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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Water rises to a height h in a capillary tube on the Earth. In the same tube on the Moon (g one-sixth that on the Earth), it would rise to:
सही उत्तर: ख) 6h
h = 2T cos θ/(rρg) ∝ 1/g, so the height becomes 6h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The time period of a simple pendulum whose length equals the radius of the Earth (R = 6.4 × 10⁶ m, g = 9.8 m/s²) is about:
सही उत्तर: ख) 1 hour
For a long pendulum T = 2π√(1/(g(1/l + 1/R))); with l = R, T = 2π√(R/2g) ≈ 3590 s ≈ 60 min.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At what height above the Earth's surface does the acceleration due to gravity become one-ninth of its surface value? (R = radius of the Earth)
सही उत्तर: ग) 2R
g′ = g R²/(R + h)² = g/9 gives R + h = 3R, so h = 2R.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is launched with speed u at the angle that gives it the maximum horizontal range on level ground. The maximum height it reaches is:
सही उत्तर: घ) u²/(4g)
Maximum range needs θ = 45°, so H = u² sin²45°/(2g) = u²/(4g), one quarter of the range u²/g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a thin hollow sphere of mass M and radius R about a tangent is:
सही उत्तर: क) 5MR²/3
By the parallel axes theorem: I = (2/3)MR² + MR² = (5/3)MR².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward at 15 m/s from the top of a 20 m high tower. It hits the ground after (g = 10 m/s²):
सही उत्तर: क) 4 s
Taking up as positive: −20 = 15t − 5t², i.e. t² − 3t − 4 = 0, giving t = 4 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Alkali metals such as caesium are used in photocells for visible light mainly because they have:
सही उत्तर: ख) low work functions
Their low work functions (about 2 eV) let visible photons eject electrons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Microwaves are well suited for radar because they:
सही उत्तर: ग) have short wavelengths and can be sent as narrow beams
Short wavelengths (cm range) allow directional beams and good reflection from objects such as aircraft.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ozone layer protects life on Earth mainly by absorbing:
सही उत्तर: घ) ultraviolet radiation
Ozone strongly absorbs harmful UV radiation from the Sun.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solar cell generates an emf by the:
सही उत्तर: घ) photovoltaic effect at a p–n junction without external bias
Light creates electron–hole pairs near the junction; the built-in field separates them, producing an emf.
💬 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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