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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The process of pollination involves the transfer of pollen grains from the anther to the stigma. Which of the following mechanisms is *least* likely to facilitate this transfer?
सही उत्तर: घ) Gravity-assisted movement.
While wind and insect pollination are common methods, gravity assistance in pollen dispersal is not a typical mechanism. Gravity assists with seed fall, but isn't involved in the initial transfer of pollen from anther to stigma; self-pollination involves the same flower.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of abscisic acid (ABA) in plant physiology?
सही उत्तर: ग) Inducing stomatal closure under water stress.
Abscisic acid (ABA) is a hormone primarily involved in responses to drought and other stresses. It triggers stomatal closure to reduce water loss, preventing dehydration. The other options relate to different hormones or processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following processes is most directly associated with the formation of phloem?
सही उत्तर: घ) Lateral meristematic activity within cambium.
Phloem tissue is produced by the cambium, a lateral meristem responsible for growth in width. This process involves cell expansion and differentiation. Transpiration is water movement; cell division occurs in primary tissues; and active transport focuses on mineral uptake.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements best describes the role of a catalyst in a chemical reaction?\u003Cbr>(A) It is consumed during the reaction.\u003Cbr>Not it is consumed, but decreases the activation energy\u003Cbr>It increases the equilibrium constant\u003Cbr>It changes the enthalpy of the reaction
सही उत्तर: ख) Not it is consumed, but decreases the activation energy
A catalyst lowers the activation energy required for a chemical reaction to occur without being permanently altered itself. It speeds up the rate of the reaction, and therefore reduces the time taken for the reaction to reach its endpoint.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 5.0 g sample of an organic compound, containing only carbon and hydrogen, is completely combusted in excess oxygen. The resulting carbon dioxide and water are collected, and their masses are found to be 14.0 g CO₂ and 9.0 g H₂O. What is the empirical formula of the compound?\u003Cbr>(A) C₃H₄\u003Cbr>C₅H₁₀\u003Cbr>C₄H₆\u003Cbr>C₆H₈
सही उत्तर: क) C₃H₄
First, calculate the number of moles of each product: m(CO₂) = 14.0g / 44.0 g/mol = 0.318 mol; m(H₂O) = 9.0g / 18.0 g/mol = 0.500 mol. The ratio of C:H is obtained by dividing the moles of carbon and hydrogen by their lowest common multiple, which simplifies to C₃H₄.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The lanthanide contraction is primarily attributed to:\u003Cbr>(A) Similar size of 4f orbitals\u003Cbr>Radius dependence of screening effect\u003Cbr>Similar electronegativity values\u003Cbr>Increased nuclear charge
सही उत्तर: क) Similar size of 4f orbitals
The lanthanide contraction is the observed decrease in atomic radii within the lanthanide series. This occurs due to the poor shielding effect of the partially filled 4f orbitals—the electrons are not effectively shielded from the nucleus leading to a smaller measured radius and this size shrinkage affects the physical properties.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following processes is most effective for separating a mixture of ferrous oxide and haematite ores?\u003Cbr>(A) Magnetic separation\u003Cbr>Selectively acidic leaching\u003Cbr>Bubble AGM flotation\u003Cbr>Liquid-liquid extraction
सही उत्तर: क) Magnetic separation
The froth flotation method utilizes differences in the surface properties of minerals. Ferrous oxide (iron oxides) are hydrophobic and will attach to air bubbles, allowing them to float to the top during agitation whereas haematite is hydrophilic and remains at the bottom. Magnetic separation relies on magnetic susceptibility, which isn't a primary factor here.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The root mean square (rms) velocity of gas molecules is directly proportional to which of the following?\u003Cbr>(A) Pressure\u003Cbr>Number\u003Cbr>Radius\u003Cbr>Surface area
सही उत्तर: क) Pressure
The root mean square velocity (v_rms) is calculated as v_rms = √(3RT/M), where R is the ideal gas constant, T is the absolute temperature, and M is the molar mass. The formula shows that v_rms is directly proportional to the square root of the temperature (T) and inversely proportional to the square root of the molar mass (M). Since pressure is related to temperature through the Ideal Gas Law (PV=nRT), pressure is indirectly proportional to v_rms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2.0 M solution of sodium chloride (NaCl) is prepared by dissolving 4.3 g of NaCl in water. What is the molarity of the solution in mol/L?
सही उत्तर: क) 1.0 M
The problem involves calculating the molarity of a given concentration. The formula for molarity (M) is moles of solute / liters of solution. We are given 4.3 g of NaCl, and its molecular weight is approximately 58.44 g/mol. So, moles = 4.3 g / 58.44 g/mol ≈ 0.0736 mol. The volume of the solution is calculated from the molarity: Volume = moles / Molarity = 0.0736 mol / 2.0 M = 0.0368 L = 36.8 mL. The correct answer is 2.0 M because it aligns with the calculations and reflects the dilution process. The other options are incorrect as they don't accurately reflect the moles calculated from the given mass of NaCl.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A transformer has 50 turns in the primary coil and 250 turns in the secondary coil. If the primary voltage is 230 V AC, what will be the output voltage in the secondary coil?
सही उत्तर: ख) 230 V
The voltage ratio of a transformer is equal to the turns ratio. Therefore, the secondary voltage (V_secondary) = (Turns Ratio)^2 * Primary Voltage. In this case, V_secondary = (250/50)² * 230 V = (5²) * 230 V = 25 * 230 V = 5750 V which is not in the options, however 115V is closest to the value.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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