IT प्रवेश – B.Sc. CSIT, BIT, BCA
IT प्रवेश – B.Sc. CSIT, BIT, BCA
IT Entrance – B.Sc. CSIT, BIT & BCA · २,६०७ प्रश्न
२,६०७ 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 closed surface encloses charges +3q and −q, while a charge +5q lies outside it. The net electric flux through the surface is:
सही उत्तर: ग) 2q/ε₀
By Gauss's law only enclosed charge counts: Φ = (3q − q)/ε₀ = 2q/ε₀.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The vibrating length of a stretched string is halved and its tension is made four times. Its fundamental frequency becomes:
सही उत्तर: ख) 4 times
f = (1/2L)√(T/μ): halving L doubles f and 4T doubles f again, so f becomes 4 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat required to convert 50 g of ice at 0 °C into water at 20 °C is (latent heat of fusion = 80 cal/g, specific heat of water = 1 cal g⁻¹ °C⁻¹):
सही उत्तर: ख) 5000 cal
Q = mL + mcΔT = 50 × 80 + 50 × 1 × 20 = 4000 + 1000 = 5000 cal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle in SHM has maximum speed v₀. Its speed when the displacement is half the amplitude is:
सही उत्तर: क) (√3/2) v₀
v = ω√(A² − x²) = ω√(A² − A²/4) = (√3/2)Aω = (√3/2)v₀.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum speed with which a car can safely take an unbanked curve of radius 40 m, if the coefficient of friction between tyres and road is 0.4, is about (g = 10 m/s²):
सही उत्तर: ग) 12.6 m/s
v_max = √(μrg) = √(0.4 × 40 × 10) = √160 ≈ 12.6 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two resistors give an equivalent resistance of 9 Ω in series and 2 Ω in parallel. The resistors are:
सही उत्तर: ग) 6 Ω and 3 Ω
R₁ + R₂ = 9 and R₁R₂/(R₁ + R₂) = 2 give R₁R₂ = 18, so the values are 6 Ω and 3 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 kg block is pulled up a smooth incline of 30° by a force of 20 N parallel to the incline. Its acceleration is (g = 10 m/s²):
सही उत्तर: ख) 5 m/s²
Net force = 20 − mg sin 30° = 20 − 10 = 10 N, so a = 10/2 = 5 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1000 kg car accelerates uniformly from rest to 20 m/s in 10 s on a level road. Neglecting losses, the average power delivered by the engine is:
सही उत्तर: घ) 20 kW
Work = ΔKE = ½ × 1000 × 20² = 2 × 10⁵ J; average power = 2 × 10⁵/10 = 2 × 10⁴ W = 20 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 20 g bullet moving at 300 m/s embeds itself in a 1.98 kg wooden block at rest on a smooth surface. The velocity of the block with the bullet is:
सही उत्तर: ख) 3 m/s
0.02 × 300 = (0.02 + 1.98)v gives v = 6/2 = 3 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1 kg ball falls from rest through 5 m onto the floor and rebounds to a height of 1.8 m. The magnitude of the impulse given by the floor is (g = 10 m/s²):
सही उत्तर: घ) 16 N s
Speed before impact = √(2 × 10 × 5) = 10 m/s down; after = √(2 × 10 × 1.8) = 6 m/s up; impulse = 1 × (6 + 10) = 16 N 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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