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 charged particle moves through a region containing only a uniform magnetic field. Which quantity remains constant?
सही उत्तर: घ) its speed (kinetic energy)
The magnetic force is always perpendicular to the velocity, so it does no work; the speed and kinetic energy stay constant while the direction changes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the Biot–Savart law, the magnetic field dB due to a current element I dl at a point at distance r (θ = angle between dl and r) is proportional to:
सही उत्तर: घ) I dl sin θ / r²
dB = (μ₀/4π) I dl sin θ / r², so it varies as the sine of the angle and inversely as the square of the distance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As the temperature of a pure semiconductor such as silicon is raised, its electrical resistance:
सही उत्तर: ग) decreases
Heating breaks more covalent bonds and creates more electron–hole pairs, so conductivity rises and resistance falls (negative temperature coefficient).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of electrons passing through a cross-section of a wire per second when it carries a current of 1 A is about:
सही उत्तर: ख) 6.25 × 10¹⁸
n = I/e = 1/(1.6 × 10⁻¹⁹) ≈ 6.25 × 10¹⁸ electrons per second.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform wire of resistance R is bent into an equilateral triangle. The resistance between any two of its corners is:
सही उत्तर: क) 2R/9
Each side has R/3; between two corners one side (R/3) is in parallel with the other two (2R/3): (R/3 × 2R/3)/R = 2R/9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using all three of three 3 Ω resistors in some combination, which of the following equivalent resistances can NOT be obtained?
सही उत्तर: क) 6 Ω
The possible values are 9 Ω (series), 1 Ω (parallel), 4.5 Ω (two in parallel + one in series) and 2 Ω (two in series, parallel with the third); 6 Ω is not possible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell of emf 2 V gives a terminal voltage of 1.8 V when connected to a 9 Ω resistor. Its internal resistance is:
सही उत्तर: घ) 1 Ω
I = V/R = 1.8/9 = 0.2 A; r = (E − V)/I = 0.2/0.2 = 1 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Van de Graaff generator builds up a very high potential mainly because:
सही उत्तर: ख) charge given to a hollow conductor moves to its outer surface
Charge transferred to the inside of a hollow conductor goes entirely to its outer surface, so charge can be added continuously and the potential keeps rising.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 V battery of negligible internal resistance is connected to 4 Ω and 2 Ω resistors in series. A 5 μF capacitor is connected across the 2 Ω resistor. In the steady state the charge on the capacitor is:
सही उत्तर: ग) 20 μC
In steady state no current flows into the capacitor; I = 12/6 = 2 A, so V across 2 Ω = 4 V and Q = CV = 5 μF × 4 V = 20 μC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1 μF capacitor discharges through a 1 MΩ resistor. The time taken for its charge to fall to half the initial value is about:
सही उत्तर: क) 0.69 s
q = q₀e^(−t/RC); q = q₀/2 when t = RC ln 2 = (10⁶ × 10⁻⁶) × 0.693 ≈ 0.69 s.
💬 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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