चिकित्सा शिक्षा आयोग (CEE) एमबीबीएस प्रवेश परीक्षा तयारी
चिकित्सा शिक्षा आयोग (CEE) – एमबीबीएस प्रवेश परीक्षा
CEE – MBBS 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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'Normal saline' administered intravenously is approximately isotonic with blood. What is the approximate molar concentration of NaCl solution typically used for normal saline?
सही उत्तर: ग) 3.0 M
Standard intravenous saline solutions are prepared at a 0.9% (w/v) concentration of NaCl, which is approximately equal to 0.9 M. This isotonicity helps maintain fluid balance in the bloodstream. Other concentrations would either be hypertonic or hypotonic, disrupting cellular function.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 25 mL solution of 0.1 M oxalic acid (H₂C₂O₄) is titrated with 0.02 M potassium permanganate (KMnO₄) in acidic medium. What volume of KMnO₄ is required for the complete neutralization?
सही उत्तर: ग) 10 ml
The balanced equation shows a 1:1 mole ratio between oxalic acid and permanganate. Using stoichiometry, the volume of KMnO₄ needed to react completely with 25 mL of 0.1 M H₂C₂O₄ is calculated as (25/100) * 0.02 = 0.05 L or 5 ml. The other options arise from incorrect application of stoichiometry.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the chemical formula for aspirin?
सही उत्तर: ख) CₙH₅COOH
Aspirin is chemically known as acetylsalicylic acid. This formula accurately represents the structure where salicylic acid has been reacted with acetic anhydride to form an ester bond. The other options represent incorrect chemical structures of related compounds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is launched with an initial velocity v at an angle θ above the horizontal. What is the magnitude of its horizontal component of velocity?
सही उत्तर: क) v cos(θ)
The horizontal component of the initial velocity (vx) is given by vx = v cos(θ). The vertical component is v sin(θ). The other options represent incorrect calculations based on different components.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wave travels along a stretched string with a length L and is reflected by a fixed end. If the wavelength of the incident wave is λ, what is the wavelength of the reflected wave?
सही उत्तर: ख) 2λ
When a wave reflects off a fixed end, it undergoes an inversion (a phase change). This means that the reflected wave has the same amplitude but its wavelength is twice the original wavelength (2λ). The other options represent incorrect interpretations of reflection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy of a photon is given by E = hf, where h is Planck's constant and f is the frequency. If a photon has a frequency of 10¹⁵ Hz, what will be its energy in Joules?
सही उत्तर: क) 1.24 x 10⁻¹⁹ J
Using the formula E = hf, where h = 6.626 x 10⁻³⁴ Js and f = 10¹⁵ Hz, we get: E = (6.626 x 10⁻³⁴ Js) * (10¹⁵ Hz) = 6.626 x 10² J. However, the given options are incorrect; the actual calculated value will differ significantly, so this question assesses understanding of the formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A block of mass 2 kg slides down a frictionless inclined plane of angle 30 degrees. What will be its acceleration?
सही उत्तर: ख) g/3
Using Newton's second law (ΣF = ma), the component of gravity acting along the incline is F = mg sin(θ). Therefore, a = F/m = (mg sin(θ))/m = g sin(θ) = 9.8 m/s² * sin(30°) = 4.9 m/s². The other options are incorrect calculations.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged particle moves through a uniform magnetic field perpendicular to the field. Which of the following statements regarding its motion is correct?
सही उत्तर: ख) It will move with constant velocity in a straight line
The force on a charged particle moving in a magnetic field (F = qvB, where v is the velocity and B is the magnetic field) is always perpendicular to both the velocity and the magnetic field. This results in uniform circular motion. The other options are incorrect as they violate this fundamental principle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A metal rod has a resistance of 10 ohms at 20 degrees Celsius. If the temperature coefficient of resistance for the metal is 0.0035 per degree Celsius, what will be the resistance of the rod at 80 degrees Celsius?
सही उत्तर: ख) 20 Ω
The change in resistance (ΔR) is given by R(T₂) - R₁ = αR₁ΔT, where R₁ is the initial resistance, T₁ is the initial temperature, R₂ is the final resistance, and T₂ is the final temperature. Here R₁=10, T₁=20, T₂=80, and α=0.0035. So ΔR = 0.0035 * 10 * (80-20) = 1.4 Ω. Thus R₂ = R₁ + ΔR = 10 + 1.4 = 11.4 ohms, closest to 16.84Ω in this case.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light ray is incident on a semi-circular glass surface of radius 10 cm with refractive index 1.5 at an angle of incidence of 30 degrees. What is the angle of refraction?
सही उत्तर: घ) 90°
Using Snell's Law (n₁sinθ₁ = n₂sinθ₂), where n₁=1 and θ₁=30°, we have sinθ₂ = (1.5)sin(30°) = 0.75. Therefore, θ₂ = arcsin(0.75) ≈ 48.2°, which is closest to 60°. The choices of 30° and 40° are incorrect because they use the wrong refractive index or don't apply Snell’s law correctly.
💬 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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