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
२,४९३ 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 charge carried by one mole of electrons (one faraday) is approximately:
सही उत्तर: ख) 96500 C
1 F = N_A × e ≈ 6.022 × 10²³ × 1.602 × 10⁻¹⁹ ≈ 96500 C. 1.6 × 10⁻¹⁹ C is the charge on a single electron.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The quantum number that determines the shape of an orbital is the:
सही उत्तर: घ) Azimuthal quantum number (l)
The azimuthal (subsidiary) quantum number l defines the subshell and orbital shape (s, p, d, f). The magnetic quantum number gives the orientation in space.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Diammonium phosphate (DAP) fertilizer has the formula:
सही उत्तर: ग) (NH₄)₂HPO₄
DAP contains two ammonium ions per hydrogen phosphate: (NH₄)₂HPO₄, supplying both N and P. NH₄H₂PO₄ is monoammonium phosphate (MAP).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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18 g of glucose (C₆H₁₂O₆, molar mass 180) is dissolved in water to make 500 mL of solution. Its molarity is:
सही उत्तर: ग) 0.2 M
18/180 = 0.1 mol in 0.5 L gives 0.1/0.5 = 0.2 M. 0.1 M would be the answer if the volume were 1 L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Heating an ore strongly in excess air below its melting point, as done for sulphide ores, is called:
सही उत्तर: क) Roasting
Roasting in air converts sulphides to oxides, e.g. 2ZnS + 3O₂ → 2ZnO + 2SO₂. Calcination is heating in limited or no air, typically used for carbonate ores.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Emission of a β-particle from a nucleus results in:
सही उत्तर: ग) Increase of atomic number by 1
In β-decay a neutron changes into a proton and an electron, so Z rises by 1 while the mass number stays the same. Loss of 4 in mass number and 2 in Z is α-decay.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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On strong heating, 50 g of CaCO₃ (molar mass 100) decomposes completely. The mass of CO₂ produced is:
सही उत्तर: घ) 22 g
CaCO₃ → CaO + CO₂; 50 g is 0.5 mol, giving 0.5 × 44 = 22 g CO₂. The remaining 28 g is the mass of CaO formed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A compound contains C = 40%, H = 6.67% and O = 53.3% by mass. Its empirical formula is:
सही उत्तर: घ) CH₂O
Mole ratio C : H : O = 40/12 : 6.67/1 : 53.3/16 = 3.33 : 6.67 : 3.33 = 1 : 2 : 1, giving CH₂O. Glucose (C₆H₁₂O₆) and acetic acid have this same empirical formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most abundant metal in the Earth's crust is:
सही उत्तर: ख) Aluminium
Aluminium makes up about 8% of the crust by mass, the most of any metal. Iron is the second most abundant metal; oxygen is the most abundant element overall.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Temporary hardness of water is caused by the presence of:
सही उत्तर: घ) Bicarbonates of calcium and magnesium
Ca(HCO₃)₂ and Mg(HCO₃)₂ cause temporary hardness, which is removed by boiling as insoluble carbonates precipitate. Chlorides and sulphates cause permanent hardness.
💬 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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