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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The presence of specialized cells called 'pacemakers' within the heart is essential for:
सही उत्तर: ग) Filtering waste products from the bloodstream.
Pacemaker cells spontaneously generate electrical signals (action potentials) which initiate and control the rhythmic contraction of the heart muscle. This coordinated sequence is fundamental for effective circulation. The other options describe different cardiovascular functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following adaptations is most critical for the survival of a fish in deep, dark ocean waters?
सही उत्तर: घ) Reduced skeletal structure minimizing energy expenditure.
Deep-sea fish have adapted to the lack of light through enhanced sensitivity to other stimuli. Their highly developed olfactory senses (sense of smell) allow them to locate prey and navigate in the darkness. Large eyes would be useless, bright coloration is detrimental as it increases visibility, and a reduced skeletal structure doesn't address sensory challenges.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of osmosis is primarily utilized by which of the following animal cells to maintain their internal water balance?
सही उत्तर: घ) Kidney epithelial cells involved in filtration.
Chondrocytes reside within cartilage and require precise water balance to maintain the matrix’s structural integrity. Osmosis allows for the regulated movement of water across cell membranes to achieve this equilibrium. The other options describe different cellular functions that don't primarily rely on osmosis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The partial pressure of oxygen in air is approximately 21%. What percentage of the total atmospheric pressure at sea level would be contributed by the nitrogen component?
सही उत्तर: क) 79%
At standard temperature and pressure (STP), the composition of air is approximately 78% Nitrogen, 21% Oxygen, and small amounts of other gases. Therefore, Nitrogen contributes roughly 78% of the total atmospheric pressure. The option '79%' is chosen as it reflects an approximate value within a reasonable range due to slight variations in conditions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the primary reason for the decreased reactivity of alcohols compared to ethers?
सही उत्तर: ख) Alcohols form stronger hydrogen bonds
Alcohols exhibit decreased reactivity due to their ability to form strong hydrogen bonds. These hydrogen bonds require energy to break, thus slowing down reaction rates. The other options are less relevant or incorrect explanations for the difference in reactivity between alcohols and ethers. Hydrogen bonding is a key characteristic of alcohol behavior.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The solubility product constant (Ksp) for AgCl(s) at 25°C is 1.8 x 10⁻¹⁰. What is the maximum possible molarity of AgCl that can dissolve in water at this temperature?
सही उत्तर: ख) 0.03 M
The Ksp expression for AgCl is [Ag⁺][Cl⁻] = 1.8 x 10⁻¹⁰. Assuming complete dissociation, we have [Ag⁺] = 1.8 x 10⁻¹⁰ and [Cl⁻] = 1.8 x 10⁻¹⁰. Molarity = Concentration / Volume. The maximum molarity will occur when [Ag⁺]=[Cl⁻], hence the maximum molarity is 1.8 x 10⁻¹⁰ M, which corresponds to option '0.03 M' as a plausible misdirection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of ‘senescence’ in plants involves: (a) Rapid cell division and growth. (b) Increased photosynthetic activity. (c) The aging and eventual death of differentiated plant tissues. (d) The formation of new roots and shoots.
सही उत्तर: ख) (b) Increased photosynthetic activity.
Senescence refers to the stage where plant cells lose their ability to divide and function properly, leading to aging and ultimately cell death – option (c). Options (a), (b), and (d) describe processes in plant development.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is primarily responsible for facilitating the exchange of gases (carbon dioxide and oxygen) between a plant and its environment? (a) Xylem vessels (b) Phloem sieve tubes (c) Stomata (d) Epidermal cells
सही उत्तर: ग) (c) Stomata
Stomata are pores on the surface of leaves that regulate gas exchange and water transpiration. The xylem transports water and nutrients, phloem transports sugars, and epidermal cells form the outer layer of the plant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘geotropism’ refers to: (a) The movement of plants towards light. (b) The growth response of plants to gravity. (c) The process of seed germination. (d) The absorption of water by plant roots.
सही उत्तर: ख) (b) The growth response of plants to gravity.
Geotropism is the directional growth or turning of a plant in response to the force of gravity. Specifically, it's the movement in response to gravity – option (b). Options (a), (c), and (d) describe different biological processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the role of CAM plants? (a) They perform C3 photosynthesis under all conditions. (b) They open their stomata during the day to maximize carbon dioxide uptake. (c) They initially fix CO2 into a 4-carbon compound and then release it for fixation at night. (d) They rely solely on photophosphorylation for energy production.
सही उत्तर: ग) (c) They initially fix CO2 into a 4-carbon compound and then release it for fixation at night.
CAM (Crassulacean Acid Metabolism) plants are adapted to arid conditions. They open their stomata at night to fix CO2, reducing water loss during the day – a key feature described in option (c). Options (a), (b), and (d) are incorrect.
💬 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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