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 car moving on a circular track has a tangential acceleration of 3 m/s² and a centripetal acceleration of 4 m/s². The magnitude of its total acceleration is:
सही उत्तर: ग) 5 m/s²
The two components are perpendicular, so a = √(3² + 4²) = 5 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The angular speed of the Earth's rotation about its axis is about:
सही उत्तर: ख) 7.3 × 10⁻⁵ rad/s
ω = 2π/T = 2π/(86400 s) ≈ 7.3 × 10⁻⁵ rad/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is fired at 20 m/s at 60° above the horizontal. Its velocity becomes perpendicular to the initial velocity after (g = 10 m/s²):
सही उत्तर: ख) about 2.31 s
Setting (u cos θ, u sin θ − gt)·(cos θ, sin θ) = 0 gives u − gt sin θ = 0, so t = u/(g sin 60°) = 20/8.66 ≈ 2.31 s (before landing at 3.46 s).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The trajectory of a projectile is y = √3 x − 0.2x² (SI units, g = 10 m/s²). Its speed of projection is:
सही उत्तर: घ) 10 m/s
Comparing with y = x tan θ − g x²/(2u² cos²θ): tan θ = √3 gives θ = 60°, and 10/(2u² × 1/4) = 0.2 gives u² = 100, u = 10 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body moving with uniform acceleration covers 10 m in the 2nd second and 20 m in the 4th second of its motion. The distance it covers in the 6th second is:
सही उत्तर: ख) 30 m
Sₙ = u + a(n − ½): u + 1.5a = 10 and u + 3.5a = 20 give a = 5 m/s², u = 2.5 m/s, so S₆ = 2.5 + 5 × 5.5 = 30 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Five measurements of a period are 2.63 s, 2.56 s, 2.42 s, 2.71 s and 2.80 s. The mean absolute error is about:
सही उत्तर: घ) 0.11 s
The mean is 2.62 s; the absolute deviations 0.01, 0.06, 0.20, 0.09, 0.18 average to 0.108 ≈ 0.11 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kinematic viscosity (coefficient of viscosity divided by density) has the dimensional formula:
सही उत्तर: ग) [L² T⁻¹]
[η/ρ] = [M L⁻¹ T⁻¹]/[M L⁻³] = [L² T⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Assuming the speed v of deep-water waves depends only on g and the wavelength λ, dimensional analysis gives:
सही उत्तर: ग) v ∝ √(gλ)
Writing v = k gᵃ λᵇ: [L T⁻¹] = [L T⁻²]ᵃ [L]ᵇ gives a = 1/2 and b = 1/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio h/e (Planck's constant divided by electronic charge) has the same dimensions as:
सही उत्तर: घ) magnetic flux
[h/e] = [M L² T⁻¹]/[A T] = [M L² T⁻² A⁻¹], which is the dimensional formula of magnetic flux (weber).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The product μ₀ε₀ has the dimensions of:
सही उत्तर: क) [L⁻² T²]
Since c = 1/√(μ₀ε₀), μ₀ε₀ = 1/c², which has dimensions [L⁻² T²].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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