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 ‘starch sheath’ around the developing embryo in barley seeds primarily serves what protective function?
सही उत्तर: ग) C) It acts as a barrier preventing premature germination and desiccation.
The starch sheath is a key adaptation in barley seeds. Its primary function is to create a physical barrier that prevents premature germination when the seed encounters unfavorable conditions (e.g., cold temperatures or lack of moisture). This allows for successful dormancy and ensures germination only under optimal circumstances. Option A is related to defence mechanisms, while option B describes insulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the case of flowering plants, what is the primary significance of the process known as ‘colchicine effect’?
सही उत्तर: ख) B) It prevents homologous chromosomes from pairing during meiosis.
The ‘colchicine effect’ involves the disruption of chromosome pairing during meiosis. This occurs due to colchicine binding to tubulin proteins, preventing spindle fiber formation and thus inhibiting proper chromosome segregation. Option A is incorrect as it describes a different process (mutation). Option C relates to pollination, while option D refers to cell division in general.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The decomposition of lead(II) iodide (PbI₂) is an endothermic reaction. Which statement accurately describes this process?
सही उत्तर: ग) Increasing the temperature increases the rate of decomposition
According to Le Chatelier's principle, a system at equilibrium will shift to relieve stress. In this case, increasing the temperature (adding heat) is a stress. The system responds by shifting towards the products (decomposition), thus increasing the rate of decomposition. This means decreasing temperature increases the rate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reaction: N₂O₅ → 4NO₂ + O₂ is reversible. At equilibrium, the concentration of N₂O₅ is 0.1 M and the concentration of NO₂ is 0.8 M. What is the value of the equilibrium constant Kp for this reaction?
सही उत्तर: घ) 16
Kp = (PNO₂)⁴ / (P(N₂O₅) * P(O₂)) We assume standard temperature and pressure. So, P(NO₂) = 0.8, P(N₂O₅) = 0.1, and P(O₂) = 0.8. Therefore, Kp = (0.8)⁴ / (0.1 * 0.8) = 4.096 / 0.08 = 51.2. This value is not among the provided options, which indicates a mistake in the question formulation or expected answer. However, we can correct it based on the logic above : Kp = (PNO₂)⁴ / (P(N₂O₅) * P(O₂)) = (0.8)^4/(0.1*0.8) = 51.2 which is closest to 51.2 and by approximation, it is closest to 51. This shows that the question cannot be answered directly, but instead of calculating Kp as above, lets look at its ratio : (PNO₂/P(N₂O₅))= (0.8/0.1) = 8. The given options clearly show there is some mistake in formulating the problem or provided answer. I'm assuming that the required answer should have been 8
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements correctly describes the trend in ionization energy across a period (left to right) in the periodic table?
सही उत्तर: ग) Ionization energy generally increases with increasing atomic radius
Across a period, the number of protons and electrons increase. This results in a stronger effective nuclear charge, leading to increased attraction for electrons and thus an increase in ionization energy. The option ‘Ionization energy increases with increasing atomic radius’ is incorrect because the opposite trend applies – larger atoms have weaker attraction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pH of a solution containing 0.1 M hydrochloric acid (HCl) and 0.2 M ammonia (NH₃) is approximately: (Ka for NH₃ = 1.8 × 10⁻⁵)
सही उत्तर: क) 0.6
The solution is a buffer solution containing HCl and NH₃. The pH is determined by the Henderson-Hasselbalch equation: pH = pKa + log([NH₃]/[HCl]). Here, pKa = -log(1.8 x 10⁻⁵) ≈ 4.74. Thus, pH = 4.74 + log(0.2/0.1) = 4.74 + log(2) ≈ 4.74 + 0.30 = 5.04. The most tempting answer, 0.6, is incorrect because it doesn't account for the initial concentrations of acid and base.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the primary reason for using concentrated sulfuric acid (H₂SO₄) as a dehydrating agent in organic chemistry?
सही उत्तर: ख) Its strong oxidizing power converts alcohols to ketones and aldehydes efficiently
Option 1 is correct. Concentrated sulfuric acid's effectiveness as a dehydrating agent stems from its strong affinity for oxygen atoms – it pulls those off organic molecules (like alcohols) forming alkenes efficiently. The other options are incorrect. It doesn’t form hydrogen gas, its oxidizing power isn't the primary reason for dehydration, and it’s not a catalyst.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The decomposition of lead(II) iodide (PbI₂) upon heating produces lead monoxide (PbO) and iodine vapor (I₂). Which statement correctly describes the reaction?
सही उत्तर: क) It’s a redox reaction involving reduction of Pb²⁺ to PbO and oxidation of I⁻ to I₂
Option 0 is correct as it accurately describes the reaction – lead(II) iodide decomposes into lead monoxide and iodine vapor, reflecting changes in oxidation states (Pb²⁺ is reduced to PbO while I⁻ is oxidized to I₂). The other options are incorrect; this process is not exothermic, the reaction isn't reversible in the way presented, and doesn’t involve single electron transfer. This aligns with standard chemical knowledge regarding lead iodide decomposition.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform conducting wire of length L is carrying a current I. The magnetic field at any point on the wire is given by B. Which of the following statements is correct? (a) B is directly proportional to I. (b) B is inversely proportional to L. (c) B is independent of both I and L. (d) B is proportional to both I and L.
सही उत्तर: ख) inversely proportional to L
The magnetic field (B) produced by a current-carrying wire is given by the formula B = μ₀I/L, where μ₀ is the permeability of free space. This shows that B is directly proportional to I and inversely proportional to L. Options (b), (c), and (d) are incorrect as they misinterpret the relationship between these variables.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mass of 5 kg is attached to a frictionless horizontal surface. A force F is applied to it over a distance d. If the work done by the force is 100 J, what is the magnitude of the force? (a) 20 N (b) 30 N (c) 40 N (d) 50 N
सही उत्तर: ग) 40 N
Work done (W) is defined as W = Fdcosθ, where θ is the angle between the force and displacement. Since the surface is horizontal, cos90° = 0. Therefore, W = Fd. Solving for F, we get F = W/d = 100 J / 5 kg = 20 N. Options (a), (b), (c) and (d) are incorrect results.
💬 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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