चिकित्सा शिक्षा आयोग (CEE) बीएस्सी नर्सिङ र बीएनएस प्रवेश तयारी
चिकित्सा शिक्षा आयोग (CEE) – बीएस्सी नर्सिङ र बीएनएस प्रवेश
B.Sc. Nursing & BNS 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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Cnidoblasts (stinging cells) are found in:
सही उत्तर: ख) Hydra
Cnidoblasts containing nematocysts are diagnostic of Cnidaria, such as Hydra. Sycon is a sponge and lacks stinging cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The canal system is a characteristic feature of which phylum?
सही उत्तर: क) Porifera
Sponges (Porifera) have a water canal system through which water enters by ostia and leaves by the osculum. Cnidarians instead have a gastrovascular cavity, not a canal system.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a non-reducing sugar?
सही उत्तर: क) Sucrose
In sucrose, glucose and fructose are joined through both their anomeric carbons, leaving no free hemiacetal group to reduce Fehling's or Tollens' reagent. Maltose and lactose have a free anomeric carbon and are reducing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Natural rubber is a polymer of:
सही उत्तर: ख) Isoprene (cis-polyisoprene)
Natural rubber is cis-1,4-polyisoprene, whose coiled chains give it elasticity. Chloroprene polymerises to neoprene, a synthetic rubber.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Nylon-6,6 is prepared by the condensation polymerisation of:
सही उत्तर: ख) Hexamethylenediamine and adipic acid
Each monomer has six carbon atoms, hence the name nylon-6,6, and they are joined by amide linkages. Ethylene glycol and terephthalic acid give terylene (Dacron).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hinsberg's reagent, used to distinguish primary, secondary and tertiary amines, is:
सही उत्तर: ग) Benzenesulphonyl chloride
Primary amines give a sulphonamide soluble in alkali, secondary amines give an insoluble one, and tertiary amines do not react. Nitrous acid is used in a different test for amines.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Reaction of a Grignard reagent (RMgX) with formaldehyde, followed by hydrolysis, gives a:
सही उत्तर: क) Primary alcohol
RMgX adds to HCHO to give R–CH₂–OH after hydrolysis, a primary alcohol. Other aldehydes give secondary alcohols and ketones give tertiary alcohols.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following does NOT undergo aldol condensation?
सही उत्तर: ग) Benzaldehyde
Aldol condensation requires an α-hydrogen, and benzaldehyde has none. Instead, it undergoes the Cannizzaro reaction with concentrated alkali.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Phenol reacts with chloroform and aqueous NaOH to give salicylaldehyde. This reaction is known as the:
सही उत्तर: ख) Reimer–Tiemann reaction
In the Reimer–Tiemann reaction, dichlorocarbene attacks the phenoxide ring to introduce a –CHO group mainly at the ortho position. Kolbe's reaction of phenol with CO₂ gives salicylic acid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Phenol is more acidic than ethanol because:
सही उत्तर: क) The phenoxide ion is stabilised by resonance
In phenoxide, the negative charge is delocalised into the benzene ring, stabilising the conjugate base. The ethoxide ion has no such resonance and is destabilised by the +I effect of the ethyl group.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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