आईओई इन्जिनियरिङ प्रवेश (त्रिवि) M.Sc. इन्जिनियरिङ प्रवेश तयारी
आईओई इन्जिनियरिङ प्रवेश (त्रिवि) – M.Sc. इन्जिनियरिङ प्रवेश
IOE M.Sc. Engineering Entrance · IOE Entrance (TU)
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
BE/B.Arch 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 chief ore of aluminium is:
सही उत्तर: ग) Bauxite
Bauxite (Al₂O₃·xH₂O) is the main ore of aluminium. Haematite is an iron ore and galena is a lead ore.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ostwald's process is used for the manufacture of:
सही उत्तर: ख) Nitric acid
Ostwald's process oxidises ammonia over a platinum catalyst to NO, which is converted to HNO₃. Sodium carbonate is made by the Solvay process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the contact process for manufacturing sulphuric acid, the catalyst used to oxidise SO₂ to SO₃ is:
सही उत्तर: क) V₂O₅
Vanadium pentoxide catalyses 2SO₂ + O₂ ⇌ 2SO₃ in the contact process. Iron is the catalyst in the Haber process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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100 mL of a 1 M HCl solution is diluted with water to 500 mL. The new molarity is:
सही उत्तर: ख) 0.2 M
Using M₁V₁ = M₂V₂: 1 × 100 = M₂ × 500, so M₂ = 0.2 M. 0.25 M would result if 400 mL were taken as the final volume.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mass of oxygen required for complete combustion of 16 g of methane (CH₄ + 2O₂ → CO₂ + 2H₂O) is:
सही उत्तर: क) 64 g
16 g CH₄ = 1 mol, which needs 2 mol O₂ = 64 g. 32 g is the mass of only 1 mol of O₂; 44 g is the mass of CO₂ formed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The volume of CO₂ at STP obtained by completely heating 10 g of CaCO₃ (CaCO₃ → CaO + CO₂) is:
सही उत्तर: घ) 2.24 L
10 g CaCO₃ = 0.1 mol, which gives 0.1 mol CO₂ = 0.1 × 22.4 = 2.24 L at STP. 22.4 L would need 100 g of CaCO₃.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a colligative property?
सही उत्तर: ग) Osmotic pressure
Colligative properties depend only on the number of solute particles; these are relative lowering of vapour pressure, boiling point elevation, freezing point depression and osmotic pressure. Viscosity depends on the nature of the substances.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a nucleus emits a beta (β⁻) particle, its atomic number:
सही उत्तर: ख) Increases by 1
In β⁻ decay a neutron changes into a proton and an electron, so Z rises by 1 while mass number is unchanged. Alpha emission decreases Z by 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A radioactive isotope has a half-life of 5 days. Starting with 16 g, the mass remaining after 15 days is:
सही उत्तर: क) 2 g
15 days is 3 half-lives, so the mass = 16 × (1/2)³ = 2 g. 1 g would remain only after 4 half-lives (20 days).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rate of a zero-order reaction:
सही उत्तर: घ) Is independent of the concentration of reactants
For a zero-order reaction, rate = k[A]⁰ = k, a constant. Exponential decay of concentration is characteristic of first-order reactions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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