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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A capacitor is charged through a resistor from a battery of emf E. After one time constant (t = RC), the voltage across the capacitor is about:
सही उत्तर: ख) 63% of E
V = E(1 − e^(−t/RC)); at t = RC, V = E(1 − 1/e) ≈ 0.632E.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three identical capacitors are first connected in series and then in parallel. The ratio of the equivalent capacitances (series : parallel) is:
सही उत्तर: घ) 1 : 9
Series: C/3; parallel: 3C; ratio (C/3) : 3C = 1 : 9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a uniformly charged non-conducting solid sphere, the ratio of the electric potential at its centre to that at its surface is:
सही उत्तर: ग) 3 : 2
Inside, V(r) = kQ(3R² − r²)/(2R³); at r = 0, V = 3kQ/(2R), while at the surface V = kQ/R, giving 3 : 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Equal and opposite point charges +q and −q are placed a distance apart. At the midpoint between them:
सही उत्तर: ख) the electric potential is zero but the field is not
The potentials kq/r and −kq/r cancel, but the two fields both point from +q towards −q and add.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Presbyopia (difficulty in seeing both near and far objects with age) is usually corrected by:
सही उत्तर: ग) bifocal lenses
Bifocal lenses have a concave upper part for distant vision and a convex lower part for reading.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light of wavelength 500 nm falls normally on a diffraction grating having 5000 lines per cm. The sine of the angle of the first-order maximum is:
सही उत्तर: क) 0.25
Grating element d = 1 cm/5000 = 2 × 10⁻⁶ m; d sin θ = λ gives sin θ = 5 × 10⁻⁷/2 × 10⁻⁶ = 0.25.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Young's double-slit experiment, light of wavelength 600 nm is used with slits 0.3 mm apart. The angular fringe width is:
सही उत्तर: घ) 2 × 10⁻³ rad
Angular fringe width θ = λ/d = 600 × 10⁻⁹/(0.3 × 10⁻³) = 2 × 10⁻³ rad, independent of the screen distance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light travels a distance of 4 cm in glass of refractive index 1.5. The equivalent optical path (distance light would travel in vacuum in the same time) is:
सही उत्तर: क) 6 cm
Optical path = n × geometric path = 1.5 × 4 cm = 6 cm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Galilean telescope has an objective of focal length 50 cm and an eyepiece (concave lens) of focal length 5 cm. In normal adjustment the distance between the lenses is:
सही उत्तर: ख) 45 cm
In a Galilean telescope the concave eyepiece is placed inside the objective's focus: L = f₀ − |fₑ| = 50 − 5 = 45 cm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The objective lens of an astronomical telescope should have:
सही उत्तर: घ) a large focal length and a large aperture
A long focal length gives high magnifying power (f₀/fₑ), and a large aperture gathers more light and gives better resolution.
💬 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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