मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · २,०३९ प्रश्न
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CEE 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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Which of the following statements regarding the hybridisation of carbon atoms in ethyne (C₂H₂) is most accurate? (a) Each carbon atom has sp³ hybridization. (b) Each carbon atom has sp² hybridization. (c) Each carbon atom has sp hybridization. (d) The carbon atoms exhibit resonance structures.
सही उत्तर: ग) (c) Each carbon atom has sp hybridization.
Ethyne (C₂H₂) contains two triple bonds. Each carbon atom is bonded to three other atoms and one hydrogen atom. This requires sp² hybridization for each carbon atom to form the sigma bond with C-H and C-C. Option (a) is incorrect because sp³ would require four bonds, which doesn't occur in ethyne. Option (c) incorrectly suggests sp hybridization.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Plaster of Paris is used in hospitals for making casts to support fractured bones because, when mixed with water, it undergoes rapid hydration and sets into a hard, rigid mass. Which of the following statements BEST explains this process? (a) It reacts vigorously with bone tissue, promoting healing. (b) It forms a strong adhesive bond with the surrounding skin. (c) It undergoes a chemical reaction with water to produce calcium hydroxide and gypsum. (d) It absorbs moisture from the air, increasing its volume and pressure within the fracture site.
सही उत्तर: ग) (c) It undergoes a chemical reaction with water to produce calcium hydroxide and gypsum.
Plaster of Paris (calcium sulfate hemihydrate - CaSO₄·½H₂O) hydrates when mixed with water to form gypsum (CaSO₄·2H₂O). This is a physical process involving the absorption of water, not a chemical reaction. Option (a) is incorrect as it proposes a damaging reaction. Option (b) is wrong as plaster does not create an adhesive bond. Option (d) is also false because plaster doesn't absorb moisture to increase pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If 'ABC' represents the number 123, then what does 'BCD' represent?
सही उत्तर: क) 456
The code is simply substituting each letter with its corresponding position in the alphabet. A = 1, B = 2, C = 3, etc. Therefore, 'BCD' represents 234.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the ratio of boys to girls in a class is 2:3, and there are 18 students in total, how many girls are there?
सही उत्तर: क) 6
Let the number of boys be 2x and the number of girls be 3x. We have 2x + 3x = 18, which means 5x = 18. Therefore, x = 18/5 = 3.6, but since we need whole numbers, there's an error. The correct interpretation is that the ratio represents the proportion of students in the class. Since the total number of students is 18, and the ratio is 2:3, then 2 parts are boys and 3 parts are girls, giving a total of 5 parts. Each part represents 18/5 = 3.6 students. The number of girls is 3 * 3.6 = 10.8 which isn't an integer, so this problem needs to be rethought for the CEE entrance exam
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the missing figure in this sequence: 2, 4, 8, 16, 32, ?
सही उत्तर: क) 48
The sequence represents powers of 2 (2^1, 2^2, 2^3, 2^4, 2^5). The next number is 2^6 = 64.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a typical flower, what is the primary function of the filament?
सही उत्तर: ग) C) To facilitate the transfer of pollen from the stamen to the pistil.
The filament is a slender stalk that supports the anther (where pollen grains are produced). Option A describes the role of petals. Option C discusses pollination, and D refers to nectar production.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of crassulacean acid metabolism (CAM) in plants is primarily an adaptation to:
सही उत्तर: ग) C) Nutrient-poor soils and a need for efficient carbon fixation.
CAM plants evolved to cope with arid conditions. They open their stomata at night to absorb CO₂ minimizing water loss during daylight hours when the leaves would otherwise lose excessive amounts of water due to high light intensity. Option A is incorrect as CAM doesn't require high CO2 levels.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following processes is directly responsible for the creation of secondary xylem (wood) in a tree?
सही उत्तर: ख) B) The activity of cambium cells, which produce new phloem and xylem layers.
Secondary xylem formation occurs due to cell division in the vascular cambium – this layer is responsible for generating new xylem cells. Option A focuses on apical meristems (growth at tips). Option C describes tannin production (a defense mechanism) and D relates to root uptake.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term 'alternation of generations' refers to the life cycle of plants where:
सही उत्तर: ग) C) Plants undergo distinct phases with alternating dominance of haploid (n) and diploid (2n) generations.
Alternation of generations describes the true biological cycle where a plant alternates between a multicellular haploid gametophyte stage that produces gametes and a multicellular diploid sporophyte stage that produces spores. Option A is incorrect as it describes a single organism’s lifecycle. Option B relates to seed production.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the function of stomata in plant leaves?
सही उत्तर: ख) B) They regulate gas exchange (carbon dioxide and oxygen) and water transpiration.
Stomata play a crucial role in gas exchange – allowing carbon dioxide to enter for photosynthesis while releasing oxygen. Option A is incorrect as stomata primarily control *both* gases. Option C is related to roots, and D describes xylem function.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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