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
२,४८१ 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 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)
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The H–O–H bond angle in a water molecule is about:
सही उत्तर: ख) 104.5°
Two lone pairs on oxygen compress the bond angle below the tetrahedral value of 109.5° to about 104.5°. 109.5° is the angle in CH₄, which has no lone pairs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Amino acids in a protein are joined together by:
सही उत्तर: घ) Peptide bonds
A peptide bond (–CO–NH–) forms between the carboxyl group of one amino acid and the amino group of another. Glycosidic bonds link sugar units in carbohydrates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The volume occupied by 2 moles of an ideal gas at STP (taking molar volume as 22.4 L) is:
सही उत्तर: घ) 44.8 L
One mole of an ideal gas occupies 22.4 L at STP, so 2 mol occupy 2 × 22.4 = 44.8 L. 11.2 L is the volume of half a mole.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Froth flotation is used mainly for concentrating:
सही उत्तर: घ) Sulphide ores
Sulphide ore particles are wetted by oil and carried up in the froth while gangue sinks in water. Gold is often concentrated by amalgamation or cyanide leaching instead.
💬 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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