मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
मेडिकल प्रवेश (CEE) – Physics, Chemistry, Zoology, Botany, MAT
Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · २,०३९ प्रश्न
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
CEE 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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4.6 g of sodium reacts completely with excess water (2Na + 2H₂O → 2NaOH + H₂). The volume of hydrogen liberated at STP is (Na = 23):
सही उत्तर: क) 2.24 L
4.6 g Na = 0.2 mol, which gives 0.1 mol H₂ = 0.1 × 22.4 = 2.24 L at STP.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of neutrons present in 18 g of water (made of ¹H and ¹⁶O only) is about (N_A = 6.022 × 10²³):
सही उत्तर: क) 4.8 × 10²⁴
18 g H₂O = 1 mol; each molecule has 0 + 0 + 8 = 8 neutrons, so neutrons = 8 × 6.022 × 10²³ ≈ 4.8 × 10²⁴.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ultraviolet lamps are used in hospitals and water-purification units mainly because UV radiation:
सही उत्तर: ख) kills bacteria and other microorganisms
Short-wavelength UV light damages the DNA of microorganisms, so it is used as a germicide for sterilising surfaces and water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Magnetic resonance imaging (MRI), used in hospitals, mainly uses:
सही उत्तर: क) a strong magnetic field and radio-frequency waves
MRI places the body in a strong magnetic field and uses radio-frequency pulses to detect signals from hydrogen nuclei; it uses no ionising radiation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bulb and an inductor coil are connected in series to an AC supply. If a soft-iron rod is slowly inserted into the coil, the bulb:
सही उत्तर: घ) becomes dimmer
The iron core increases the inductance and hence the reactance X_L = ωL, so the current through the bulb decreases and it glows dimmer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using Bohr's model with a₀ = 0.53 Å, the radius of the second orbit (n = 2) of the He⁺ ion is:
सही उत्तर: ग) 1.06 Å
rₙ = n²a₀/Z = 4 × 0.53/2 = 1.06 Å.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A straight wire of length L carrying current I is bent into a single circular loop. The magnetic dipole moment of the loop is:
सही उत्तर: ग) IL²/(4π)
2πr = L gives r = L/2π; m = IA = Iπr² = Iπ(L/2π)² = IL²/(4π).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When both inputs of a two-input NAND gate are joined together and used as a single input, the gate works as a:
सही उत्तर: घ) NOT gate
With A = B, the output is (A·A)′ = A′, which is the NOT operation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a plane electromagnetic wave in vacuum, the amplitude of the electric field is 300 V/m. The amplitude of the magnetic field is:
सही उत्तर: क) 1 × 10⁻⁶ T
B₀ = E₀/c = 300/(3 × 10⁸) = 1 × 10⁻⁶ T.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a transistor, the emitter current is 6.2 mA and the base current is 0.2 mA. The current gain β (= I_C/I_B) is:
सही उत्तर: क) 30
I_C = I_E − I_B = 6.2 − 0.2 = 6.0 mA; β = I_C/I_B = 6.0/0.2 = 30.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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