आईओई इन्जिनियरिङ प्रवेश (त्रिवि) BE / B.Arch प्रवेश परीक्षा तयारी
आईओई इन्जिनियरिङ प्रवेश (त्रिवि) – BE / B.Arch प्रवेश परीक्षा
IOE BE / B.Arch Entrance · IOE Entrance (TU)
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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In a photoelectric experiment, the frequency of the incident light is increased by 2.42 × 10¹⁴ Hz. The stopping potential increases by about (h = 6.63 × 10⁻³⁴ J s, e = 1.6 × 10⁻¹⁹ C):
सही उत्तर: ख) 1.0 V
eV₀ = hν − φ, so ΔV₀ = hΔν/e = (6.63 × 10⁻³⁴ × 2.42 × 10¹⁴)/(1.6 × 10⁻¹⁹) ≈ 1.0 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light travels from glass (n = 3/2) towards water (n = 4/3). The critical angle C for the glass–water boundary is given by:
सही उत्तर: ग) sin C = 8/9
sin C = n_rarer/n_denser = (4/3)/(3/2) = 8/9, so C ≈ 62.7°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire is stretched so that its length increases by 1% while its volume stays constant. Its resistance increases by about:
सही उत्तर: घ) 2%
With volume constant, A ∝ 1/L, so R = ρL/A ∝ L²; R'/R = (1.01)² ≈ 1.02, an increase of about 2%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 0.1 kg ball is projected at 20 m/s at 30° to the horizontal. Its angular momentum about the point of projection when it is at the highest point is about (g = 10 m/s²):
सही उत्तर: घ) 8.7 kg m²/s
At the top H = u² sin²θ/(2g) = 5 m and the velocity is horizontal, u cos θ = 17.32 m/s, so L = m(u cos θ)H = 0.1 × 17.32 × 5 ≈ 8.7 kg m²/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gamma rays originate from:
सही उत्तर: ग) transitions between energy levels of the nucleus
γ rays are emitted when an excited nucleus drops to a lower nuclear energy level.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an optical fibre, the refractive index of the core compared with that of the cladding is:
सही उत्तर: ख) higher
Total internal reflection at the core–cladding boundary needs light to go from a denser to a rarer medium, so the core has the higher refractive index.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The output of a two-input XNOR gate is 1 when:
सही उत्तर: क) both inputs are the same
XNOR is the complement of XOR; it gives 1 for inputs 00 and 11, i.e. whenever the inputs are equal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A transistor amplifier in CE mode has a current gain of 100 and a voltage gain of 500. Its power gain is:
सही उत्तर: घ) 50000
Power gain = current gain × voltage gain = 100 × 500 = 5 × 10⁴.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a centre-tap full-wave rectifier, if Vₘ is the peak voltage of each half of the secondary, the peak inverse voltage across each diode is:
सही उत्तर: क) 2Vₘ
When one diode conducts, the non-conducting diode has the whole secondary (2Vₘ) across it in reverse.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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²³⁸₉₂U emits two α particles and then one β⁻ particle. The resulting nucleus has:
सही उत्तर: ख) A = 230, Z = 89
Two α decays: A = 238 − 8 = 230, Z = 92 − 4 = 88; one β⁻ decay raises Z by 1 to 89 with A 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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