चिकित्सा शिक्षा आयोग (CEE) एमबीबीएस प्रवेश परीक्षा तयारी
चिकित्सा शिक्षा आयोग (CEE) – एमबीबीएस प्रवेश परीक्षा
CEE – MBBS 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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Which of the following statements regarding the oxidation state of sulfur in various compounds is correct?
सही उत्तर: घ) S can have different oxidation states depending on the compound
Sulfur exhibits variable oxidation states. In H₂S, sulfur has a -2 oxidation state, while in SO₃ it is +6. The options suggesting only one specific value or inconsistent behavior are incorrect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The enthalpy change (ΔH) for the reaction N₂(g) + 3H₂(g) → 2NH₃(g) is -92.2 kJ/mol. What is the heat absorbed by a system when 3 moles of NH₃ are produced?
सही उत्तर: ख) 184.4 kJ
The reaction is exothermic, releasing heat. The negative sign indicates heat release. The heat absorbed equals the enthalpy change multiplied by the number of moles produced (ΔH * moles). The most plausible incorrect option represents an endothermic reaction or a different calculation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of osmosis plays a crucial role in water movement within plant tissues. Which statement best describes this process?
सही उत्तर: ख) Water moves from an area of low solute concentration to high solute concentration.
Osmosis describes the movement of water across a semi-permeable membrane from a region of higher water potential (lower solute concentration) to a region of lower water potential (higher solute concentration). This ensures cells remain turgid and healthy. The other options describe different types of diffusion or pressure-based phenomena.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During the formation of a seed, what is the primary role of the endosperm?
सही उत्तर: ग) Serving as an initial food reserve for the embryo.
The endosperm is rich in starch and other nutrients, providing the essential food reserves that nourish the developing embryo until it establishes itself as a seedling. While it does contribute to structural support initially, its primary function is as a food source. The other options describe different aspects of seed development.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the function of chlorophyll molecules within chloroplasts?
सही उत्तर: ख) They absorb light energy required for photosynthesis.
Chlorophyll absorbs specific wavelengths of light, primarily red and blue, which drives the process of photosynthesis. This absorbed light energy is then used to convert carbon dioxide and water into glucose and oxygen. The other options describe unrelated cellular processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of transpiration in plants primarily leads to the loss of which substance from leaf cells?
सही उत्तर: ग) Water Vapor (H2O)
Transpiration is the evaporation of water from plant leaves, primarily through stomata. This results in a significant loss of water vapor. The other options are involved in photosynthesis or carbohydrate metabolism but not directly linked to the core process of transpiration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sino-atrial node (SAN), often referred to as the 'pacemaker', of the human heart initiates electrical impulses that trigger heart contractions. What is the primary mechanism responsible for this rhythmic activity?
सही उत्तर: ग) Automatic Depolarization of SA and AV Nodes
The SAN exhibits spontaneous depolarization due to the influx of sodium ions, initiating an action potential that spreads throughout the heart, leading to rhythmic contractions. The other options describe secondary responses or conduction pathways within the heart.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which endocrine cell within the testis directly produces testosterone?
सही उत्तर: ख) Leydig Cells
Leydig cells are specifically responsible for synthesizing and secreting testosterone, which is crucial for male sexual development and function. Sertoli cells provide support to developing sperm cells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In mammalian nephron, nearly all essential nutrients (around 98%) along with approximately 70-80% of filtered electrolytes are reabsorbed in which region?
सही उत्तर: ख) Proximal Convoluted Tubule
The proximal convoluted tubule is the primary site for nutrient and electrolyte reabsorption from glomerular filtrate due to its high density of microvilli and active transport mechanisms. The glomerulus filters, and the loop of Henle plays a role in water regulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The type of cell junction found between adjacent epithelial cells that tightly controls permeability is termed as:
सही उत्तर: ग) Tight Junctions
Tight junctions are specialized cell junctions that form a seal between epithelial cells, preventing the passage of substances. Gap junctions allow communication between cells, while desmosomes and hemidesmosomes provide mechanical strength.
💬 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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