आईओई इन्जिनियरिङ प्रवेश (त्रिवि) M.Sc. इन्जिनियरिङ प्रवेश तयारी
आईओई इन्जिनियरिङ प्रवेश (त्रिवि) – M.Sc. इन्जिनियरिङ प्रवेश
IOE M.Sc. Engineering 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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The angle between the geographic meridian and the magnetic meridian at a place is called the:
सही उत्तर: क) angle of declination
Declination measures how far a compass needle deviates from true north; dip is the angle the Earth's field makes with the horizontal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnetic field at the centre of a circular arc of radius r that subtends an angle θ (radians) at the centre and carries current I is:
सही उत्तर: घ) μ₀Iθ/(4πr)
From the Biot–Savart law each element contributes μ₀I dl/(4πr²); summing over arc length rθ gives μ₀Iθ/(4πr) (θ = 2π gives μ₀I/2r for a full loop).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Hall voltage across a conducting strip of thickness t carrying current I in a perpendicular magnetic field B (n = carrier density, e = carrier charge) is:
सही उत्तर: घ) BI/(net)
In equilibrium eE_H = ev_dB with v_d = I/(neA); the Hall voltage V_H = E_H × width works out to BI/(net).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a tangent galvanometer, the current I is related to the deflection θ of the needle by:
सही उत्तर: ख) I ∝ tan θ
In equilibrium the coil's field B = B_H tan θ, and B ∝ I, so I = K tan θ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electron revolves in a circular orbit of radius r with speed v. The magnetic moment of this current loop is:
सही उत्तर: ग) evr/2
The current is I = e/T = ev/(2πr) and the area is πr², so μ = IA = evr/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bar magnet of moment M is placed at an angle θ to a uniform magnetic field B. The torque on it is:
सही उत्तर: ख) MB sin θ
τ = M × B, of magnitude MB sin θ, tending to align the magnet with the field.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnetic field at a distance r on the axial line of a short bar magnet of moment M is:
सही उत्तर: ख) (μ₀/4π)(2M/r³)
On the axial (end-on) line B = (μ₀/4π)(2M/r³); on the equatorial line it is half of this.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The absorption or evolution of heat along a single conductor whose parts are at different temperatures, when a current flows through it, is called the:
सही उत्तर: क) Thomson effect
The Thomson effect concerns a single conductor with a temperature gradient; the Peltier effect occurs at a junction of two different metals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A current of 2 A is passed through copper sulphate solution for 1000 s. If the electrochemical equivalent of copper is 3.3 × 10⁻⁷ kg/C, the mass of copper deposited is:
सही उत्तर: क) 0.66 g
By Faraday's first law, m = ZIt = 3.3 × 10⁻⁷ × 2 × 1000 = 6.6 × 10⁻⁴ kg = 0.66 g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The microscopic (point) form of Ohm's law is:
सही उत्तर: ग) J = σE
Current density J is proportional to the field: J = σE, where σ is the conductivity.
💬 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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