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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Two tuning forks of frequencies 256 Hz and 260 Hz are sounded together. The number of beats heard per second is:
सही उत्तर: घ) 4
Beat frequency = |f₁ − f₂| = 260 − 256 = 4 Hz. 516 is the sum, which does not give beats.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fundamental frequency of a pipe closed at one end, of length 0.5 m, is (speed of sound = 340 m/s):
सही उत्तर: ग) 170 Hz
For a closed pipe f = v/4L = 340/2 = 170 Hz. 340 Hz would be the fundamental of an open pipe of the same length (v/2L).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The speed of sound in an ideal gas does NOT depend on:
सही उत्तर: ख) Pressure (at constant temperature)
v = √(γP/ρ) = √(γRT/M); at constant temperature P/ρ stays constant, so changing pressure does not change v. Speed does depend on temperature (v ∝ √T), molar mass and γ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sound waves in air are:
सही उत्तर: क) Longitudinal mechanical waves
Sound travels in air as compressions and rarefactions, with particles vibrating along the direction of propagation. Being mechanical, it cannot travel through vacuum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio of the rms speeds of hydrogen (H₂) and oxygen (O₂) molecules at the same temperature is:
सही उत्तर: घ) 4 : 1
v_rms = √(3RT/M) ∝ 1/√M, so v(H₂)/v(O₂) = √(32/2) = 4. 16:1 is the ratio of the molar masses, not of the speeds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio of specific heats γ = Cp/Cv for a monatomic ideal gas is:
सही उत्तर: ग) 5/3
For a monatomic gas Cv = 3R/2 and Cp = 5R/2, giving γ = 5/3 ≈ 1.67. 7/5 applies to diatomic gases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Carnot engine works between a source at 500 K and a sink at 300 K. Its efficiency is:
सही उत्तर: ख) 40%
η = 1 − T₂/T₁ = 1 − 300/500 = 0.4 = 40%. 60% is the ratio T₂/T₁ itself.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an adiabatic process:
सही उत्तर: क) No heat is exchanged with the surroundings
Adiabatic means Q = 0, so ΔU = −W. Constant temperature, pressure and volume describe isothermal, isobaric and isochoric processes respectively.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an ideal gas undergoing an isothermal process, the change in internal energy is:
सही उत्तर: घ) Zero
The internal energy of an ideal gas depends only on temperature, which is constant here, so ΔU = 0 and all heat supplied becomes work. In an adiabatic process it is Q, not ΔU, that is zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the absolute temperature of a black body is doubled, the power radiated by it becomes:
सही उत्तर: ग) 16 times
By the Stefan–Boltzmann law, P ∝ T⁴, so P becomes 2⁴ = 16 times. 4 times would be the case if P ∝ T².
💬 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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