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 number of structural isomers possible for pentane (C₅H₁₂) is:
सही उत्तर: ख) 3
C₅H₁₂ has three structural isomers: n-pentane, 2-methylbutane and 2,2-dimethylpropane. Two isomers is the answer for butane (C₄H₁₀).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The IUPAC name of CH₃COCH₃ is:
सही उत्तर: क) Propanone
CH₃COCH₃ is a three-carbon ketone, so it is propanone (common name acetone). Propanal (CH₃CH₂CHO) is the isomeric aldehyde.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The brown ring test is used to detect the:
सही उत्तर: घ) Nitrate ion
With FeSO₄ and conc. H₂SO₄, nitrate gives a brown ring of [Fe(H₂O)₅NO]²⁺ at the junction of the liquids. Sulphate is tested with BaCl₂ (white precipitate).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coordination number of the central metal in [Co(NH₃)₆]³⁺ is:
सही उत्तर: ग) 6
Six monodentate NH₃ ligands are attached to Co, so the coordination number is 6. Three is the oxidation state of cobalt, not the coordination number.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the complex ion [Fe(CN)₆]⁴⁻, the oxidation state of iron is:
सही उत्तर: ख) +2
Each CN⁻ is −1, so x + 6(−1) = −4, giving x = +2. The ion [Fe(CN)₆]³⁻ (ferricyanide) has Fe in the +3 state.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which hydrogen halide is the strongest acid in aqueous solution?
सही उत्तर: क) HI
Acid strength increases HF < HCl < HBr < HI because the H–X bond becomes weaker as the halogen gets larger. HF is weakest because of its very strong H–F bond.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sodium metal is stored under kerosene because it:
सही उत्तर: घ) Reacts vigorously with air and moisture
Sodium reacts rapidly with oxygen and violently with water, so it is kept under kerosene, with which it does not react. White phosphorus, by contrast, is stored under water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Froth flotation is mainly used for concentrating:
सही उत्तर: ख) Sulphide ores
In froth flotation, sulphide ore particles are wetted by oil and carried up in the froth while gangue is wetted by water and sinks. Oxide ores are usually concentrated by gravity or magnetic methods or by leaching.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Galena is an ore of:
सही उत्तर: क) Lead (PbS)
Galena is lead sulphide, PbS, the chief ore of lead. ZnS is zinc blende.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemical formula of haematite is:
सही उत्तर: घ) Fe₂O₃
Haematite is iron(III) oxide, Fe₂O₃. Fe₃O₄ is magnetite.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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