इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ 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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When 4 g of H₂ reacts completely with 32 g of O₂, the mass of water formed is:
सही उत्तर: ग) 36 g
4 g H₂ = 2 mol and 32 g O₂ = 1 mol, exactly the 2 : 1 ratio of 2H₂ + O₂ → 2H₂O, giving 2 mol (36 g) of water. This also agrees with the law of conservation of mass (4 + 32 = 36 g).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The normality of a 0.5 M H₂SO₄ solution is:
सही उत्तर: ख) 1.0 N
Normality = molarity × n-factor; for H₂SO₄ the n-factor is 2, so N = 0.5 × 2 = 1.0 N. 0.25 N comes from dividing instead of multiplying.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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4 g of NaOH is dissolved in water to make 500 mL of solution. Its molarity is:
सही उत्तर: क) 0.2 M
Moles of NaOH = 4/40 = 0.1 mol; molarity = 0.1 mol / 0.5 L = 0.2 M. 0.1 M results if the volume is wrongly taken as 1 L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equivalent weight of H₂SO₄ when it is completely neutralised by NaOH is:
सही उत्तर: घ) 49
H₂SO₄ is dibasic, so equivalent weight = molar mass/basicity = 98/2 = 49. 98 would be the equivalent weight only if it acted as a monobasic acid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage by mass of oxygen in water is approximately:
सही उत्तर: ग) 88.9%
Mass % of O = 16/18 × 100 ≈ 88.9%. 11.1% is the percentage of hydrogen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The volume occupied by 2 g of hydrogen gas at STP (0 °C, 1 atm) is:
सही उत्तर: ख) 22.4 L
2 g of H₂ is 1 mol, and 1 mol of an ideal gas at STP occupies 22.4 L. 11.2 L would correspond to 1 g of H₂ (0.5 mol).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molar mass of sulphuric acid (H₂SO₄) is:
सही उत्तर: क) 98 g/mol
M(H₂SO₄) = 2(1) + 32 + 4(16) = 98 g/mol. 96 g/mol is the mass of the SO₄ group alone, without the two hydrogens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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With increase in temperature, the electrical resistance of a pure (intrinsic) semiconductor:
सही उत्तर: ग) Decreases
Higher temperature breaks more covalent bonds, generating more electron–hole pairs, so conductivity rises and resistance falls. Semiconductors therefore have a negative temperature coefficient of resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a common-emitter transistor, the base current is 50 μA and the collector current is 5 mA. The current gain β is:
सही उत्तर: ख) 100
β = I_C / I_B = 5 × 10⁻³ / 50 × 10⁻⁶ = 100. 1000 results from a unit-conversion error between mA and μA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A p–n junction diode used to convert AC into DC acts as a:
सही उत्तर: क) Rectifier
A diode conducts only in forward bias, allowing current in one direction, which converts AC to pulsating DC (rectification).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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