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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A block of wood floats in static equilibrium in a fluid with density 1000 kg/m³. If the density of the wood is 800 kg/m³, what percentage of the block’s volume is submerged? (Assume g = 9.8 m/s²)
सही उत्तर: ख) 50%
The buoyant force equals the weight of the water displaced by the submerged portion of the block. Therefore, ρ_wood * V_submerged = ρ_fluid * V_displaced. Solving for the percentage submerged gives: (ρ_wood / ρ_fluid) * 100%. The other options result from incorrect calculations considering either the volume ratios or applying the buoyant force incorrectly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A balloon submerged in water has an internal pressure greater than the external atmospheric pressure. The radius of the balloon is 5 mm. If the surface tension of water is 0.073 N/m and the density of water is 1000 kg/m³, what is the depth to which the balloon will sink? (Assume the volume of the balloon is negligible compared to the volume of the water displaced)
सही उत्तर: क) 0.5 mm
The balloon sinks due to buoyancy force. The buoyant force equals the weight of the water displaced by the submerged portion of the balloon. Surface tension opposes this force. Therefore, a deeper submersion is required for it to sink. The correct answer relates these factors, and the other options don't adequately account for both surface tension and buoyancy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of a waxy cuticle on leaves helps plants to: (a) Increase their photosynthetic rate. (b) Reduce water loss through transpiration. (c) Absorb more sunlight for photosynthesis. (d) Enhance nutrient uptake from the soil.
सही उत्तर: ख) (b) Reduce water loss through transpiration.
The waxy cuticle is a protective layer that minimizes water evaporation from the leaf surface, conserving valuable water resources.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the role of xylem in plants? (a) It transports sugars produced during photosynthesis from leaves to other parts of the plant. (b) It transports water and mineral ions absorbed by roots to other parts of the plant. (c) It facilitates gas exchange between the atmosphere and photosynthetic cells. (d) It provides structural support to the plant stem and branches.
सही उत्तर: ख) (b) It transports water and mineral ions absorbed by roots to other parts of the plant.
Xylem is responsible for transporting water and dissolved minerals from the roots upwards throughout the plant. Sugars are transported via phloem.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of pollination in orchids is a remarkable example of plant-pollinator mutualism. Which of the following best describes the primary mechanism involved? (a) Wind dispersal of pollen. (b) Insect attraction through vibrant floral colors and scents. (c) Direct transfer of pollen by water currents. (d) Self-pollination facilitated by specialized anthers.
सही उत्तर: ख) (b) Insect attraction through vibrant floral colors and scents.
Orchids have evolved intricate mechanisms to attract specific pollinators, typically insects, using elaborate flowers with strong fragrances and bright colors. Wind dispersal is a general method but not specific to orchids.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the role of CAM photosynthesis in plants adapted to arid environments? (a) It occurs continuously throughout the day and night. (b) It involves opening stomata during the day to maximize carbon dioxide uptake. (c) It uses a specialized enzyme, RuBisCO, to fix carbon dioxide at night. (d) It allows for rapid carbon fixation in response to increased sunlight.
सही उत्तर: ग) (c) It uses a specialized enzyme, RuBisCO, to fix carbon dioxide at night.
CAM photosynthesis (Crassulacean Acid Metabolism) is characterized by opening stomata primarily at night to minimize water loss due to transpiration and storing the fixed carbon as malic acid. This contrasts with C3 and C4 photosynthesis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solution has a pH of 6. What is the concentration of hydroxide ions [OH⁻] in mol/L?
सही उत्तर: घ) 1 x 10⁻⁵ M
pH = -log[H⁺]. Therefore, [H⁺] = 10^(-pH) = 10^(-6). The concentration of hydroxide ions is related to the hydrogen ion concentration by the equation Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴ at 25°C. So [OH⁻] = Kw / [H⁺] = (1.0 x 10⁻¹⁴) / (1.0 x 10⁻⁶) = 1.0 x 10⁻⁸ M or 1 x 10⁻⁸ M. The option “1x 10^-4 M” is not correct, as the concentration should be much smaller.”},{
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reaction between hydrochloric acid (HCl) and sodium carbonate (Na₂CO₃) produces carbon dioxide gas. What is the volume of carbon dioxide produced when 10 cm³ of HCl reacts completely with excess Na₂CO₃ at STP?
सही उत्तर: ख) 20 cm³
The balanced equation for the reaction is HCl + Na₂CO₃ → NaCl + H₂O + CO₂. According to Avogadro's Law, at STP, 22.4 L of gas occupies one mole. Since HCl reacts completely with excess Na₂CO₃, it produces one mole of CO₂. Therefore, the volume produced will be 22.4L/mole * 1 mole = 22.4 cm³. Closest answer to calculation is 20cm³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molar mass of a gas is 30 g/mol. If 1 mole of the gas occupies a volume of 22.4 L at STP, what is the density of the gas in g/L?
सही उत्तर: क) 2.7 g/L
The density is calculated by dividing the molar mass by the volume occupied at STP. Molar mass = 30g/mol and volume = 22.4L, therefore Density = 30 / 22.4 = 1.32g/L (approximately). The option '3.0 g/L' is far too high. Options '2.7 g/L', '6.0 g/L' and ‘1.5 g/L’ are less plausible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In amphibians, the tympanic membrane (eardrum) is primarily used for:
सही उत्तर: ग) C. Filtering external sounds into specific frequencies.
The tympanic membrane is a thin, membrane-like structure that vibrates in response to sound waves, allowing amphibians to detect these vibrations and process them as auditory information; options A, C, and D describe functions other than acoustic detection.
💬 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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