IT प्रवेश – B.Sc. CSIT, BIT, BCA
IT प्रवेश – B.Sc. CSIT, BIT, BCA
IT Entrance – B.Sc. CSIT, BIT & BCA · २,६०५ प्रश्न
२,६०५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
IT 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 step-up transformer has 100 turns in the primary and 500 turns in the secondary. If 220 V AC is applied to the primary, the secondary voltage is:
सही उत्तर: ख) 1100 V
Vs/Vp = Ns/Np, so Vs = 220 × 500/100 = 1100 V. 44 V would result from using the inverse ratio as in a step-down transformer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lenz's law gives the:
सही उत्तर: घ) Direction of the induced current
Lenz's law states that the induced current flows in a direction that opposes the change producing it. The magnitude of induced emf is given by Faraday's law.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A meter bridge works on the principle of:
सही उत्तर: क) Wheatstone bridge
A meter bridge is a practical form of the Wheatstone bridge, using the balance condition P/Q = R/S to find an unknown resistance. A potentiometer is a different instrument based on potential drop along a wire.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistance of the filament of a bulb rated 220 V, 100 W is:
सही उत्तर: घ) 484 Ω
R = V²/P = 220²/100 = 48,400/100 = 484 Ω. Using V/P gives the meaningless value 2.2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three resistors of 2 Ω, 3 Ω and 6 Ω are connected in parallel. The equivalent resistance is:
सही उत्तर: क) 1 Ω
1/R = 1/2 + 1/3 + 1/6 = 1, so R = 1 Ω. 11 Ω would be their series combination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of electric field intensity is:
सही उत्तर: ग) N/C
Electric field E = F/q, so its unit is newton per coulomb (N/C), which is equivalent to volt per metre (V/m), not V·m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy stored in a 2 μF capacitor charged to 100 V is:
सही उत्तर: ख) 0.01 J
U = ½CV² = 0.5 × 2 × 10⁻⁶ × 100² = 0.01 J. Forgetting the factor ½ gives 0.02 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two capacitors of 2 μF and 3 μF are connected in series. Their equivalent capacitance is:
सही उत्तर: क) 1.2 μF
For series combination 1/C = 1/2 + 1/3 = 5/6, so C = 6/5 = 1.2 μF. 5 μF would be the parallel combination.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Brewster's law, the polarizing angle θp and refractive index n are related by:
सही उत्तर: क) tan θp = n
Brewster's law is n = tan θp; at this angle the reflected and refracted rays are perpendicular. sin C = 1/n is instead the relation for the critical angle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phenomenon that shows light waves are transverse in nature is:
सही उत्तर: घ) Polarization
Only transverse waves can be polarized, so polarization proves that light is transverse. Interference and diffraction show wave nature but occur for longitudinal waves (such as sound) too.
💬 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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