इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ 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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The quality factor (Q-factor) of a series LCR circuit is:
सही उत्तर: घ) (1/R)√(L/C)
Q = ω₀L/R with ω₀ = 1/√(LC), which gives Q = (1/R)√(L/C).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Soft iron is preferred for the cores of electromagnets because it has:
सही उत्तर: ख) high permeability and low retentivity
Soft iron magnetises strongly (high permeability) and loses its magnetism easily when the current stops (low retentivity and coercivity).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnetic field at the centre of a semicircular wire of radius r carrying a current I (the straight leads being radial) is:
सही उत्तर: ग) μ₀I/(4r)
A full loop gives μ₀I/(2r); a semicircle gives half of that, μ₀I/(4r), and radial leads contribute nothing at the centre.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer of resistance 99 Ω is to be shunted so that only 1% of the main current passes through it. The required shunt resistance is:
सही उत्तर: क) 1 Ω
I_g G = (I − I_g)S, so 0.01I × 99 = 0.99I × S, giving S = 1 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform wire of resistance R is bent into the shape of a square. The resistance between two adjacent corners is:
सही उत्तर: ख) 3R/16
Each side is R/4; between adjacent corners R/4 is in parallel with 3R/4, giving (R/4)(3R/4)/R = 3R/16.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire of resistance 10 Ω is cut into 5 equal parts, and the parts are connected in parallel. The equivalent resistance is:
सही उत्तर: घ) 0.4 Ω
Each part is 2 Ω; five of them in parallel give 2/5 = 0.4 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Four equal point charges q are placed at the four corners of a square. The electric field at the centre of the square is:
सही उत्तर: ख) zero
The fields due to charges at opposite corners are equal and opposite, so they cancel in pairs at the centre.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric dipole of moment p is in a uniform electric field E, initially aligned along the field. The work needed to rotate it through 180° is:
सही उत्तर: ख) 2pE
W = pE(cos 0° − cos 180°) = 2pE.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy stored per unit volume in an electric field E in vacuum is:
सही उत्तर: क) ½ε₀E²
Energy density of an electric field u = ½ε₀E².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electrostatic potential energy of a system of charges +1 μC and −1 μC placed 1 m apart in vacuum is (1/(4πε₀) = 9 × 10⁹ N m² C⁻²):
सही उत्तर: घ) −9 × 10⁻³ J
U = kq₁q₂/r = 9 × 10⁹ × (10⁻⁶)(−10⁻⁶)/1 = −9 × 10⁻³ J.
💬 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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