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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According to Huygens' principle, every point on a wavefront:
सही उत्तर: घ) acts as a source of secondary wavelets
Each point on a wavefront emits secondary wavelets; their forward envelope gives the new wavefront.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resolving power of a microscope can be increased by:
सही उत्तर: घ) using light of shorter wavelength
Resolving power of a microscope = 2n sin θ/λ, so a smaller λ (e.g. electrons, UV) gives better resolution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon that proves that light waves are transverse is:
सही उत्तर: क) polarisation
Only transverse waves can be polarised; interference and diffraction occur for longitudinal waves too.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two thin lenses of focal lengths f₁ and f₂ and dispersive powers ω₁ and ω₂ placed in contact form an achromatic doublet if:
सही उत्तर: ख) ω₁/f₁ + ω₂/f₂ = 0
The combined power's variation with colour vanishes when ω₁/f₁ + ω₂/f₂ = 0, which needs one convex and one concave lens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a ray passes through a prism at minimum deviation, the angles of refraction at the two faces are:
सही उत्तर: ग) equal, each A/2
At minimum deviation the ray passes symmetrically, so r₁ = r₂ and r₁ + r₂ = A gives r = A/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin convex glass lens (n = 1.5) is immersed in a transparent liquid of refractive index 1.5. The lens:
सही उत्तर: ग) behaves like a plane glass plate (infinite focal length)
By the lens-maker's formula 1/f ∝ (n_lens/n_medium − 1) = 0, so f is infinite and the lens becomes invisible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The brilliant sparkling of a cut diamond is mainly due to:
सही उत्तर: घ) total internal reflection
Diamond's high refractive index (about 2.42) gives a small critical angle (about 24°), so light undergoes repeated total internal reflection.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two musical instruments playing the same note at the same loudness can be distinguished by their:
सही उत्तर: क) quality (timbre)
Quality depends on the number and relative intensities of overtones present along with the fundamental.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stationary wave differs from a progressive wave in that it:
सही उत्तर: ख) does not transport energy along the medium
In a standing wave energy is trapped between nodes; there is no net flow of energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A sound has intensity 10⁻⁸ W/m². Taking the threshold intensity as 10⁻¹² W/m², its intensity level is:
सही उत्तर: ख) 40 dB
β = 10 log₁₀(I/I₀) = 10 log₁₀(10⁴) = 40 dB.
💬 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।