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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An object is placed at the centre of curvature of a concave mirror. The image is formed:
सही उत्तर: घ) at the centre of curvature, real, inverted and of the same size
With u = −2f, the mirror formula gives v = −2f: a real, inverted image of the same size at C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of images formed by two plane mirrors inclined at 60° to each other is:
सही उत्तर: क) 5
n = 360°/60° − 1 = 5.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a plane mirror is rotated through an angle θ (incident ray fixed), the reflected ray turns through:
सही उत्तर: ग) 2θ
Each angle of incidence and reflection changes by θ, so the reflected ray turns through 2θ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Keeping the tension the same, if the vibrating length of a sonometer wire is halved, its fundamental frequency:
सही उत्तर: क) doubles
f = (1/2L)√(T/μ) ∝ 1/L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stationary source emits sound of 600 Hz. An observer moves towards it at 33 m/s. If the speed of sound is 330 m/s, the frequency heard is:
सही उत्तर: ग) 660 Hz
f′ = f(v + v₀)/v = 600 × 363/330 = 660 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio of the fundamental frequency of an open organ pipe to that of a closed organ pipe of the same length is:
सही उत्तर: घ) 2 : 1
Open pipe: v/2L; closed pipe: v/4L; ratio 2 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At constant temperature, the speed of sound in a gas:
सही उत्तर: ख) is independent of the pressure
v = √(γP/ρ) and P/ρ is constant at constant temperature, so pressure changes do not affect v.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person hears the echo of his shout from a cliff 2 s after shouting. If the speed of sound is 340 m/s, the distance of the cliff is:
सही उत्तर: ग) 340 m
Sound travels to the cliff and back: 2d = 340 × 2, so d = 340 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A sound wave of frequency 500 Hz has a wavelength of 0.68 m. Its speed is:
सही उत्तर: क) 340 m/s
v = fλ = 500 × 0.68 = 340 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At constant temperature, the mean free path of the molecules of a gas is:
सही उत्तर: ख) inversely proportional to its pressure
λ = kT/(√2 πd²P), so λ ∝ 1/P at constant T.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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