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 thin prism of angle 5° is made of glass of refractive index 1.5. The deviation it produces is:
सही उत्तर: क) 2.5°
For a thin prism δ = (μ − 1)A = 0.5 × 5° = 2.5°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is viewed normally through a glass slab 6 cm thick of refractive index 1.5. The apparent shift of the object is:
सही उत्तर: ख) 2 cm
Normal shift = t(1 − 1/μ) = 6(1 − 2/3) = 2 cm, towards the observer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin equi-convex lens of focal length f is cut into two identical plano-convex halves by a plane perpendicular to its principal axis. The focal length of each half is:
सही उत्तर: ग) 2f
Each half has only one curved surface, so its power is half that of the original lens and its focal length is 2f.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a convex lens of focal length f, the minimum possible distance between a real object and its real image is:
सही उत्तर: ख) 4f
The object–image separation u + v is least when u = v = 2f, giving 4f.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An object is placed 20 cm in front of a convex mirror of focal length 20 cm. The image is formed:
सही उत्तर: ख) 10 cm behind the mirror
With u = −20 cm and f = +20 cm: 1/v = 1/f − 1/u = 1/20 + 1/20 = 1/10, so v = +10 cm (virtual, behind the mirror).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pipe open at both ends can produce:
सही उत्तर: ग) all harmonics, odd as well as even
An open pipe has antinodes at both ends, so it supports frequencies nv/2L for every integer n.
💬 टिप्पणी / गल्ती रिपोर्ट (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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