मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · २,०३९ प्रश्न
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CEE 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 best describes the function of the contractile ring formed during cell division?
सही उत्तर: ख) B) It allows for accurate segregation of duplicated chromosomes into daughter cells.
Option B correctly identifies the purpose of the contractile ring: to physically divide the cytoplasm and ensure that each new cell receives a complete set of chromosomes. Options A and C relate to other cellular structures, while option D is related to DNA replication.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of ‘negative feedback’ primarily functions to maintain homeostasis within an organism. Which of the following best describes this mechanism?
सही उत्तर: ख) B) Counteracting deviations from a set point to stabilize conditions.
Option B is correct as negative feedback loops work by opposing or reversing the initial stimulus, bringing the system back towards its equilibrium. Option A describes positive feedback, which amplifies changes. Option C refers to sensitization, and option D concerns adaptation via mutation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric field E = 100 N/C makes an angle of 60° with the x-axis. A charge q = 5 μC is placed at the point (2 cm, 3 cm). What is the magnitude of the force on the charge?
सही उत्तर: क) 0.7 N
The force on a charge in an electric field is given by F = qEsinθ, where θ is the angle between the electric field and the position vector. In this case, sin(60°) = √3/2. Therefore, F = 5 * 10^-6 C * 100 N/C * (√3/2) = 0.7 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car travels at a constant speed of 60 km/h. If its engine consumes fuel at a rate of 20 liters per hour, what is the distance it covers in 3 hours?
सही उत्तर: ख) 240 km
Distance = Speed x Time. In this case, Distance = 60 km/h * 3 h = 180 km. The fuel consumption is irrelevant to the distance covered given the constant speed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of converting an alcohol into aldehydes or ketones using mild acidic conditions is known as:
सही उत्तर: क) Oxidation
The term for this specific conversion is ‘mild acid hydrolysis’ or ‘acid-catalyzed cleavage’. Oxidation involves the addition of oxygen, reduction involves the removal of oxygen, condensation involves joining molecules, and dehydration involves removing water. This process specifically targets alcohol functional groups.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reaction of 2 moles of potassium manganate(II) with acidified potassium dichromate solution results in a colour change from purple to green. This is because:
सही उत्तर: ख) Potassium manganate(II) oxidizes Cr₂O₇²⁻ to Cr³⁺.
Potassium manganate(II) is the oxidizing agent in this redox reaction, while potassium dichromate is the reducing agent. The reduction of Cr₂O₇²⁻ to Cr³⁺ causes the color change. Options B and C are incorrect because they describe the opposite reactions. Option D is a plausible but irrelevant explanation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements regarding acids and bases is correct according to the Arrhenius definition?
सही उत्तर: ख) Bases are substances that produce hydrogen ions (H⁺) in aqueous solution.
The Arrhenius definition states that acids produce H⁺ ions and bases produce OH⁻ ions in aqueous solutions. Option A describes this relationship accurately. Options B, C, and D describe definitions from other theories (like Bronsted-Lowry or Lewis) which are not the Arrhenius definition.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the primary role of anthocyanins, pigments responsible for the red, purple, and blue colors in many flowers and fruits?
सही उत्तर: ग) Attraction of pollinators and seed dispersers
Anthocyanins primarily function as pigments to attract pollinators and seed dispersers. The bright colors signal the presence of valuable resources – nectar in flowers and ripe fruit in fruits - to animals. This is a well-established ecological role.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Consider a mature potato tuber. Which tissue type predominantly contributes to its storage capacity?
सही उत्तर: क) Parenchyma
The parenchyma cells in the potato tuber are specialized for storing starch and other nutrients. These cells have large vacuoles and thin cell walls ideal for accumulating carbohydrates. Collenchyma and sclerenchyma provide structural support whereas the epidermis provides protection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following cellular organelles is primarily responsible for synthesizing secondary metabolites, including alkaloids and tannins?
सही उत्तर: ग) Plastids (specifically chloroplasts and chromoplasts)
Plastids, particularly chloroplasts and chromoplasts, are the sites of secondary metabolite synthesis. These compounds play vital roles in plant defense mechanisms and adaptation to environmental stresses. The other organelles have distinct primary functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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