चिकित्सा शिक्षा आयोग (CEE) आयुर्वेद र होमियोप्याथी (BAMS) तयारी
चिकित्सा शिक्षा आयोग (CEE) – आयुर्वेद र होमियोप्याथी (BAMS)
BAMS Entrance · Medical Education Commission – CEE
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MBBS/BDS/Nursing 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 aqueous solution near neutral pH, an amino acid such as glycine exists mainly as:
सही उत्तर: ग) a zwitterion (⁺H₃N–CH₂–COO⁻)
The acidic –COOH group transfers a proton to the basic –NH₂ group, forming a dipolar ion (zwitterion); this explains the high melting point and water solubility of amino acids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The common antiseptic 'Dettol' is a mixture of:
सही उत्तर: ख) chloroxylenol and terpineol
Dettol contains chloroxylenol together with terpineol in a suitable solvent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The greater stability of a tertiary carbocation compared with a primary carbocation is mainly explained by:
सही उत्तर: क) hyperconjugation and the +I effect of alkyl groups
More alkyl groups give more α-C–H hyperconjugative structures and more electron release (+I), which disperse the positive charge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hydrogenation of but-2-yne with H₂ over Lindlar's catalyst (Pd/CaCO₃ poisoned with quinoline) gives mainly:
सही उत्तर: ख) cis-but-2-ene
Lindlar's catalyst stops the reduction at the alkene stage and adds both H atoms from the same side (syn addition), giving the cis-alkene.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The monomer of neoprene, a synthetic rubber, is:
सही उत्तर: ख) chloroprene (2-chlorobuta-1,3-diene)
Neoprene is formed by addition polymerisation of chloroprene; isoprene is the monomer of natural rubber.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In double-stranded DNA, guanine pairs with cytosine through:
सही उत्तर: घ) three hydrogen bonds
G≡C pairs are held by three hydrogen bonds, while A=T pairs are held by two.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aspirin, used as an analgesic and antipyretic, is chemically:
सही उत्तर: ग) acetylsalicylic acid
Aspirin is 2-acetoxybenzoic acid (acetylsalicylic acid), made by acetylating salicylic acid; methyl salicylate is oil of wintergreen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Iodoform (CHI₃), a yellow solid with a characteristic smell, was formerly used as:
सही उत्तर: ग) an antiseptic for dressing wounds
Iodoform slowly releases free iodine on contact with skin and tissues, which gives it antiseptic action.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The more stable conformation of ethane is the:
सही उत्तर: ख) staggered conformation
In the staggered form the C–H bonds on adjacent carbons are as far apart as possible, so torsional strain is minimum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The IUPAC name of CH₃–CH(CH₃)–CH₂–CH₃ is:
सही उत्तर: क) 2-methylbutane
The longest chain has 4 carbons (butane) with a methyl group on C-2 when numbered from the nearer end, so the name is 2-methylbutane.
💬 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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