भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – CEE प्रवेश
Physics · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०७ प्रश्न
४०७ 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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The excess pressure inside an air bubble of radius 1 mm just below the surface of water (surface tension 0.07 N/m) is:
सही उत्तर: ग) 140 Pa
An air bubble in a liquid has one free surface, so ΔP = 2T/r = 2 × 0.07/10⁻³ = 140 Pa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum length of a uniform wire that can hang vertically without breaking under its own weight depends on:
सही उत्तर: क) the breaking stress and density of its material
At the top, stress = weight/area = (ALρg)/A = Lρg; breaking occurs when Lρg = breaking stress, so L_max = breaking stress/(ρg), independent of area.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire is stretched by a load. If both its length and its radius are doubled (same material, same load), the extension becomes:
सही उत्तर: ख) half
ΔL = FL/(πr²Y); doubling L doubles it and doubling r divides it by 4, so ΔL becomes 2/4 = 1/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the amplitude of a particle in SHM is tripled and its frequency is doubled, its total energy becomes:
सही उत्तर: ख) 36 times
E = ½mω²A² ∝ f²A², so the energy becomes 2² × 3² = 36 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle performs SHM with a period of 2 s and an amplitude of 10 cm. Its maximum acceleration is about:
सही उत्तर: ग) 0.99 m/s²
ω = 2π/T = π rad/s; a_max = ω²A = π² × 0.1 ≈ 0.99 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Masses of 1 kg and 3 kg are placed on the x-axis at x = 0 and x = 4 m respectively. The centre of mass of the system is at:
सही उत्तर: ख) x = 3 m
x_cm = (1 × 0 + 3 × 4)/(1 + 3) = 12/4 = 3 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car engine delivers a power of 30 kW while the car moves at a steady 20 m/s. The driving force provided by the engine is:
सही उत्तर: ग) 1500 N
P = Fv, so F = P/v = 30000/20 = 1500 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stone is dropped into a well 45 m deep. If the speed of sound is 340 m/s, the splash is heard after about (g = 10 m/s²):
सही उत्तर: क) 3.13 s
Fall time = √(2 × 45/10) = 3 s; sound travel time = 45/340 ≈ 0.13 s; total ≈ 3.13 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward with a speed of 30 m/s. For how long does it remain above a height of 25 m? (g = 10 m/s²)
सही उत्तर: घ) 4 s
h = 30t − 5t² = 25 gives t² − 6t + 5 = 0, so t = 1 s and 5 s; it stays above 25 m for 5 − 1 = 4 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle of mass 2 kg moves in a circle of radius 3 m with a constant speed of 4 m/s. Its angular momentum about the centre is:
सही उत्तर: ग) 24 kg m²/s
L = mvr = 2 × 4 × 3 = 24 kg m²/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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