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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In which process does the entropy of the system increase?
सही उत्तर: ख) Melting of ice
Turning a solid into a liquid increases the disorder of the molecules, so entropy increases. Freezing, condensation and crystallization are the reverse and decrease entropy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'The total enthalpy change of a reaction is the same whether it takes place in one step or several steps.' This is:
सही उत्तर: ख) Hess's law of constant heat summation
Hess's law follows from enthalpy being a state function, so it depends only on the initial and final states. Le Chatelier's principle is about how equilibria respond to changes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A reaction at constant temperature and pressure is spontaneous when:
सही उत्तर: क) ΔG is negative
A negative Gibbs free energy change (ΔG = ΔH − TΔS) means the process is spontaneous. ΔG = 0 means the system is at equilibrium.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an exothermic reaction:
सही उत्तर: ग) ΔH is negative
In an exothermic reaction heat is released, so the enthalpy of the products is lower and ΔH < 0. Endothermic reactions have ΔH > 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first law of thermodynamics is a statement of:
सही उत्तर: घ) Conservation of energy
The first law (ΔU = q + w) says energy can neither be created nor destroyed. The increase of entropy of the universe is the second law.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which mixture forms an acidic buffer solution?
सही उत्तर: ख) CH₃COOH and CH₃COONa
An acidic buffer is a weak acid with its salt of a strong base. NH₄OH + NH₄Cl is a basic buffer, and HCl + NaCl involves a strong acid, which cannot form a buffer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conjugate base of NH₄⁺ is:
सही उत्तर: ख) NH₃
A conjugate base is formed when an acid loses one proton: NH₄⁺ − H⁺ = NH₃. NH₂⁻ is the conjugate base of NH₃, not of NH₄⁺.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Adding a catalyst to a reaction at equilibrium:
सही उत्तर: ग) Helps equilibrium be reached faster without changing the equilibrium constant
A catalyst lowers the activation energy of the forward and reverse reactions equally, so equilibrium is reached faster but K stays the same. It does not change the equilibrium yield.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the relation between Kp and Kc is:
सही उत्तर: ख) Kp = Kc(RT)⁻²
Kp = Kc(RT)^Δn, with Δn = 2 − 4 = −2. Kp = Kc only when Δn = 0, as in H₂ + I₂ ⇌ 2HI.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), ΔH < 0, the yield of ammonia is increased by:
सही उत्तर: क) Increasing the pressure
The forward reaction reduces the number of gas moles (4 → 2), so higher pressure shifts the equilibrium to the right (Le Chatelier's principle). Since the reaction is exothermic, raising the temperature lowers the yield.
💬 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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