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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Which of the following reactions demonstrates an exothermic process? a) Decomposition of calcium carbonate to form calcium oxide and carbon dioxide. b) Neutralization reaction between a strong acid and a strong base. c) Formation of ammonia from nitrogen and hydrogen gases. d) Dissolution of sodium chloride in water.
सही उत्तर: क) a) Decomposition of calcium carbonate to form calcium oxide and carbon dioxide.
The decomposition of calcium carbonate (CaCO₃) is an exothermic process because it involves the breaking of bonds to form calcium oxide (CaO), carbon dioxide (CO₂), and releases heat. The other options represent endothermic processes where energy is absorbed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard enthalpy of formation (ΔH°f) of an element in its most stable state is defined as: a) The heat released when one mole of the element reacts with oxygen. b) The heat absorbed when one mole of the element is formed from its constituent elements under standard conditions. c) The heat required to vaporize one mole of the element. d) The change in enthalpy during any chemical reaction involving only that element.
सही उत्तर: ख) b) The heat absorbed when one mole of the element is formed from its constituent elements under standard conditions.
The standard enthalpy of formation (ΔH°f) represents the heat absorbed or released when one mole of a substance is formed from its elements under *standard conditions* (298 K and 1 atm). This value is always negative because it's the process of forming something from simpler components. The key aspect here is ‘standard conditions’.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes Le Chatelier's principle? a) A system at equilibrium will shift in any direction if heat is added. b) A system at equilibrium, when subjected to a stress (e.g., change in concentration or pressure), will adjust itself to minimize the stress. c) The rate of a chemical reaction always increases with increasing temperature. d) Equilibrium constants are solely determined by the initial concentrations of reactants and products.
सही उत्तर: ख) b) A system at equilibrium, when subjected to a stress (e.g., change in concentration or pressure), will adjust itself to minimize the stress.
Le Chatelier's principle states that if a change of condition is applied to a system in equilibrium, the system will shift in a direction that relieves the stress. This primarily involves shifting the position of equilibrium to counteract the imposed stress (e.g., adding reactant or pressure).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following vascular bundles found in dicot stems typically contains phloem only on the abaxial side? (A) Cambium. (B) Protoxylem. (C) Xylem. (D) Metaxylem.
सही उत्तर: घ) Metaxylem.
During secondary growth, the xylem cells (protoxylem) generally remain in the center of the stem, while phloem develops on the periphery. The metaxylem continues to develop and carries water; the cambium produces new xylem and phloem – (C) is correct. The other options relate to different vascular bundles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of CAM plants in water conservation? (A) They open their stomata fully throughout the day to maximize carbon dioxide uptake. (B) They carry out photosynthesis during the day and fix carbon dioxide at night. (C) They rely solely on diffusion for nutrient absorption from the soil. (D) They have reduced leaf surface area to minimize water loss.
सही उत्तर: ख) They carry out photosynthesis during the day and fix carbon dioxide at night.
CAM plants (Crassulaceae) temporally separate carbon fixation and the Calvin cycle by opening their stomata primarily at night, reducing water loss during the day – (B) is correct. The other options describe incorrect strategies for water conservation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘sink strength’ in plants refers to: (A) The ability of a plant to resist environmental stresses like drought. (B) The capacity of a plant part to attract and utilize resources from other parts of the plant. (C) The resistance of a plant stem to bending under physical pressure. (D) The speed at which a seed germinates upon receiving water.
सही उत्तर: ख) The capacity of a plant part to attract and utilize resources from other parts of the plant.
Sink strength describes the ability of a specific plant organ (e.g., fruit or leaf) to attract and channel resources like sugars produced during photosynthesis – (B) is correct. The other options describe different aspects of plant physiology.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements accurately describes the process of pollination in flowering plants? (A) Pollen grains are transported by insects to the stigma. (B) Pollen grains germinate on the stigma and grow a pollen tube down to the ovule. (C) Seeds develop directly from petals after fertilization. (D) Stomata facilitate the transfer of pollen between flowers.
सही उत्तर: ख) Pollen grains germinate on the stigma and grow a pollen tube down to the ovule.
Pollination begins with the germination of the pollen grain on the stigmatic surface. The resulting growth of the pollen tube is a crucial step in delivering sperm to the ovule – (B) correctly describes this process. Options A and C refer to external vectors or seed development, not pollination itself; D incorrectly associates stomata with pollen transfer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The primary function of the Casparian strip in the root endodermis is: (A) To facilitate water movement into the xylem. (B) To regulate the uptake of minerals from the soil. (C) To provide structural support to the root cells. (D) To allow for gas exchange between the cytoplasm and the surrounding soil.
सही उत्तर: ख) To regulate the uptake of minerals from the soil.
The Casparian strip is a waterproof band found in the endodermis of plant roots. It forces water and mineral ions to cross a plasma membrane before entering the xylem vessels, thus regulating their entry into the vascular cylinder – (B) is correct. The other options describe different functions or structures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following structures is responsible for maintaining internal homeostasis by regulating water balance in the human kidney?
सही उत्तर: ख) b) Nephron Loop
The nephron loop (option b), specifically its descending and ascending limbs, plays a critical role in reabsorbing water and solutes from the filtrate back into the bloodstream, regulating blood volume and pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ‘fight or flight’ response in mammals is primarily mediated by which component of the autonomic nervous system?
सही उत्तर: ग) c) The sympathetic branch
Option (c) – the sympathetic branch – controls the ‘fight or flight’ response, triggering adrenaline release and physiological changes preparing the body for action. The other options are associated with different autonomic functions.
💬 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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