त्रिवि IT प्रवेश B.Sc. CSIT प्रवेश तयारी
त्रिवि IT प्रवेश – B.Sc. CSIT प्रवेश
TU B.Sc. CSIT Entrance · TU IT Entrance (B.Sc. CSIT, BIT, BCA)
२,६०७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
IT 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 mass of 11.2 L of O₂ gas at STP is:
सही उत्तर: क) 16 g
11.2 L at STP is 0.5 mol, and 0.5 × 32 g/mol = 16 g. 32 g is the mass of a full mole (22.4 L).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When 4 g of H₂ reacts with 16 g of O₂ to form water (2H₂ + O₂ → 2H₂O), the mass of water formed is:
सही उत्तर: क) 18 g
4 g H₂ = 2 mol and 16 g O₂ = 0.5 mol; 0.5 mol O₂ needs only 1 mol H₂, so O₂ is the limiting reagent and gives 1 mol (18 g) of water. 36 g would assume H₂ is fully used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The empirical formula of glucose (C₆H₁₂O₆) is:
सही उत्तर: घ) CH₂O
Dividing the subscripts 6, 12, 6 by their highest common factor 6 gives CH₂O. C₆H₁₂O₆ is the molecular formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage of nitrogen by mass in urea, CO(NH₂)₂, is about:
सही उत्तर: ख) 46.7%
Molar mass of urea = 60 g/mol and it contains 28 g of nitrogen, so %N = 28/60 × 100 ≈ 46.7%. 28% confuses the mass of nitrogen with its percentage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equivalent weight of H₂SO₄ (molar mass 98) as an acid is:
सही उत्तर: ग) 49
Equivalent weight = molar mass / basicity = 98/2 = 49. 32.7 would come from dividing by 3, which is correct for H₃PO₄.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The normality of a 0.5 M H₂SO₄ solution is:
सही उत्तर: ख) 1 N
H₂SO₄ is dibasic (n-factor 2), so N = M × 2 = 1 N. 0.25 N comes from dividing by the n-factor instead of multiplying.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molarity of a solution containing 4 g of NaOH dissolved in 500 mL of solution is:
सही उत्तर: क) 0.2 M
Moles of NaOH = 4/40 = 0.1 mol, and molarity = 0.1/0.5 L = 0.2 M. 0.1 M comes from forgetting to divide by the volume in litres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gas occupies 300 mL at 27 °C. At constant pressure, its volume at 127 °C will be:
सही उत्तर: ग) 400 mL
By Charles's law, V₂ = V₁ × T₂/T₁ = 300 × 400/300 = 400 mL. Temperatures must be in kelvin; using °C directly gives the wrong answer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of the universal gas constant R in SI units is:
सही उत्तर: क) 8.314 J mol⁻¹ K⁻¹
R = 8.314 J mol⁻¹ K⁻¹. The value 0.0821 is in L atm mol⁻¹ K⁻¹ and 1.987 is in cal mol⁻¹ K⁻¹, so those numbers do not match these units.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The unusually high boiling point of water compared with H₂S is mainly due to:
सही उत्तर: घ) Hydrogen bonding
Water molecules are linked by strong intermolecular hydrogen bonds, which need extra energy to break. H₂O actually has a lower molar mass (18) than H₂S (34), so mass cannot explain it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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