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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Which of the following statements best describes the process of oxidation in organic chemistry?
सही उत्तर: घ) D. Loss of electrons by an atom or molecule.
The correct answer is D. Oxidation in organic chemistry specifically refers to the loss of electrons – typically represented by the gain of oxygen or loss of hydrogen – resulting in an increase in the oxidation state of a carbon atom. Option A describes reduction; option B is incorrect because oxygen isn't gained, and option C incorrectly associates with reduction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dissolution of ammonium chloride (NH₄Cl) in water results in a decrease in pH. What is the primary reason for this change?
सही उत्तर: ख) B. The hydrolysis of ammonium ions (NH₄⁺).
The correct answer is B. Ammonium chloride is a salt that undergoes hydrolysis in water, producing H⁺ ions and increasing the acidity of the solution, thus lowering the pH. Option A is incorrect because ammonia doesn't directly cause acidification; option C is entirely false as HCl does not form from this reaction, and option D describes ion concentration changes, but not the mechanism behind the pH decrease.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The potential difference across a capacitor is doubled. Assuming the capacitance remains constant, what happens to the charge on the capacitor? (a) It remains unchanged (b) It is halved (c) It is doubled (d) It is quadrupled
सही उत्तर: ग) It is doubled
According to the equation Q = CV (where Q is charge, C is capacitance, and V is potential difference), if V doubles and C stays the same, then Q must also double.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A transformer has 100 turns in the primary coil and 200 turns in the secondary coil. If the voltage of the primary coil is reduced from 220 V to 110 V, the voltage of the secondary coil will be: (a) 110 V (b) 220 V (c) 440 V (d) 550 V
सही उत्तर: क) 110 V
Transformers operate on the principle of electromagnetic induction. The ratio of turns is inversely proportional to the ratio of voltages. Therefore, if the primary voltage decreases by a factor of 2, the secondary voltage also decreases by a factor of 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle of mass m is attached to a fixed wall by a rope of length l, with the rope making an angle θ with the vertical. The tension in the rope is: (a) mg (b) mlg cosθ (c) mlg sinθ (d) 0
सही उत्तर: घ) 0
The forces acting on the particle are tension in the rope and the wall's normal force. Since the rope is tangent to the circle, the tension provides the centripetal force. Therefore, the tension is mlg sinθ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The kinetic energy of a simple harmonic oscillator at its mean position is: (a) Zero (b) Equal to the potential energy (c) Maximum (d) Half of the potential energy
सही उत्तर: क) Zero
At the mean position, all the oscillator’s energy is stored as potential energy. Options (b), (c) and (d) describe a point where kinetic energy is present; therefore, zero represents the correct answer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly describes the role of the thyroid gland in regulating metabolism? (a) It primarily produces melatonin, which regulates sleep patterns. (b) It secretes hormones like thyroxine (T4) and triiodothyronine (T3), which increase metabolic rate. (c) It controls blood glucose levels through insulin production. (d) It synthesizes red blood cells in the bone marrow.
सही उत्तर: ख) (b) It secretes hormones like thyroxine (T4) and triiodothyronine (T3), which increase metabolic rate.
The thyroid gland is known for its role in regulating metabolism by producing hormones like T4 and T3, which stimulate cellular activity and increase metabolic rate. The other options describe functions of different endocrine glands or tissues.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of osmosis involves the movement of water across a semi-permeable membrane. Which statement best describes this movement? (a) Water moves from an area of high solute concentration to low solute concentration. (b) Water moves from an area of low solute concentration to high solute concentration. (c) Water molecules are randomly distributed on both sides of the membrane. (d) The movement of water is halted by the semi-permeable membrane.
सही उत्तर: ग) (c) Water molecules are randomly distributed on both sides of the membrane.
Osmosis describes the directional movement of water across a membrane from an area of *low* solute concentration to an area of *high* solute concentration. This movement aims to equalize the concentration on both sides.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following cell types is primarily responsible for the synthesis of insulin in the human body? (a) Osteoblasts (b) Pancreatic beta cells (c) Erythrocytes (d) Melanocytes
सही उत्तर: ख) (b) Pancreatic beta cells
Pancreatic beta cells are specialized endocrine cells within the islets of Langerhans in the pancreas that produce and secrete insulin. The other options represent different cell types with distinct functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of respiration in mammals involves the exchange of gases between the cells and the environment. Which of the following statements accurately describes this exchange? (a) Oxygen is primarily released into the alveoli, while carbon dioxide is absorbed. (b) Carbon dioxide is primarily released into the alveoli, while oxygen is absorbed. (c) Both oxygen and carbon dioxide are simultaneously exchanged between the alveoli and blood capillaries. (d) The exchange of gases occurs only in the mitochondria of cells.
सही उत्तर: ख) (b) Carbon dioxide is primarily released into the alveoli, while oxygen is absorbed.
Option (a) correctly describes the primary mechanism of gas exchange at the lungs - oxygen moves from the alveoli into the bloodstream, and carbon dioxide moves from the blood into the alveoli. Options (b) and (d) present reversed or incorrect processes. Option (c) is partially true but doesn't capture the distinct directional flow.
💬 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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