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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Which of the following values of electric charge can NOT exist on a body? (e = 1.6 × 10⁻¹⁹ C)
सही उत्तर: ख) 2.4 × 10⁻¹⁹ C
Charge is quantised (q = ne); 2.4 × 10⁻¹⁹ C would be 1.5e, which is not an integral multiple of e.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In single-slit Fraunhofer diffraction, the central maximum is:
सही उत्तर: क) twice as wide as each secondary maximum
The central maximum extends between the first minima on either side (angular width 2λ/a), twice that of the secondary maxima (λ/a).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an interference experiment the amplitudes of the two interfering waves are in the ratio 2 : 1. The ratio of the maximum to the minimum intensity in the pattern is:
सही उत्तर: क) 9 : 1
I_max : I_min = (a₁ + a₂)² : (a₁ − a₂)² = 9 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Astigmatism of the human eye is corrected by using:
सही उत्तर: क) cylindrical lenses
Astigmatism arises from unequal curvature of the cornea in different planes and is corrected with cylindrical lenses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin prism of angle 5° is made of glass of refractive index 1.5. The deviation it produces is:
सही उत्तर: क) 2.5°
For a thin prism δ = (μ − 1)A = 0.5 × 5° = 2.5°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is viewed normally through a glass slab 6 cm thick of refractive index 1.5. The apparent shift of the object is:
सही उत्तर: ख) 2 cm
Normal shift = t(1 − 1/μ) = 6(1 − 2/3) = 2 cm, towards the observer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin equi-convex lens of focal length f is cut into two identical plano-convex halves by a plane perpendicular to its principal axis. The focal length of each half is:
सही उत्तर: ग) 2f
Each half has only one curved surface, so its power is half that of the original lens and its focal length is 2f.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a convex lens of focal length f, the minimum possible distance between a real object and its real image is:
सही उत्तर: ख) 4f
The object–image separation u + v is least when u = v = 2f, giving 4f.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 20 cm in front of a convex mirror of focal length 20 cm. The image is formed:
सही उत्तर: ख) 10 cm behind the mirror
With u = −20 cm and f = +20 cm: 1/v = 1/f − 1/u = 1/20 + 1/20 = 1/10, so v = +10 cm (virtual, behind the mirror).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pipe open at both ends can produce:
सही उत्तर: ग) all harmonics, odd as well as even
An open pipe has antinodes at both ends, so it supports frequencies nv/2L for every integer n.
💬 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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