चिकित्सा शिक्षा आयोग (CEE) पारामेडिकल (B.Pharm, BPH, BMLT, BMIT, B.Optom) तयारी
चिकित्सा शिक्षा आयोग (CEE) – पारामेडिकल (B.Pharm, BPH, BMLT, BMIT, B.Optom)
Paramedical Bachelor 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 sponges, water leaves the body through the:
सही उत्तर: घ) osculum
Water enters through many small ostia, passes through the spongocoel and canals, and leaves through the large osculum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The spicules forming the skeleton of the sponge Sycon are made of:
सही उत्तर: ग) calcium carbonate
Sycon belongs to class Calcarea, whose skeleton consists of calcareous (CaCO₃) spicules.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When an optically active alkyl halide undergoes an SN1 reaction at its chiral carbon, the product is mainly:
सही उत्तर: घ) racemic (both configurations formed)
SN1 goes through a planar carbocation that the nucleophile can attack from either face, so a (nearly) racemic mixture results.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of structural isomers having the molecular formula C₄H₉Cl is:
सही उत्तर: घ) 4
They are 1-chlorobutane, 2-chlorobutane, 1-chloro-2-methylpropane and 2-chloro-2-methylpropane.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ozonolysis of 2-methylbut-2-ene, (CH₃)₂C=CH–CH₃, followed by reductive work-up with Zn/H₂O, gives:
सही उत्तर: क) propanone and ethanal
Cleaving the C=C gives (CH₃)₂C=O (propanone) from one end and CH₃CHO (ethanal) from the other.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Propanone (acetone) reacts with ethylmagnesium bromide, and the product is hydrolysed. The alcohol formed is:
सही उत्तर: ग) 2-methylbutan-2-ol
C₂H₅⁻ adds to the carbonyl carbon of (CH₃)₂C=O; hydrolysis gives the tertiary alcohol (CH₃)₂C(OH)C₂H₅, i.e. 2-methylbutan-2-ol.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The artificial sweetener aspartame is used only in cold foods and drinks because it:
सही उत्तर: घ) is unstable at cooking temperature
Aspartame, a dipeptide methyl ester about 100 times sweeter than sucrose, decomposes on heating, so it is unsuitable for cooking.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Benzenediazonium chloride reacts with phenol in mildly alkaline solution to give an orange dye. This dye is:
सही उत्तर: क) p-hydroxyazobenzene
Diazonium coupling with phenol occurs at the para position, giving the orange azo dye p-hydroxyazobenzene (coupling with aniline gives yellow p-aminoazobenzene).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The correct order of acidic strength of ethane, ethene and ethyne is:
सही उत्तर: क) ethyne > ethene > ethane
The s-character of the C–H carbon is 50% (sp) > 33% (sp²) > 25% (sp³); greater s-character holds the anion's lone pair more tightly, so ethyne is the most acidic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A compound has two different chiral carbon atoms and no internal plane of symmetry. The total number of its stereoisomers is:
सही उत्तर: ख) 4
With n different chiral centres the number of stereoisomers is 2ⁿ = 2² = 4 (two pairs of enantiomers).
💬 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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