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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A particle moves along the x-axis with velocity v = (4t − 6) m/s. The distance (not displacement) it covers from t = 0 to t = 3 s is:
सही उत्तर: क) 9 m
v changes sign at t = 1.5 s. Distance = |∫₀^1.5 v dt| + ∫_1.5^3 v dt = 4.5 + 4.5 = 9 m (the displacement is 0).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the units of mass, length and time are each doubled, the new unit of energy is how many times the old one?
सही उत्तर: ग) 2
[E] = [M L² T⁻²]; the new unit is 2 × 2² × 2⁻² = 2 times the old unit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A screw gauge of least count 0.01 mm has a positive zero error of 3 divisions. A wire gives a main-scale reading of 3.5 mm and 24 circular-scale divisions. The corrected diameter is:
सही उत्तर: घ) 3.71 mm
Observed = 3.5 + 24 × 0.01 = 3.74 mm; subtracting the zero error (+0.03 mm) gives 3.71 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A quantity is calculated as X = a²b³/√c. If the percentage errors in a, b and c are 1%, 2% and 4% respectively, the maximum percentage error in X is:
सही उत्तर: ग) 10%
ΔX/X = 2(1%) + 3(2%) + ½(4%) = 2% + 6% + 2% = 10%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the error in measuring the side of a cube is 1%, the maximum percentage error in its calculated density (mass measured exactly) is:
सही उत्तर: ख) 3%
ρ = m/a³, so Δρ/ρ = 3(Δa/a) = 3 × 1% = 3%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of angular momentum is:
सही उत्तर: क) [M L² T⁻¹]
Angular momentum = mvr, so its dimensions are [M][L T⁻¹][L] = [M L² T⁻¹] (the same as Planck's constant).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A and B toss a fair coin alternately, A starting; whoever gets the first head wins. The probability that A wins is:
सही उत्तर: घ) 2/3
P(A) = 1/2 + (1/2)²(1/2) + … = (1/2)/(1 − 1/4) = 2/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A marksman hits a target with probability 1/3 per shot. In 4 independent shots, the probability of hitting the target at least once is:
सही उत्तर: ग) 65/81
P(at least one hit) = 1 − (2/3)⁴ = 1 − 16/81 = 65/81.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A family has two children. Given that at least one of them is a boy, the probability that both are boys is (boys and girls equally likely):
सही उत्तर: ख) 1/3
Sample space {BB, BG, GB, GG}; given at least one boy leaves {BB, BG, GB}, so P = 1/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three fair dice are thrown. The probability that the sum of the numbers shown is 4 is:
सही उत्तर: क) 1/72
Only the arrangements of (1, 1, 2) give a sum of 4: 3 outcomes out of 216, i.e. 3/216 = 1/72.
💬 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।