Sc. & A.H. प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Ag र B.V.Sc. & A.H. प्रवेश
B.Sc. Ag & B.V.Sc. Entrance · Agriculture, Veterinary & Forestry Entrance
२,४५४ 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 electromagnetic spectrum, which radiation has the longest wavelength?
सही उत्तर: ख) Radio waves
Radio waves have the longest wavelength and lowest frequency; gamma rays have the shortest wavelength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The output of a two-input AND gate when the inputs are 1 and 0 is:
सही उत्तर: ख) 0
An AND gate gives output 1 only when all inputs are 1. With inputs 1 and 0, the output is 0 (an OR gate would give 1).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a p-type semiconductor, the majority charge carriers are:
सही उत्तर: घ) Holes
Trivalent impurities create holes, which are the majority carriers in p-type material; electrons are the minority carriers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When pure silicon is doped with phosphorus (a pentavalent element), the semiconductor formed is:
सही उत्तर: ग) n-type
Phosphorus has 5 valence electrons; the extra electron becomes a free charge carrier, giving an n-type semiconductor. Trivalent dopants like boron give p-type.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy of the Sun is produced mainly by:
सही उत्तर: क) Nuclear fusion
In the Sun's core, hydrogen nuclei fuse to form helium, releasing energy. Fission (splitting heavy nuclei) is used in nuclear power reactors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which radiation has the greatest penetrating power?
सही उत्तर: ग) Gamma rays
Gamma rays are uncharged high-energy electromagnetic waves and penetrate the most. Alpha particles are the least penetrating and are stopped by paper.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a nucleus emits a beta particle (β⁻), its atomic number:
सही उत्तर: ख) Increases by 1
In β⁻ decay a neutron changes into a proton and an electron, so Z increases by 1 while mass number stays the same. Alpha emission decreases Z by 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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After three half-lives, the fraction of a radioactive sample that remains undecayed is:
सही उत्तर: घ) 1/8
Each half-life halves the amount: (1/2)³ = 1/8. Thus 7/8 of the sample has decayed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy of an electron in the ground state of a hydrogen atom is:
सही उत्तर: ख) −13.6 eV
Eₙ = −13.6/n² eV; for n = 1 it is −13.6 eV. −3.4 eV is the energy of the first excited state (n = 2).
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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