त्रिवि IT प्रवेश B.Sc. CSIT प्रवेश तयारी
त्रिवि IT प्रवेश – B.Sc. CSIT प्रवेश
TU B.Sc. CSIT Entrance · TU IT Entrance (B.Sc. CSIT, BIT, BCA)
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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The series limit (shortest wavelength) of the Lyman series of hydrogen is about (R = 1.097 × 10⁷ m⁻¹):
सही उत्तर: ग) 91 nm
1/λ = R(1/1² − 1/∞²) = R, so λ = 1/R ≈ 9.1 × 10⁻⁸ m ≈ 91 nm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pipe 0.5 m long is closed at one end. If the speed of sound is 340 m/s, the frequency of its first overtone is (ignore end correction):
सही उत्तर: घ) 510 Hz
A closed pipe gives odd harmonics; the first overtone is the 3rd harmonic: 3v/(4L) = 3 × 340/2 = 510 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gas occupies 3 L at 2 atm and 300 K. Its volume at 1 atm and 450 K is:
सही उत्तर: ख) 9 L
P₁V₁/T₁ = P₂V₂/T₂ gives V₂ = (2 × 3 × 450)/(300 × 1) = 9 L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At what depth below the Earth's surface does the acceleration due to gravity become one-fourth of its surface value (R = Earth's radius)?
सही उत्तर: क) 3R/4
g_d = g(1 − d/R) = g/4 gives d/R = 3/4, so d = 3R/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward at 25 m/s. The distance (not displacement) it travels in the first 3 s is (g = 10 m/s²):
सही उत्तर: ग) 32.5 m
It rises for 2.5 s to 31.25 m, then falls 0.5 × 10 × 0.5² = 1.25 m in the next 0.5 s; distance = 31.25 + 1.25 = 32.5 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A transformer takes 1000 W from the mains and delivers 900 W to the load. Its efficiency is:
सही उत्तर: क) 90%
η = output/input = 900/1000 = 90%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A current of 0.5 A flows through a 20 Ω resistor for 1 minute. The heat produced is:
सही उत्तर: घ) 300 J
H = I²Rt = 0.25 × 20 × 60 = 300 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two forces of 5 N each act at a point with an angle of 60° between them. The magnitude of their resultant is:
सही उत्तर: ग) 5√3 N
R = √(25 + 25 + 2 × 25 × cos 60°) = √75 = 5√3 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a body moving with uniform speed in a circle, which quantity remains constant?
सही उत्तर: क) kinetic energy
The speed is constant so KE = ½mv² is constant, but the direction of velocity, momentum and acceleration keeps changing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy needed to ionise a hydrogen atom whose electron is in the n = 2 state is:
सही उत्तर: ग) 3.4 eV
Eₙ = −13.6/n² eV; for n = 2, E = −3.4 eV, so 3.4 eV is needed to remove the electron.
💬 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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