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 tank filled with water (refractive index 4/3) has a real depth of 4 m. Viewed from directly above, it appears to be:
सही उत्तर: क) 3 m deep
Apparent depth = real depth/μ = 4/(4/3) = 3 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When white light is dispersed by a glass prism, the colour deviated the most is:
सही उत्तर: ख) violet
Glass has the highest refractive index for violet light, so violet is deviated the most.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 30 cm. The focal length of the combination is:
सही उत्तर: घ) +60 cm
1/F = 1/20 − 1/30 = 1/60, so F = +60 cm (converging).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A man walks towards a plane mirror at 2 m/s. His image approaches him at:
सही उत्तर: घ) 4 m/s
The image moves towards the mirror at 2 m/s as he does, so their relative speed is 2 + 2 = 4 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sound waves cannot be polarised because they are:
सही उत्तर: ग) longitudinal
Polarisation is possible only for transverse waves; sound in air is longitudinal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the tension in a stretched string is made four times, its fundamental frequency:
सही उत्तर: घ) doubles
f = (1/2L)√(T/μ), so f ∝ √T; four times the tension doubles f.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio of the longest wavelength of the Lyman series to that of the Balmer series of hydrogen is:
सही उत्तर: ख) 5 : 27
1/λ_L = R(1 − 1/4) = 3R/4 and 1/λ_B = R(1/4 − 1/9) = 5R/36, so λ_L/λ_B = (5/36)/(3/4) = 5/27.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Laplace's correction to Newton's formula for the speed of sound in air assumes that sound propagation is:
सही उत्तर: घ) adiabatic
Compressions and rarefactions are too fast for heat exchange, so Laplace used the adiabatic modulus γP instead of P.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fundamental frequency of a 0.5 m long pipe open at both ends is (speed of sound = 340 m/s):
सही उत्तर: घ) 340 Hz
For an open pipe f = v/(2L) = 340/1 = 340 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At the same temperature and pressure, the ratio of the speed of sound in hydrogen to that in oxygen is:
सही उत्तर: ख) 4 : 1
v = √(γP/ρ); both are diatomic (same γ) and ρ ∝ molar mass (2 : 32), so v_H/v_O = √16 = 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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