चिकित्सा शिक्षा आयोग (CEE) पारामेडिकल (B.Pharm, BPH, BMLT, BMIT, B.Optom) तयारी
चिकित्सा शिक्षा आयोग (CEE) – पारामेडिकल (B.Pharm, BPH, BMLT, BMIT, B.Optom)
Paramedical Bachelor 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 time taken by light to pass normally through a glass slab 3 cm thick (refractive index 1.5) is (c = 3 × 10⁸ m/s):
सही उत्तर: क) 1.5 × 10⁻¹⁰ s
Speed in glass = c/μ = 2 × 10⁸ m/s; t = 0.03/(2 × 10⁸) = 1.5 × 10⁻¹⁰ s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A source of sound of frequency 500 Hz moves towards a stationary observer with a speed equal to one-fifth of the speed of sound. The frequency heard is:
सही उत्तर: क) 625 Hz
f′ = f × v/(v − v_s) = 500 × v/(v − v/5) = 500 × 5/4 = 625 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pipe 0.5 m long is open at both ends. If the speed of sound is 340 m/s, the frequency of its second overtone is:
सही उत्तर: घ) 1020 Hz
For an open pipe all harmonics occur; the second overtone is the third harmonic, f = 3v/2L = 3 × 340/(2 × 0.5) = 1020 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wave is described by y = 0.1 sin(4πt − 0.02πx), where x and y are in cm and t is in s. The speed of the wave is:
सही उत्तर: क) 2 m/s
v = ω/k = 4π/(0.02π) = 200 cm/s = 2 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Carnot engine has an efficiency of 25% when its sink is at 27 °C. The temperature of its source is:
सही उत्तर: ग) 127 °C
η = 1 − T₂/T₁ gives 0.25 = 1 − 300/T₁, so T₁ = 400 K = 127 °C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cyclist takes a turn of radius 20 m at 10 m/s. The angle with the vertical at which he must lean inward is (g = 10 m/s²):
सही उत्तर: ख) about 27°
tanθ = v²/(rg) = 100/(20 × 10) = 0.5, so θ = tan⁻¹(0.5) ≈ 26.6°, about 27°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A monatomic ideal gas (γ = 5/3) at 27 °C is compressed adiabatically to 8/27 of its original volume. Its final temperature is:
सही उत्तर: घ) 675 K
TV^(γ−1) = constant: T₂ = 300 × (27/8)^(2/3) = 300 × 9/4 = 675 K.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The wavelength at which a black body radiates most strongly shifts from 500 nm to 250 nm. The total power radiated by it becomes:
सही उत्तर: घ) 16 times
By Wien's law λₘT = constant, so T doubles; by Stefan's law P ∝ T⁴, so power becomes 2⁴ = 16 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two rods of the same material have lengths in the ratio 1 : 2 and radii in the ratio 2 : 1. With the same temperature difference across their ends, the ratio of the rates of heat flow through them is:
सही उत्तर: ग) 8 : 1
Q/t = KAΔT/L ∝ r²/L, so the ratio = (2²/1) : (1²/2) = 4 : 1/2 = 8 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat required to raise the temperature of 0.5 kg of copper (specific heat 400 J kg⁻¹ K⁻¹) from 25 °C to 75 °C is:
सही उत्तर: क) 10 kJ
Q = mcΔT = 0.5 × 400 × 50 = 10000 J = 10 kJ.
💬 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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