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
२,४८५ 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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The modern periodic law states that properties of elements are periodic functions of their:
सही उत्तर: ग) Atomic number
Moseley's work showed atomic number is the fundamental property, giving the modern periodic law. Mendeleev's earlier law was based on atomic mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Plaster of Paris has the formula:
सही उत्तर: ख) CaSO₄·½H₂O
Plaster of Paris is calcium sulphate hemihydrate, obtained by heating gypsum (CaSO₄·2H₂O) to about 373 K. It sets hard when mixed with water, turning back into gypsum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The IUPAC name of CH₃COOH is:
सही उत्तर: घ) Ethanoic acid
CH₃COOH has two carbons with a –COOH group, so it is ethanoic acid (acetic acid). Methanoic acid is HCOOH.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Atoms of different elements having the same mass number but different atomic numbers are called:
सही उत्तर: क) Isobars
Isobars share mass number, e.g. ⁴⁰Ar and ⁴⁰Ca. Isotopes are atoms of the same element with different mass numbers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The element with the highest first ionisation energy is:
सही उत्तर: क) Helium
Helium has a very small, fully filled 1s² shell held tightly by the nucleus, giving the highest first ionisation energy (about 2372 kJ/mol). Neon is second-highest among noble gases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which greenhouse gas is released in large amounts from flooded paddy (rice) fields?
सही उत्तर: ख) Methane
Anaerobic decomposition of organic matter in waterlogged paddy soils by methanogenic bacteria releases methane (CH₄). Sulphur dioxide comes mainly from burning sulphur-containing fuels.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A first-order reaction has a rate constant k = 0.0693 min⁻¹. Its half-life is:
सही उत्तर: ख) 10 min
For a first-order reaction t½ = 0.693/k = 0.693/0.0693 = 10 min. The half-life of a first-order reaction does not depend on initial concentration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Across a period from left to right, the atomic radius generally:
सही उत्तर: घ) Decreases
Nuclear charge increases while electrons enter the same shell, pulling them closer and shrinking the atom. Down a group, atomic radius increases because new shells are added.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coordinate (dative) bond is present in:
सही उत्तर: ख) NH₄⁺
In NH₄⁺ the lone pair of nitrogen is donated to H⁺, forming a coordinate bond. CH₄ and H₂ have ordinary covalent bonds; NaCl is ionic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An element with electronic configuration 2, 8, 1 is:
सही उत्तर: ग) Sodium
2 + 8 + 1 = 11 electrons, i.e. atomic number 11, which is sodium. Potassium (Z = 19) also has one valence electron but its configuration is 2, 8, 8, 1.
💬 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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