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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A ball bounces vertically from the ground with a velocity of 2 m/s after hitting the ground. If the restitution coefficient (e) is defined as the ratio of the final relative velocity to the initial relative velocity, what is the velocity of the ball just before it hits the ground?
सही उत्तर: घ) 4 m/s
The restitution coefficient 'e' is defined as (v_f / v_i)^2 where v_f and v_i are the final and initial relative velocities. The ball bounces back with the same velocity it had just before hitting the ground, therefore the answer is 2 m/s. 1 m/s is too low. 4 m/s would require e to be greater than 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cyclist takes a turn of radius 50 m at a speed of 15 m/s. The banking angle of the turn is θ. What is the minimum value of θ in degrees, assuming the coefficient of friction between the tires and the road surface is 0.7? (Take g = 9.8 m/s²)
सही उत्तर: ख) 45
The cyclist's centripetal force is provided by a component of gravity. F_c = mv²/r, where v is the speed and r is the radius. The banking angle allows for this component. The correct solution involves calculating the necessary force and then relating it to gsin(θ). The most tempting option (30 degrees) is incorrect because a smaller angle would require a higher coefficient of friction than given.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The percentage dissociation of a weak acid HA in water is 10%. If the initial concentration of HA is 0.1 M, what will be the equilibrium concentration of HA?
सही उत्तर: घ) 0.11 M
The percentage dissociation represents the fraction of the acid that dissociates (dissociated = dissociated). So 10% of 0.1M is 0.01M. The equilibrium concentration will be the initial concentration minus the amount that has dissociated, which equals 0.09M.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The solubility product constant, Ksp, for AgCl(s) is 1.8 × 10⁻¹⁰. If the concentration of Ag⁺ ions in a saturated solution is 2.4 × 10⁻⁸ M, what is the concentration of Cl⁻ ions in this saturated solution?
सही उत्तर: ख) 3.2 × 10⁻⁹ M
Ksp = [Ag⁺][Cl⁻]². Solving for [Cl⁻], we get [Cl⁻] = √(Ksp / [Ag⁺]²) = √((1.8 × 10⁻¹⁰) / (2.4 × 10⁻⁸)) ≈ 9.6 × 10⁻⁹ M. The other options do not correctly apply the Ksp equation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following sequences is an odd one out based on a numerical relationship?
सही उत्तर: क) 2–8, 3–27, 4–64, 5–120
The sequence '2-8' follows the pattern of squaring the number (2^2 = 4 is not present in the options). The rest of the sequences exhibit a simple progression of increasing squares (n^3). The other options represent increasing cubes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person turns left and then right. How many degrees did they rotate?
सही उत्तर: ख) 90
Turning left is -90 degrees and turning right is +90 degrees. Therefore, the total rotation is -90 + 90 = 0 degrees. The most tempting answer is 180 degrees but this includes the initial orientation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If ‘Red’ represents the number 1, ‘Green’ represents the number 2, and ‘Blue’ represents the number 3, what does ‘White’ represent?
सही उत्तर: घ) 4
The question uses a simple substitution code where each color corresponds to a numerical value. ‘Red’ is represented by 1, 'Green' by 2 and ‘Blue’ by 3. Thus, White which has no representation as such can be associated with the number 3, representing Blue, the only color in this set that is not already assigned.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A clock is ticking. After how many hours and minutes will the minute hand overtake the hour hand?
सही उत्तर: ख) 1 hour 30 minutes
The minute hand moves 360 degrees in 60 minutes, or 6 degrees per minute. The hour hand moves 360 degrees in 12 hours (720 minutes), or 0.5 degrees per minute. To overtake, the minute hand must gain 360 degrees on the hour hand. Solving for time: (6 - 0.5) * x = 360 => 5.5x = 360 => x = 360/5.5 ≈ 65.45 minutes, which is approximately 1 hour and 5 minutes. This option ('1 hour 15 minutes') is the closest approximation considering the rounding involved during calculation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The approximate molarity of a solution prepared by dissolving 4 g of sodium chloride (NaCl) in 500 mL of water is (Molar mass of NaCl = 102 g/mol).
सही उत्तर: ख) 2.0 M
The molarity calculation involves converting grams of solute to moles and then dividing by the volume in liters. NaClO's molar mass is 58.44 g/mol, not 102g/mol. 4g / 58.44 g/mol = 0.069 mol. Diluting this into 500 mL (0.5 L) gives 0.069 mol / 0.5 L = 0.138 M. Therefore, the correct answer is 2.0 M.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following best describes the function of the contractile ring during cell division in animal cells? (A) It facilitates chromosome segregation to opposite poles. (B) It synthesizes new DNA molecules required for replication. (C) It physically constricts the cell membrane during cytokinesis. (D) It provides energy for chromosome movement.
सही उत्तर: ख) (B) It synthesizes new DNA molecules required for replication.
The contractile ring is a belt of actin and myosin filaments that actively pinches the cell in two during cytokinesis (cell division), directly facilitating the separation of chromosomes into daughter cells. Options (B), (C), and (D) describe incorrect stages or mechanisms.
💬 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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