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 charged particle enters a uniform magnetic field B with velocity v at an angle θ to the field. The pitch of its helical path is:
सही उत्तर: ख) 2πmv cos θ/(qB)
The period is 2πm/(qB) and the velocity component along B is v cos θ, so the pitch = (v cos θ)(2πm/(qB)).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A circular loop of radius R carries a current. At a point on its axis at distance R from the centre, the magnetic field is what fraction of the field at the centre?
सही उत्तर: घ) 1/(2√2)
B_axis = μ₀IR²/[2(R² + x²)^(3/2)]; with x = R this is μ₀I/(2R) × 1/2^(3/2), i.e. 1/(2√2) of the centre value.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thermocouple has its cold junction at 0 °C and a neutral temperature of 270 °C. Its temperature of inversion is:
सही उत्तर: क) 540 °C
The neutral temperature is the mean of the cold-junction and inversion temperatures: T_i = 2T_n − T_c = 540 °C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a fuse wire, the current at which it melts depends on its radius r but not on its length. This current is proportional to:
सही उत्तर: घ) r^(3/2)
In steady state, heat produced I²ρL/(πr²) equals heat lost ∝ 2πrL; L cancels and I² ∝ r³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sensitivity of a potentiometer can be increased by:
सही उत्तर: क) increasing the length of the potentiometer wire
A longer wire (with the same driving cell) gives a smaller potential gradient, so a given emf corresponds to a longer balancing length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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N identical cells (emf E, internal resistance r) are arranged in m parallel rows of n cells each (N = mn) across an external resistance R. The current is maximum when:
सही उत्तर: ख) R = nr/m
I = nE/(R + nr/m); for fixed N this is greatest when the external resistance equals the internal resistance of the battery, nr/m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A conductor of cross-section 2 mm² carries a current of 10 A. The current density in it is:
सही उत्तर: ग) 5 × 10⁶ A/m²
J = I/A = 10/(2 × 10⁻⁶) = 5 × 10⁶ A/m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three charges of +1 μC each are placed at the corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of the system is (k = 9 × 10⁹ N m² C⁻²):
सही उत्तर: घ) 0.27 J
U = 3kq²/a = 3 × 9 × 10⁹ × 10⁻¹²/0.1 = 0.27 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A hemisphere of radius R is placed in a uniform electric field E parallel to its axis. The electric flux through its curved surface is:
सही उत्तर: ख) πR²E
The net flux through the closed surface (curved part + flat disc) is zero, so the curved surface carries the same flux as the disc, πR²E.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equipotential surfaces of an isolated point charge are:
सही उत्तर: ख) concentric spheres centred on the charge
V = kq/r is constant wherever r is constant, i.e. on spheres centred on the charge.
💬 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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