पोखरा र पूर्वाञ्चल विश्वविद्यालय PU / PoU BE प्रवेश तयारी
पोखरा र पूर्वाञ्चल विश्वविद्यालय – PU / PoU BE प्रवेश
PU BE Entrance · Pokhara & Purbanchal University BE
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
BE/B.Arch 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 moles of an ideal gas at 300 K occupy 0.05 m³. Its pressure is about (R = 8.314 J mol⁻¹ K⁻¹):
सही उत्तर: ख) 1.0 × 10⁵ Pa
P = nRT/V = 2 × 8.314 × 300/0.05 ≈ 9.98 × 10⁴ Pa ≈ 1.0 × 10⁵ Pa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Dalton's law of partial pressures, the total pressure of a mixture of non-reacting ideal gases is:
सही उत्तर: ग) the sum of the partial pressures of the component gases
Each gas exerts the pressure it would exert alone in the whole volume, and these partial pressures add up.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gas has a volume of 300 mL at 27 °C. At constant pressure it is heated to 127 °C. Its new volume is:
सही उत्तर: क) 400 mL
By Charles' law V ∝ T: V₂ = 300 × 400 K/300 K = 400 mL.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gas occupying 6 L at a pressure of 1 atm is compressed isothermally to 2 L. Its new pressure is:
सही उत्तर: ग) 3 atm
By Boyle's law P₁V₁ = P₂V₂: P₂ = 1 × 6/2 = 3 atm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the Dulong–Petit law, the molar specific heat of most solid elements at room temperature is about:
सही उत्तर: ग) 3R (≈ 25 J mol⁻¹ K⁻¹)
Each atom in a solid behaves like a 3-D oscillator with energy 3kT, giving a molar heat capacity of 3R.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A copper calorimeter of mass 200 g has a specific heat of 0.09 cal g⁻¹ °C⁻¹. Its water equivalent is:
सही उत्तर: घ) 18 g
Water equivalent = mass × specific heat/(specific heat of water) = 200 × 0.09/1 = 18 g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When the temperature of a gas is raised, its coefficient of viscosity:
सही उत्तर: घ) increases
Gas viscosity comes from momentum transfer by molecules moving between layers; faster molecules at higher temperature transfer more momentum, so η increases (unlike liquids).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The swing (curved path) of a spinning ball moving through air is explained by the:
सही उत्तर: ख) Magnus effect
Spin makes the air move faster on one side of the ball, lowering the pressure there (Bernoulli's principle), so a sideways force deflects the ball: the Magnus effect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A steel ball of radius 1 mm falls through a liquid of viscosity 1 Pa s. If the density of steel exceeds that of the liquid by 7000 kg/m³, its terminal velocity is about (g = 10 m/s²):
सही उत्तर: ख) 1.6 cm/s
v = 2r²(ρ − σ)g/(9η) = 2 × 10⁻⁶ × 7000 × 10/9 ≈ 0.0156 m/s ≈ 1.6 cm/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ice cube floats in a glass filled to the brim with water. When the ice melts completely, the water level:
सही उत्तर: ख) remains the same
Floating ice displaces its own weight of water; on melting it becomes exactly that volume of water, so the level is unchanged.
💬 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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