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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Two coherent light waves, each of intensity I₀, superpose. The maximum resultant intensity is:
सही उत्तर: ग) 4I₀
Amplitudes add at a maximum: (2a)² = 4a², so I_max = 4I₀ (for incoherent sources the intensities simply add to 2I₀).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The wavefront of light from a point source at a finite distance is:
सही उत्तर: ग) spherical
Light spreads equally in all directions from a point source, so points of equal phase lie on spheres centred on the source.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Red light is used for danger signals mainly because red light:
सही उत्तर: घ) is scattered least by the atmosphere
Rayleigh scattering varies as 1/λ⁴, so long-wavelength red light is scattered least and remains visible from far away through fog and dust.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A right-angled isosceles glass prism is used to turn a ray through 90° by total internal reflection at its hypotenuse (angle of incidence 45°). The refractive index of the glass must be greater than:
सही उत्तर: क) √2
TIR needs 45° > critical angle C, i.e. sin C = 1/n < sin 45° = 1/√2, so n > √2 ≈ 1.414.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The minimum length of a vertical plane mirror in which a person of height h can see his full image is:
सही उत्तर: ख) h/2
Rays from the head and feet reach the eye after reflection at points midway in height, so the mirror needs to be only half the person's height.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The end correction at the open end of a pipe of internal diameter 4 cm is about:
सही उत्तर: ख) 1.2 cm
The end correction e ≈ 0.6r = 0.3d = 0.3 × 4 cm = 1.2 cm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a prong of a tuning fork is filed (a little metal removed from its end), its frequency:
सही उत्तर: ग) increases
Filing the prong reduces its effective mass, so it vibrates faster and the frequency increases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the wave y = 0.02 sin(100πt − 2πx) (SI units), the maximum speed of a particle of the medium is about:
सही उत्तर: घ) 6.28 m/s
Particle velocity amplitude = Aω = 0.02 × 100π = 2π ≈ 6.28 m/s (the wave speed is ω/k = 50 m/s).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an ideal gas, the pressure P is related to the total translational kinetic energy per unit volume E by:
सही उत्तर: क) P = (2/3)E
P = (1/3)ρv²_rms and E = (1/2)ρv²_rms, so P = (2/3)E.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At the same temperature, the ratio of the rms speed of hydrogen molecules to that of oxygen molecules is:
सही उत्तर: घ) 4 : 1
v_rms = √(3RT/M) ∝ 1/√M, so v_H₂/v_O₂ = √(32/2) = 4.
💬 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।
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