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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Halogens belong to which group of the modern periodic table?
सही उत्तर: ख) Group 17
F, Cl, Br, I and At are in group 17 with seven valence electrons. Group 18 contains the noble gases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), ΔH negative, the yield of ammonia is increased by:
सही उत्तर: ग) Increasing the pressure
Four moles of gas form two, so higher pressure shifts equilibrium to the side of fewer moles (Le Chatelier). A catalyst only speeds attainment of equilibrium and does not change yield.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sucrose on hydrolysis gives:
सही उत्तर: ग) Glucose and fructose
Sucrose is a disaccharide of one glucose and one fructose unit. Glucose plus galactose comes from lactose (milk sugar).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Phenolphthalein indicator in a basic solution shows the colour:
सही उत्तर: घ) Pink
Phenolphthalein is colourless in acidic and neutral solutions and turns pink above pH about 8.3. Methyl orange is yellow in basic solution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of moles of NaOH required to completely neutralise 0.1 mol of H₂SO₄ is:
सही उत्तर: ग) 0.2 mol
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O, so 2 × 0.1 = 0.2 mol NaOH is needed. 0.1 mol would only half-neutralise the dibasic acid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Agricultural lime (CaCO₃ or slaked lime) is added to soil mainly to:
सही उत्तर: ग) Reduce soil acidity
Lime neutralises H⁺ ions in acidic soils, raising the pH. Alkaline soils are instead treated with materials such as sulphur or gypsum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Under identical conditions, the ratio of rates of diffusion of H₂ to O₂ is:
सही उत्तर: क) 4 : 1
By Graham's law, rate ∝ 1/√M, so r(H₂)/r(O₂) = √(32/2) = 4. 16 : 1 is the ratio of molar masses, not of rates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Galvanisation of iron means coating it with:
सही उत्तर: ग) Zinc
Zinc is more reactive than iron and corrodes sacrificially, protecting iron even if the coating is scratched. Tin plating protects only while the layer is unbroken.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage of nitrogen in ammonium nitrate (NH₄NO₃, molar mass 80) is:
सही उत्तर: ग) 35%
NH₄NO₃ contains two N atoms: 28/80 × 100 = 35%. Counting only one N atom gives 17.5%; 46% is the figure for urea.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the Aufbau principle, which orbital is filled immediately before 3d?
सही उत्तर: ख) 4s
By the (n + l) rule, 4s (4 + 0 = 4) has lower energy than 3d (3 + 2 = 5), so 4s fills first. 4p is filled after 3d.
💬 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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