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 artificial sweetener aspartame is used only in cold foods and drinks because it: (a) Degrades rapidly at high temperatures. (b) Increases in sweetness at elevated temperatures. (c) Forms a stable complex with proteins. (d) Reacts violently with acidic solutions.
सही उत्तर: ख) (b) Increases in sweetness at elevated temperatures.
Aspartame is thermally unstable and decomposes significantly when heated. This is why it’s predominantly used in cold foods and beverages where rapid degradation isn't a major concern.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of converting a liquid into gas at a temperature below its boiling point is called:
सही उत्तर: घ) D. Liquefaction
Option 3, Vaporization, correctly describes the transition from a liquid to a gaseous state without reaching the boiling point. Condensation is the reverse process. Sublimation involves solid-to-gas conversion, and Liquefaction represents the opposite – gas to liquid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rate of reaction between hydrochloric acid (HCl) and sodium carbonate (Na₂CO₃) increases when the concentration of either reactant is increased. This is because the rate of reaction depends on the collision frequency of the reactant molecules. What is the primary reason for this dependence?
सही उत्तर: ग) C. Higher concentrations lead to more frequent collisions between HCl and Na₂CO₃ molecules, increasing the probability of a successful reaction.
Option C is correct because it accurately describes how reaction rates are affected by reactant concentration – increased concentration leads to increased collision frequency. Option A is incorrect as temperature effects are not directly linked to collision frequency in this case. Option B misrepresents the reaction mechanism; while bimolecular reactions exist, this simple acid-base reaction doesn’t necessarily require that specific mechanism. Option D suggests a non-existent intrinsic reactivity difference.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A beam of light is incident on a convex lens of focal length +20 cm, and forms an image at infinity. What is the distance between the object and the lens?
सही उत्तर: क) 10 cm
For a convex lens to form a virtual image at infinity, the object must be placed at infinity. This means that the image distance (v) is at infinity. Using the lens formula: 1/f = 1/u + 1/v. Since v = ∞ , we have 1/f = 1/u which implies u = f. Thus, the distance between the object and the lens is 20cm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A block of mass 5 kg slides down a rough inclined plane with an angle of 30 degrees. If the coefficient of friction between the block and the plane is 0.2, what is the acceleration of the block down the incline? (g = 9.8 m/s²)
सही उत्तर: क) 1.43 m/s²
The acceleration can be calculated using Newton's second law: ΣF = ma. The forces acting on the block are gravity and friction. The correct answer is 1.43m/s², accounting for both gravitational force (mgsinθ) and frictional force (μmgcosθ). Option 2.50 m/s² is incorrect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform magnetic field of 0.5 Tesla is applied perpendicular to the plane of motion of a charged particle with charge 2 x 10⁻⁸ C and mass 10⁻³ kg. What force does this magnetic field exert on the particle? (Use F = qvB sinθ, where θ is the angle between v and B)
सही उत्तर: क) 0.5 N
The force exerted on the charged particle is given by the formula F = qvBsin(θ). In this case, q = 2 x 10⁻⁸ C, v = (unknown), B = 0.5 T, and θ is assumed to be 90 degrees since the velocity and magnetic field are perpendicular. The force exerted will be 1N. The incorrect options don't correctly apply this formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer is converted into an ammeter by connecting: (a) A resistor in series (b) A shunt in parallel (c) A resistance in parallel (d) A capacitor in series
सही उत्तर: ख) (b) A shunt in parallel
An ammeter has a low resistance to minimize the effect of its own resistance on the current being measured. To convert a galvanometer into an ammeter, a *shunt* (a resistor with very low resistance) is connected in parallel. This allows most of the current to flow through the shunt, reducing the impact of the galvanometer’s internal resistance. Option (a) uses a series resistor which would increase the total resistance and diminish the current being measured.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If ‘RAIN’ means ‘7215’, then what does ‘SUN’ mean?
सही उत्तर: ख) 7901
This is a simple substitution cipher. We are given that RAIN = 7215. We need to find the code for SUN. S corresponds to 8, U corresponds to 9 and N corresponds to 01 (or 1). Thus, SUN = 8901.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If ‘BOOK’ is coded as ‘MPGH’, then how would ‘READ’ be coded?
सही उत्तर: क) TQRS
This question relies on a simple alphabetical shift. Each letter in 'BOOK' has been shifted forward by 5 positions in the alphabet (B->M, O->P, etc.). Applying the same logic to ‘READ’, we get R->T, E->Q, A->S, D->U, resulting in TQSU.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon of ‘geitonogamy’ involves pollination between flowers that are:
सही उत्तर: ग) Adjacent to each other
Geitonogamy refers to pollen transfer between flowers growing on the same plant but without physical contact. This is a type of cross-pollination. The options describing self pollination, or pollination from separate plants are incorrect.
💬 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।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।