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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If the distance between two point masses is tripled, the gravitational force between them becomes:
सही उत्तर: ख) 1/9 of the original
F ∝ 1/r², so tripling r reduces F to 1/9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The centre of mass of a thin uniform semicircular ring (wire) of radius R lies on its symmetry axis at a distance from the centre equal to:
सही उत्तर: क) 2R/π
For a semicircular wire, y_cm = (1/πR)∫R sin θ · R dθ from 0 to π = 2R/π; 4R/3π is for a semicircular disc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body rotating freely changes its moment of inertia to half its value while its angular momentum stays constant. Its rotational kinetic energy becomes:
सही उत्तर: घ) double
K = L²/(2I); with L constant, halving I doubles K.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wheel with moment of inertia 2 kg m² rotates at 3 rad/s. Its rotational kinetic energy is:
सही उत्तर: ग) 9 J
K = ½Iω² = ½ × 2 × 9 = 9 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solid cylinder rolls down from rest without slipping through a vertical height h. Its speed at the bottom is:
सही उत्तर: ख) √(4gh/3)
mgh = ½mv²(1 + k²/R²) with k²/R² = ½ for a solid cylinder, so v² = 4gh/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rate of change of angular momentum of a body is equal to the:
सही उत्तर: क) external torque acting on it
τ = dL/dt is the rotational analogue of F = dp/dt.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the theorem of parallel axes, the moment of inertia about an axis parallel to one through the centre of mass at distance d is:
सही उत्तर: घ) I_cm + Md²
The parallel axes theorem states I = I_cm + Md², where I_cm is about the parallel axis through the centre of mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a uniform circular disc of mass M and radius R about one of its diameters is:
सही उत्तर: ग) MR²/4
About the central perpendicular axis I = MR²/2; by the perpendicular axes theorem, about a diameter I = (MR²/2)/2 = MR²/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the extension of a spring is doubled, the elastic potential energy stored in it becomes:
सही उत्तर: ख) four times
U = ½kx², so doubling x makes U four times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pump lifts 600 kg of water through a height of 10 m in 1 minute. The power of the pump is (g = 10 m/s²):
सही उत्तर: क) 1 kW
P = mgh/t = 600 × 10 × 10/60 = 1000 W = 1 kW.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।