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
२,४९३ 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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Fish may suffocate in warm water in summer because:
सही उत्तर: क) the solubility of oxygen in water decreases as temperature rises
The solubility of gases in liquids falls with increasing temperature, so warm water holds less dissolved oxygen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Metals conduct electricity because of:
सही उत्तर: ख) a 'sea' of mobile valence electrons
In metallic bonding, positive ions sit in a lattice surrounded by delocalised electrons that can move freely.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The two nitrogen atoms in a nitrogen molecule (N₂) are joined by a:
सही उत्तर: क) triple covalent bond
Each N shares three electrons, forming N≡N, which is why N₂ is very stable.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which noble gas has only two electrons in its outermost shell?
सही उत्तर: घ) Helium
Helium (1s²) has a complete first shell with 2 electrons; the other noble gases have 8 outer electrons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Magnesium and calcium belong to which group of the periodic table?
सही उत्तर: क) Group 2 (alkaline earth metals)
Both have two valence electrons (ns²) and are alkaline earth metals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A positive ion (cation) is always smaller than its parent atom because:
सही उत्तर: घ) it has fewer electrons, so the remaining ones are pulled more strongly by the nucleus
Losing electrons (often a whole shell) increases the effective nuclear charge per electron, shrinking the ion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An element has the electronic configuration 2, 8, 8, 2. Its atomic number and identity are:
सही उत्तर: ख) 20, calcium
2 + 8 + 8 + 2 = 20 electrons, so Z = 20, which is calcium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Deuterium, an isotope of hydrogen, contains in its nucleus:
सही उत्तर: घ) one proton and one neutron
Protium has 1 proton, deuterium 1 proton + 1 neutron, and tritium 1 proton + 2 neutrons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mass of potassium nitrate, KNO₃ (molar mass 101 g/mol), that contains 14 kg of nitrogen is:
सही उत्तर: ख) 101 kg
Each mole of KNO₃ (101 g) contains 14 g N, so 14 kg N is in 101 kg of KNO₃.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage of water of crystallisation in blue vitriol, CuSO₄·5H₂O, is about (Cu = 63.5, S = 32, O = 16, H = 1):
सही उत्तर: क) 36%
Molar mass = 159.5 + 90 = 249.5 g/mol; water = 90/249.5 × 100 ≈ 36%.
💬 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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