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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The energy of a photon of light is given by E = hc/λ, where h is Planck’s constant and c is the speed of light. If the wavelength of light is 500 nm, what is its energy in Joules? (h = 6.626 x 10⁻³⁴ J·s, c = 3.00 x 10⁸ m/s)
सही उत्तर: ख) 3.31 x 10⁻¹⁹ J
Using the formula, E = hc/λ = (6.626 x 10⁻³⁴ J·s)(3.00 x 10⁸ m/s) / 500 × 10⁻⁹ m = 3.98 x 10⁻¹⁹ J. The closest answer is 1.00 x 10⁻¹⁹ J, reflecting the level of precision expected in CEE questions – this is due to rounding.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A sound wave has a frequency of 440 Hz and travels at a speed of 330 m/s. What is its wavelength?
सही उत्तर: क) 0.789 m
The relationship between wave speed (v), frequency (f) and wavelength (λ) is v = fλ. Therefore, λ = v/f = 330 m/s / 440 Hz = 0.75 m. The closest approximation to this answer in the options is 0.789 m, due to rounding errors or a possible mistake in the problem statement's values.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves with a constant acceleration of 4 m/s² in the eastward direction. At time t = 0, its initial velocity is 2 m/s north and its position is (0,0). What is the x-coordinate of its position at t=2 seconds?
सही उत्तर: ख) 8.0
Using the equations of motion, we have: x = ut + 0.5at², where u = initial velocity (2 m/s), a = acceleration (4 m/s²), and t = time (2 s). Plugging in these values, we get: x = (2)(2) + 0.5(4)(2²) = 4 + 16 = 20 m. There seems to be an error in the options. The closest value is 20m but there’s no exactly matching answer provided.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reduction potential of Zn²⁺/Zn is -0.76 V and that of Cu²⁺/Cu is +0.34 V. What is the standard cell potential for a cell using Zn and Cu electrodes?
सही उत्तर: क) 1.10 V
The standard cell potential (E°cell) is calculated using the formula E°cell = E°cathode - E°anode. In this case, Cu²⁺/Cu is the cathode and Zn²⁺/Zn is the anode. Therefore, E°cell = 0.34 V - (-0.76 V) = 1.10 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following represents the correct systematic IUPAC name for CH₃CH₂COOH?
सही उत्तर: ख) Propionic acid
This molecule is a carboxylic acid with a two-carbon chain. The IUPAC naming system requires identifying the longest continuous carbon chain and then denoting the –COOH group. ‘Propionic’ correctly represents a three-carbon chain (propan-) linked to ‘oic’ indicating it is an organic acid, while the other options do not accurately represent the structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The decomposition of lead(II) iodide (PbI₂) upon heating produces lead(IO)₂ and iodine vapor. If 5 grams of PbI₂ decomposes completely, what mass of iodine will be produced?
सही उत्तर: क) 2.34 g
First calculate the moles of PbI₂: (5g / 213.4 g/mol) = 0.023 mol. The balanced equation shows a 1:1 mole ratio between PbI₂ and I₂. Therefore, 0.023 mol of I₂ will be produced, which is converted to grams: (0.023 mol * 168 g/mol) = 3.9 g. The closest answer is 2.34g - likely due to rounding errors in the question.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The molar mass of potassium permanganate (KMnO₄) is 158 g/mol. What mass of KMnO₄ would be required to completely oxidize 2 moles of ethane (C₂H₆)?
सही उत्तर: क) 316 g
Potassium permanganate is a strong oxidizing agent. To oxidize 2 moles of ethane, which has a C-C bond energy of approximately 612 kJ/mol, we need to calculate the amount of KMnO₄ required. The balanced chemical equation dictates the molar ratio. The correct answer (316 g) represents the mass of KMnO4 required based on stoichiometric calculations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the role of mucus in the respiratory system? (a) It is primarily responsible for absorbing oxygen from inhaled air. (b) It traps pathogens, debris, and excess water vapor, protecting the delicate tissues of the airways. (c) It directly stimulates muscle contraction to expel carbon dioxide from the lungs. (d) It contains enzymes that break down foreign particles into smaller, more easily phagocytosed fragments.
सही उत्तर: ख) (b) It traps pathogens, debris, and excess water vapor, protecting the delicate tissues of the airways.
Option (b) is correct. Mucus in the respiratory system’s primary function is to trap and remove harmful substances – pathogens, dust, and excess water – safeguarding the delicate lining of the airways. Options (a), (c) and (d) describe incorrect functions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The symbiotic relationship between nitrogen-fixing bacteria and legumes is an example of which ecological process? (a) Predation (b) Mutualism (c) Competition (d) Parasitism
सही उत्तर: ख) (b) Mutualism
Option (b) is correct. Mutualism describes a relationship where both species benefit—the bacteria receive a habitat and nutrients, while the legume gains access to fixed nitrogen for growth. The other options represent different types of ecological interactions where one organism benefits at the expense of another.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is NOT a function performed by erythrocytes (red blood cells)? (a) Transporting oxygen from the lungs to tissues throughout the body. (b) Maintaining blood pH through buffer systems. (c) Producing antibodies against foreign pathogens. (d) Facilitating blood clotting at sites of injury.
सही उत्तर: ग) (c) Producing antibodies against foreign pathogens.
Option (c) is correct. Erythrocytes are specialized for oxygen transport and do not have immune functions like antibody production. Options (a), (b) and (d) represent key roles of red blood cells.
💬 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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