भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – इन्जिनियरिङ प्रवेश
Physics · Engineering Entrance – Mathematics, Physics, Chemistry & English · १,३९८ प्रश्न
१,३९८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान (Physics): 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 Venturimeter, used to measure the rate of flow of a liquid, works on:
सही उत्तर: ख) Bernoulli's principle
At the narrow throat the speed increases and the pressure falls; the pressure difference, via Bernoulli's equation, gives the flow rate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solid of volume 100 cm³ is completely immersed in water. The loss in its weight is about (g = 10 m/s²):
सही उत्तर: क) 1 N
Upthrust = weight of displaced water = (100 × 10⁻⁶ m³)(1000 kg/m³)(10 m/s²) = 1 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vessels of different shapes but equal base area are filled with water to the same height. The pressure at the base is:
सही उत्तर: ख) the same in all vessels
Hydrostatic pressure P = hρg depends only on the depth, not on the shape of the vessel (hydrostatic paradox).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire has Young's modulus 2 × 10¹¹ N/m². The stress required to produce a strain of 0.1% in it is:
सही उत्तर: क) 2 × 10⁸ N/m²
Stress = Y × strain = 2 × 10¹¹ × 0.001 = 2 × 10⁸ N/m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The modulus of rigidity (shear modulus) is the ratio of:
सही उत्तर: ग) shear stress to shear strain
The modulus of rigidity η = shear (tangential) stress/shear strain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Steel is said to be more elastic than rubber because:
सही उत्तर: ख) for the same stress, steel shows a much smaller strain
Elasticity is measured by the modulus (stress/strain); steel's Young's modulus is far larger, so it deforms less for the same stress.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The breaking stress of a wire depends on:
सही उत्तर: घ) the material of the wire only
Breaking stress is a property of the material; the breaking load depends on area, but the breaking stress does not.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hooke's law holds good for a material only up to its:
सही उत्तर: क) elastic (proportional) limit
Stress is proportional to strain only up to the proportional (elastic) limit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mass m is attached between two identical springs, each of force constant k, whose other ends are fixed to opposite walls. The period of its horizontal oscillation is:
सही उत्तर: क) 2π√(m/(2k))
When displaced, one spring stretches and the other compresses, each pulling it back, so k_eff = 2k and T = 2π√(m/2k).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A liquid column of total length L oscillates in a uniform U-tube. Its time period is:
सही उत्तर: घ) 2π√(L/(2g))
Displacing the levels by x gives a restoring force 2Aρgx on mass ALρ, so ω² = 2g/L and T = 2π√(L/2g).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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