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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A substance with a small negative magnetic susceptibility is:
सही उत्तर: क) Diamagnetic
Diamagnetic materials (e.g. bismuth, copper) are weakly repelled by magnets and have small negative χ. Paramagnetic materials have small positive χ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two long parallel wires carry currents in the same direction. They:
सही उत्तर: घ) Attract each other
Parallel currents in the same direction attract, and opposite currents repel. This force was the basis of the earlier definition of the ampere.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnetic field at a distance of 10 cm from a long straight wire carrying a current of 10 A is (μ₀ = 4π × 10⁻⁷ T m/A):
सही उत्तर: ग) 2 × 10⁻⁵ T
B = μ₀I/(2πr) = (4π × 10⁻⁷ × 10)/(2π × 0.1) = 2 × 10⁻⁵ T. Forgetting to convert 10 cm to 0.1 m gives the wrong order of magnitude.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged particle of mass m and charge q moves with speed v perpendicular to a uniform magnetic field B. The radius of its circular path is:
सही उत्तर: ख) mv/(qB)
The magnetic force provides centripetal force: qvB = mv²/r, so r = mv/(qB). Faster or heavier particles move in larger circles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged particle moves parallel to a uniform magnetic field. The magnetic force on it is:
सही उत्तर: क) Zero
F = qvB sinθ and θ = 0°, so F = 0. The force is maximum when the motion is perpendicular to the field.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A potentiometer is preferred over a voltmeter for measuring the emf of a cell because:
सही उत्तर: घ) It draws no current from the cell at the balance point
At balance no current flows from the cell, so the true emf (not terminal voltage) is measured. A voltmeter always draws some current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the current through a resistor is doubled, the heat produced in the same time becomes:
सही उत्तर: ग) Four times
Joule's law: H = I²Rt, so H ∝ I² and doubling I gives 4H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Wheatstone bridge with arms P, Q, R and S is balanced when:
सही उत्तर: ख) P/Q = R/S
At balance no current flows through the galvanometer, giving P/Q = R/S. The metre bridge is based on this condition.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell of emf 2 V and internal resistance 0.5 Ω is connected to an external resistance of 3.5 Ω. The current in the circuit is:
सही उत्तर: क) 0.5 A
I = E/(R + r) = 2/(3.5 + 0.5) = 0.5 A. 0.57 A results from ignoring the internal resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kirchhoff's junction (current) law is based on conservation of:
सही उत्तर: घ) Charge
The sum of currents entering a junction equals the sum leaving, because charge cannot accumulate at the junction. The loop (voltage) law is based on energy conservation.
💬 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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