इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ 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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Bernoulli's theorem for fluid flow is based on conservation of:
सही उत्तर: घ) Energy
Bernoulli's equation P + ½ρv² + ρgh = constant expresses energy conservation per unit volume. The equation of continuity expresses conservation of mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the radius of a capillary tube is halved, the height to which water rises in it becomes:
सही उत्तर: ग) Double
By Jurin's law h = 2T cosθ/(rρg), so h ∝ 1/r. Halving r doubles the height.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The excess pressure inside a soap bubble of radius r and surface tension T is:
सही उत्तर: ख) 4T/r
A soap bubble has two free surfaces, so excess pressure = 2 × 2T/r = 4T/r. For a liquid drop (single surface) it is 2T/r.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hooke's law (stress ∝ strain) holds strictly up to the:
सही उत्तर: क) Proportional limit
Stress is proportional to strain only up to the proportional limit; beyond it the graph is no longer linear. Beyond the yield point the material deforms plastically.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of the universal gravitational constant G is approximately:
सही उत्तर: ग) 6.67 × 10⁻¹¹ N m² kg⁻²
G ≈ 6.67 × 10⁻¹¹ N m² kg⁻², and it is the same everywhere. 9.8 m/s² is the acceleration due to gravity g, which varies with place.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The weight of a body at the centre of the Earth is:
सही उत्तर: ख) Zero
At the centre, g = g(1 − R/R) = 0, so weight mg = 0. The mass of the body, however, remains unchanged.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kepler's second law (law of areas) is a consequence of conservation of:
सही उत्तर: क) Angular momentum
Gravity is a central force, so it exerts no torque about the Sun; angular momentum is conserved, which means equal areas are swept in equal times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The time period of a geostationary satellite is:
सही उत्तर: घ) 24 hours
A geostationary satellite rotates with the Earth in the equatorial plane, so its period equals Earth's rotation period of about 24 hours. Hence it appears fixed in the sky.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The acceleration due to gravity at a depth of R/2 below the Earth's surface (R = radius of Earth) is:
सही उत्तर: ग) g/2
Inside a uniform Earth, g' = g(1 − d/R) = g(1 − 1/2) = g/2. g becomes zero only at the centre.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The acceleration due to gravity at a height equal to the Earth's radius R above the surface is:
सही उत्तर: ख) g/4
g' = g R²/(R + h)² = g R²/(2R)² = g/4. g/2 is a common mistake from treating g as inversely proportional to distance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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