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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The normality of 0.5 M H₂SO₄ solution is:
सही उत्तर: क) 1 N
H₂SO₄ is dibasic (n-factor 2), so N = M × 2 = 1 N. Normality equals molarity only for monobasic acids like HCl.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The volume occupied by 2 g of hydrogen gas at STP (taking molar volume as 22.4 L) is:
सही उत्तर: ग) 22.4 L
2 g of H₂ is 1 mol (molar mass 2 g/mol), which occupies 22.4 L at STP. 44.8 L would result from wrongly taking the molar mass of H₂ as 1 g/mol.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A compound contains 40% C, 6.67% H and 53.3% O by mass. Its empirical formula is:
सही उत्तर: ख) CH₂O
Mole ratio C : H : O = 3.33 : 6.62 : 3.33 ≈ 1 : 2 : 1, giving CH₂O. Glucose and acetic acid both have this empirical formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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4 g of NaOH is dissolved in water to make 500 mL of solution. The molarity of the solution is:
सही उत्तर: ग) 0.2 M
Moles of NaOH = 4/40 = 0.1 mol; molarity = 0.1 mol / 0.5 L = 0.2 M. 0.1 M is the number of moles, obtained by forgetting to divide by the volume (0.5 L).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of water molecules present in 9 g of water is:
सही उत्तर: ग) 3.011 × 10²³
9 g of water is 9/18 = 0.5 mol, so it contains 0.5 × 6.022 × 10²³ = 3.011 × 10²³ molecules. 6.022 × 10²³ would correspond to a full mole (18 g).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Above the Curie temperature, a ferromagnetic substance becomes:
सही उत्तर: क) Paramagnetic
Thermal agitation destroys the alignment of magnetic domains above the Curie temperature, so the material behaves as paramagnetic. It does not become diamagnetic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coefficients of linear (α), superficial (β) and cubical (γ) expansion of a solid are related as:
सही उत्तर: घ) α : β : γ = 1 : 2 : 3
For isotropic solids β = 2α and γ = 3α, giving 1 : 2 : 3. This follows because area involves two dimensions and volume three.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the input AC frequency to a full-wave rectifier is 50 Hz, the frequency of the output ripple is:
सही उत्तर: ग) 100 Hz
A full-wave rectifier conducts in both halves of each cycle, so the output pulses occur at twice the input frequency. A half-wave rectifier's output frequency equals the input, 50 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Zener diode is commonly used as a:
सही उत्तर: ख) Voltage regulator
Operated in reverse breakdown, a Zener diode keeps the voltage across it nearly constant over a wide range of current. Ordinary p-n diodes are used as rectifiers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a p-n junction diode is forward biased, the width of the depletion layer:
सही उत्तर: क) Decreases
Forward bias opposes the barrier potential, pushing majority carriers into the junction and narrowing the depletion region. Reverse bias widens it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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