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 Ostwald process is used for the manufacture of:
सही उत्तर: घ) Nitric acid
In the Ostwald process, ammonia is catalytically oxidized over platinum to NO, which is then converted to HNO₃. Ammonia itself is made by the Haber process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most abundant element in the Earth's crust by mass is:
सही उत्तर: ग) Oxygen
Oxygen makes up nearly half of the Earth's crust by mass, followed by silicon. Aluminium is the most abundant metal in the crust.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Heavy water is:
सही उत्तर: घ) D₂O
Heavy water is deuterium oxide (D₂O) and is used as a moderator in nuclear reactors. H₂O₂ is hydrogen peroxide.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a nucleus emits a beta (β⁻) particle, its:
सही उत्तर: क) Atomic number increases by 1 and mass number stays the same
In β⁻ decay a neutron changes into a proton and an electron, so Z rises by 1 while A is unchanged. A decrease of 2 in Z and 4 in A happens in alpha decay.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An alpha particle is identical to:
सही उत्तर: ख) A helium nucleus
An alpha particle has 2 protons and 2 neutrons (charge +2, mass 4), the same as a He²⁺ nucleus. A beta particle is a fast electron.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A radioactive isotope has a half-life of 5 days. Starting with 16 g, the amount left after 15 days is:
सही उत्तर: ग) 2 g
15 days is 3 half-lives, so 16 → 8 → 4 → 2 g. 4 g is what remains after only 2 half-lives (10 days).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A first-order reaction has a rate constant of 0.0693 min⁻¹. Its half-life is:
सही उत्तर: घ) 10 min
For a first-order reaction, t½ = 0.693/k = 0.693/0.0693 = 10 min. The half-life of a first-order reaction does not depend on the initial concentration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard electrode potential of the standard hydrogen electrode (SHE) is taken as:
सही उत्तर: घ) 0.00 V
The SHE is the reference electrode and is given a potential of exactly 0 V by convention. −0.76 V and +0.34 V are the standard potentials of Zn²⁺/Zn and Cu²⁺/Cu.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an electrolytic cell, oxidation takes place at the:
सही उत्तर: ख) Anode
Oxidation always occurs at the anode and reduction at the cathode, in both galvanic and electrolytic cells. Only the signs of the electrodes differ between the two types.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of one Faraday is approximately:
सही उत्तर: ख) 96500 C mol⁻¹
One Faraday is the charge on one mole of electrons: 6.022 × 10²³ × 1.602 × 10⁻¹⁹ ≈ 96500 C. 1.6 × 10⁻¹⁹ C is the charge of a single electron.
💬 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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