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 tuning fork of unknown frequency gives 4 beats per second with a 256 Hz fork. When its prong is loaded with a little wax, the beat frequency falls to 2 per second. The unknown frequency (before loading) is:
सही उत्तर: ग) 260 Hz
It is 252 or 260 Hz; loading lowers its frequency, and the beats decrease only if it was above 256 Hz, so it is 260 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the distance from a point source of sound is doubled, the intensity of sound becomes:
सही उत्तर: क) one-fourth
For a point source, intensity ∝ 1/r², so doubling r reduces intensity to 1/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The phase difference corresponding to a path difference of λ/4 between two points on a wave is:
सही उत्तर: ग) π/2
Phase difference = (2π/λ) × path difference = (2π/λ)(λ/4) = π/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sound travels faster in moist air than in dry air at the same temperature and pressure because moist air:
सही उत्तर: क) has a lower density
Water vapour (M = 18) is lighter than dry air (M ≈ 29), so moist air is less dense and v = √(γP/ρ) is larger.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the rms speed of the molecules of a gas in a closed vessel of fixed volume is doubled, its pressure becomes:
सही उत्तर: घ) four times
P = ⅓ρv²_rms with ρ fixed, so doubling v_rms makes P four times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of the Boltzmann constant k is about:
सही उत्तर: ग) 1.38 × 10⁻²³ J K⁻¹
k = R/N_A = 8.314/(6.022 × 10²³) ≈ 1.38 × 10⁻²³ J K⁻¹.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the molecules of a gas at a given temperature, the most probable speed (v_mp), average speed (v_av) and rms speed (v_rms) are related as:
सही उत्तर: क) v_mp < v_av < v_rms
They are in the ratio √2 : √(8/π) : √3 ≈ 1.41 : 1.60 : 1.73.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One mole of a monatomic ideal gas is mixed with one mole of a diatomic ideal gas. The ratio Cp/Cv for the mixture is:
सही उत्तर: ग) 1.5
Cv(mix) = (3/2 R + 5/2 R)/2 = 2R and Cp = Cv + R = 3R, so γ = 3R/2R = 1.5.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work done by an ideal gas in a reversible adiabatic expansion from state (P₁, V₁) to (P₂, V₂) is:
सही उत्तर: ग) (P₁V₁ − P₂V₂)/(γ − 1)
For an adiabatic process W = ∫P dV = (P₁V₁ − P₂V₂)/(γ − 1), which is positive for expansion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The internal energy of a given mass of an ideal gas depends only on its:
सही उत्तर: घ) temperature
An ideal gas has no intermolecular forces, so its internal energy is purely kinetic and depends only on temperature.
💬 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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