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
२,४७० 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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If the pOH of a solution at 25 °C is 4, its pH is:
सही उत्तर: क) 10
pH + pOH = 14 at 25 °C, so pH = 14 − 4 = 10. The solution is basic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Tollens' reagent (ammoniacal silver nitrate) gives a silver mirror with:
सही उत्तर: घ) Aldehydes
Aldehydes are easily oxidised and reduce Ag⁺ to metallic silver, forming a mirror. Simple ketones like acetone do not respond, so the test distinguishes the two.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The metal ion present at the centre of the chlorophyll molecule is:
सही उत्तर: क) Magnesium
Chlorophyll is a porphyrin complex with Mg²⁺ at its centre, which is why Mg deficiency causes yellowing (chlorosis). Haemoglobin contains iron instead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The bond order of the O₂ molecule according to molecular orbital theory is:
सही उत्तर: ख) 2
O₂ has 10 bonding and 6 antibonding valence electrons, so bond order = (10 − 6)/2 = 2. A bond order of 3 belongs to N₂.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The scattering of light by colloidal particles, making the path of a beam visible, is called the:
सही उत्तर: ग) Tyndall effect
Colloidal particles are large enough to scatter light, so a beam through a sol becomes visible; true solutions do not show this. Brownian motion is the random zig-zag movement of colloidal particles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sulphuric acid is manufactured on a large scale by the:
सही उत्तर: ख) Contact process
The contact process oxidises SO₂ to SO₃ over V₂O₅ catalyst, and SO₃ is then converted to H₂SO₄. The Ostwald process makes nitric acid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enzyme zymase converts glucose into:
सही उत्तर: क) Ethanol and carbon dioxide
In alcoholic fermentation by yeast, zymase converts C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Invertase, another yeast enzyme, converts sucrose into glucose and fructose.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gypsum (CaSO₄·2H₂O) is commonly used for the reclamation of:
सही उत्तर: घ) Sodic (alkali) soils
Calcium from gypsum replaces exchangeable sodium in sodic soils, and the sodium is then leached as Na₂SO₄. Acidic soils are corrected with lime, not gypsum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hybridisation of each carbon atom in ethyne (C₂H₂) is:
सही उत्तर: घ) sp
Each carbon in HC≡CH forms two σ bonds and two π bonds, so it is sp hybridised with a linear 180° geometry. sp² applies to ethene's double-bonded carbons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of moles in 3.011 × 10²³ molecules of a substance is:
सही उत्तर: ख) 0.5
Moles = number of particles / Avogadro's number = 3.011 × 10²³ / 6.022 × 10²³ = 0.5. One mole would contain 6.022 × 10²³ particles.
💬 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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