कृषि, पशु र वन विज्ञान प्रवेश
कृषि, पशु र वन विज्ञान प्रवेश
Agriculture, Veterinary & Forestry Entrance · २,४९३ प्रश्न
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि/वन 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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100 mL of 2 M HCl is diluted with water to 500 mL. The molarity of the diluted solution is:
सही उत्तर: ख) 0.4 M
Using M₁V₁ = M₂V₂: 2 × 100 = M₂ × 500, so M₂ = 0.4 M. Dilution lowers concentration, so 10 M is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ammonium sulphate applied repeatedly to soil tends to make the soil:
सही उत्तर: क) More acidic
Nitrification of NH₄⁺ by soil bacteria releases H⁺ ions, and sulphate remains, so the soil becomes more acidic. That is why it is called a physiologically acidic fertilizer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A reaction is spontaneous at constant temperature and pressure when:
सही उत्तर: क) ΔG is negative
A negative Gibbs free energy change (ΔG = ΔH − TΔS < 0) indicates spontaneity. A positive ΔH alone does not decide spontaneity; e.g. ice melting above 0 °C is endothermic yet spontaneous.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At constant temperature, 2 L of a gas at 1 atm is compressed to 4 atm. The new volume is:
सही उत्तर: ख) 0.5 L
By Boyle's law P₁V₁ = P₂V₂, so V₂ = (1 × 2)/4 = 0.5 L. Volume falls as pressure rises, so 8 L is wrong.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electron was discovered by:
सही उत्तर: ख) J. J. Thomson
J. J. Thomson discovered the electron in 1897 using cathode-ray experiments. Chadwick discovered the neutron in 1932.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of moles present in 22 g of carbon dioxide (CO₂) is:
सही उत्तर: क) 0.5
Molar mass of CO₂ is 12 + 2(16) = 44 g/mol, so 22/44 = 0.5 mol. 1 mol of CO₂ would weigh 44 g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The oxidation state of manganese in KMnO₄ is:
सही उत्तर: ग) +7
+1 + x + 4(−2) = 0 gives x = +7. Manganese is +6 in K₂MnO₄ (manganate), a common confusion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The IUPAC name of HCHO (formaldehyde) is:
सही उत्तर: क) Methanal
HCHO is the one-carbon aldehyde, named methanal; its aqueous solution (about 40%) is formalin. Methanol is CH₃OH, an alcohol.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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