चिकित्सा शिक्षा आयोग (CEE) बीडीएस प्रवेश परीक्षा तयारी
चिकित्सा शिक्षा आयोग (CEE) – बीडीएस प्रवेश परीक्षा
CEE – BDS 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 compounds contains a carbonyl group?
सही उत्तर: ग) C₃H₈O
A carbonyl group is a functional group characterized by a carbon atom double-bonded to an oxygen atom (C=O). C₃H₈O represents Acetone, which has this characteristic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a redox reaction, what does the oxidation number of an element change by?
सही उत्तर: ख) Decrease
During oxidation, an element loses electrons (increases its oxidation number), while during reduction, it gains electrons (decreases its oxidation number). The overall change reflects this process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pH of a solution is 6. What concentration of hydrogen ions (H⁺) exists in mol/L?
सही उत्तर: क) 10⁻⁵ mol/L
pH = -log[H⁺]. Solving for [H⁺], we get [H⁺] = 10⁻⁷ M. This is the same as 10⁻⁵ mol/L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rate constant of a chemical reaction is 2.5 x 10⁻³ s⁻¹ at 298 K. What is the order of the reaction with respect to its reactant?
सही उत्तर: क) 1
The rate law for a reaction is given by k = A[X]ⁿ, where k is the rate constant, [X] is the concentration of the reactant, and n is the order of the reaction. Solving for 'n' gives us n = 1/k. Therefore, the order of this reaction is 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molarity of a solution prepared by dissolving 3.6 grams of anhydrous CuSO₄ in 500 mL of water is approximately:
सही उत्तर: ख) 2.0 M
CuSO₄ has a molecular weight of 159.61 g/mol. 3.6 grams corresponds to 3.6 / 159.61 = 0.0223 moles. Diluting 0.0223 moles into 500 mL (0.5 L) results in a concentration of 0.0223 / 0.5 = 0.0446 M, which is closest to 0.04 M. The most tempting answer, 2.0M, arises from an incorrect calculation of the CuSO₄ mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the sequence is: RED, GRN, BLU, YEL, WHT, what is the next term in the sequence?
सही उत्तर: क) ORG
The sequence represents colors of the rainbow. The terms are listed alphabetically by color name (Red, Green, Blue, Yellow, White). Continuing the alphabetical pattern, the next color would be Orange (ORG).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A man is facing North. He turns 90 degrees to his right, then 180 degrees to his left, and finally 45 degrees to his right. In which direction is he now facing?
सही उत्तर: घ) North-East
Let's break down the turns: Initially facing North. Turning 90° right means facing East. Turning 180° left from East means facing West. Finally, turning 45° right from West means facing North-West. The answer that matches this direction is East.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A group of students are playing a game where each student needs to guess the number chosen by another student. If there are 5 students, and each student guesses the number chosen by exactly one other student, how many different pairs of students can be formed?
सही उत्तर: ख) 10
This is a combinatorics problem. We need to choose 2 students out of 5, where the order doesn't matter (since Student A guessing Student B is the same as Student B guessing Student A). The number of ways to do this is given by the combination formula: nCr = n! / (r!(n-r)!), so 5C2 = 5! / (2!3!) = (5*4) / (2*1) = 10. The most tempting answer, 30, arises from incorrectly considering all possible pairings without regard for the constraint that each student guesses only one other's number.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following statements regarding oxidation and reduction reactions is correct? (a) Oxidation always involves a loss of electrons, while reduction always involves a gain of electrons. (b) Oxidation always involves a gain of electrons, while reduction always involves a loss of electrons. (c) Oxidation can involve either a gain or loss of electrons, depending on the species involved. (d) Reduction always involves an increase in energy.
सही उत्तर: क) (a) Oxidation always involves a loss of electrons, while reduction always involves a gain of electrons.
Option (a) is correct. Oxidation is defined as the loss of electrons, and reduction is defined as the gain of electrons. Options (b) reverses this definition. Option (c) describes a more complex scenario, while (d) is factually incorrect about reduction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The haemolymph of a cockroach appears clear or pale yellow because:
सही उत्तर: ग) It has a low concentration of red blood cells and proteins
Cockroach haemolymph, unlike mammalian blood, does not contain hemoglobin. This absence results in a translucent appearance due to the lack of colored pigment that would scatter light. The other options describe incorrect explanations for colour changes in blood.
💬 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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