काठमाडौं विश्वविद्यालय KUUMAT / KU CBT तयारी
काठमाडौं विश्वविद्यालय – KUUMAT / KU CBT
KUUMAT / KU CBT · Kathmandu University (KUUMAT / KU CBT)
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 are heated at constant pressure from 300 K to 400 K. The work done by the gas is about (R = 8.314 J mol⁻¹ K⁻¹):
सही उत्तर: क) 1663 J
At constant pressure W = PΔV = nRΔT = 2 × 8.314 × 100 ≈ 1663 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Carnot engine with its source at 500 K has an efficiency of 40%. The temperature of its sink is:
सही उत्तर: ख) 300 K
η = 1 − T₂/T₁ gives T₂ = 500 × 0.6 = 300 K.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A steel rail 20 m long (α = 1.2 × 10⁻⁵ K⁻¹) is heated through 40 K. Its increase in length is:
सही उत्तर: ख) 9.6 mm
ΔL = LαΔT = 20 × 1.2 × 10⁻⁵ × 40 = 9.6 × 10⁻³ m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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100 g of ice at 0 °C is mixed with 100 g of water at 100 °C. Neglecting losses, the final temperature is (L = 80 cal/g, c = 1 cal/g °C):
सही उत्तर: क) 10 °C
Heat from water cooling to 0 °C = 10000 cal; melting needs 8000 cal; the remaining 2000 cal warms 200 g by 10 °C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A liquid drop of radius R (surface tension T) is split into 1000 identical droplets. The work done is:
सही उत्तर: घ) 36πR²T
Each droplet has radius R/10; new area = 1000 × 4π(R/10)² = 40πR², so the increase is 36πR² and W = 36πR²T.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wooden block of volume 1000 cm³ and density 0.6 g/cm³ floats in water. The additional mass that must be placed on it to just submerge it completely is:
सही उत्तर: ग) 400 g
Full buoyancy = 1000 g-wt, block weight = 600 g-wt, so an extra 400 g is needed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire of cross-section 2 mm² supports a load of 20 kg. The stress in it is (g = 10 m/s²):
सही उत्तर: ग) 10⁸ N/m²
Stress = F/A = 200/(2 × 10⁻⁶) = 10⁸ N/m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A spring of force constant k is cut into three equal parts, and two of the parts are joined in parallel. The force constant of the combination is:
सही उत्तर: क) 6k
Each third has constant 3k (k ∝ 1/length); two in parallel give 3k + 3k = 6k.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle in SHM has amplitude 0.05 m and angular frequency 10 rad/s. The magnitude of its acceleration at an extreme position is:
सही उत्तर: घ) 5 m/s²
a_max = ω²A = 100 × 0.05 = 5 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A seconds pendulum (period 2 s) at a place where g = 9.8 m/s² has a length of about:
सही उत्तर: ख) 0.99 m
L = gT²/4π² = 9.8 × 4/39.5 ≈ 0.99 m.
💬 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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AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।