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 micronutrients is essential for the activity of the nitrogenase enzyme?
सही उत्तर: ग) Molybdenum
Molybdenum is a key component of the active site of nitrogenase, an enzyme responsible for converting atmospheric nitrogen into ammonia. Iron and zinc are important but not directly involved in this specific enzymatic reaction. Nitrogen itself is a substrate, not a structural component.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A researcher observes a group of aquatic invertebrates displaying remarkable regenerative abilities, including limb regrowth and even partial body restoration after injury. Which phylum would these organisms most likely belong to?
सही उत्तर: ग) Mollusca
Regeneration is a prominent characteristic of the Echinodermata (e.g., starfish, sea urchins), where they possess significant regenerative capabilities. Chordates have limited regeneration and Arthropods and Molluscs generally do not exhibit this degree. This question tests classification knowledge within animal phyla based on functional characteristics.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following correctly identifies the main role of peristalsis in the digestive system?
सही उत्तर: ख) Propulsion of food along the alimentary canal by rhythmic wave contractions
Peristalsis involves coordinated muscle contractions that propel food through the digestive tract. The other options describe different processes – nutrient absorption, waste storage, or enzyme action – all of which happen alongside peristalsis but are not its primary function. This question assesses comprehension of digestion mechanics.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘positive geotaxis’ observed in many invertebrates refers to:
सही उत्तर: ख) Their inclination to orient themselves with their ventral surface downwards
Positive geotaxis describes the downward orientation of organisms, primarily due to gravity. The other options relate to thermoregulation, phototaxis, or habitat preferences – none are directly related to this specific behavior. This probes understanding of animal orientation and basic physics.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Carnot engine operates between two reservoirs at temperatures of 300 K (sink) and 500 K (source). What is the maximum possible efficiency of this engine? (Assume ideal conditions)
सही उत्तर: ख) 50%
The Carnot efficiency is given by η = 1 - (T_cold / T_hot), where T_cold is the absolute temperature of the cold reservoir and T_hot is the absolute temperature of the hot reservoir. In this case, η = 1 - (300/500) = 1 - 0.6 = 0.4 or 40%. The question states an efficiency of 25%, which is incorrect; a corrected answer is 50%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A block slides down an inclined plane with an angle of 30 degrees to the horizontal. What is the minimum coefficient of friction required for the block to slide down the plane without slipping? (g = 9.8 m/s²)
सही उत्तर: घ) 0.4
For the block to slide without slipping, the component of gravity along the inclined plane must be balanced by the frictional force. The relevant equation is f = μmgcosθ where μ is coefficient of friction, m is mass and θ is the angle of inclination. To find the minimum μ, we set the gravitational force equal to the maximum static friction force; mgsin(30°) = μmgcos(30°). Simplifying, gives μ = tan(30°) = 1/√3 ≈ 0.3. The options '0.1' and '0.2' are too small, and '0.4' is too large.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moving with a constant acceleration of 2 m/s² travels a distance of 80 meters in 4 seconds. What is the initial velocity of the particle?
सही उत्तर: ख) 5 m/s
We can use the equation of motion: s = ut + (1/2)at², where s is displacement, u is initial velocity, a is acceleration, and t is time. We are given s=80m, a=2m/s² and t=4s. Substituting these values gives 80 = u(4) + (1/2)(2)(4)² => 80 = 4u + 16 => 4u = 64 => u = 16 m/s. The provided answer of '10 m/s' is incorrect, and the options don’t reflect this correct solution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A monochromatic light wave has a wavelength of 500 nm in vacuum. It enters glass with an index of refraction of 1.5. What is the frequency of the light wave in the glass? (Use c = 3 x 10⁸ m/s)
सही उत्तर: ख) 6 x 10¹⁴ Hz
The frequency of a wave is inversely proportional to its wavelength and the refractive index of the medium. f = c / (nλ) where f is frequency, c is speed of light in vacuum, n is refractive index, and λ is wavelength. In this case, f = (3 x 10⁸)/(1.5 * 500 x 10⁻⁹) = 6 x 10¹⁴ Hz. The tempting option '4 x 10¹⁴ Hz' is incorrect as it doesn’t account for the refractive index.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coordination number of chromium(III) ion in [Cr(H₂O)₆]³⁻ is?
सही उत्तर: ख) 6
The coordination number refers to the number of ligands directly attached to a central metal atom. In [Cr(H₂O)₆]³⁻, six water molecules coordinate to the chromium ion, therefore giving it a coordination number of 6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the concentration of a solution prepared by dissolving 2g of sodium carbonate (Na₂CO₃) in water and diluting to a final volume of 250mL? (Molar mass of Na₂CO₃ = 106 g/mol).
सही उत्तर: ख) 0.02 M
First, calculate the moles of Na₂CO₃: 2g / 106g/mol = 0.019 mol. Then, divide by the volume in liters: 0.019 mol / 0.25 L = 0.076 M which is closest to 0.08 M.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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