IT प्रवेश – B.Sc. CSIT, BIT, BCA
IT प्रवेश – B.Sc. CSIT, BIT, BCA
IT Entrance – B.Sc. CSIT, BIT & BCA · २,५८३ प्रश्न
२,५८३ 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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Isotopes of an element have:
सही उत्तर: ख) The same atomic number but different mass numbers
Isotopes such as ¹²C and ¹⁴C have the same number of protons but different numbers of neutrons. Atoms with the same mass number but different atomic numbers are isobars.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the Pauli exclusion principle:
सही उत्तर: ग) No two electrons in an atom can have the same set of four quantum numbers
Pauli's principle means one orbital can hold at most two electrons, and they must have opposite spins. The ordering of orbital filling is the Aufbau principle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Electrons occupy degenerate orbitals singly with parallel spins before pairing begins.' This statement is:
सही उत्तर: घ) Hund's rule of maximum multiplicity
Hund's rule governs how electrons fill orbitals of equal energy. The Aufbau principle only says orbitals are filled in order of increasing energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ground-state electronic configuration of copper (Z = 29) is:
सही उत्तर: ग) [Ar] 3d¹⁰ 4s¹
Copper is an exception: a completely filled 3d¹⁰ subshell is extra stable, so one 4s electron moves to 3d. The expected configuration 3d⁹4s² is wrong for Cu.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of orbitals in a d subshell is:
सही उत्तर: ग) 5
For l = 2, m can take 2l + 1 = 5 values, so there are 5 d orbitals. 10 is the maximum number of electrons a d subshell can hold.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum number of electrons that can be accommodated in the shell with n = 3 is:
सही उत्तर: ख) 18
The maximum number of electrons in a shell is 2n², so 2 × 3² = 18. 9 is the number of orbitals (n²) in that shell.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hybridization of phosphorus in PCl₅ is:
सही उत्तर: घ) sp³d
P forms five σ bonds with no lone pairs, so it uses sp³d hybrid orbitals and the shape is trigonal bipyramidal. sp³d² gives six orbitals, as in SF₆.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hybridization of carbon atoms in ethyne (C₂H₂) is:
सही उत्तर: क) sp
Each carbon in ethyne forms a triple bond and has two σ bonds, so it is sp hybridized, giving a linear shape (180°). sp² is the hybridization of carbon in ethene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The average oxidation number of S in Na₂S₂O₃ (sodium thiosulphate) is:
सही उत्तर: ख) +2
2(+1) + 2x + 3(−2) = 0 gives x = +2. +6 is the oxidation state of S in sulphate (SO₄²⁻).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The oxidation number of Cr in K₂Cr₂O₇ is:
सही उत्तर: क) +6
2(+1) + 2x + 7(−2) = 0 gives x = +6. +12 is the total for the two Cr atoms, not for each one.
💬 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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