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 ball is thrown horizontally at 20 m/s from the top of a 45 m high cliff. Its speed just before hitting the ground is about (g = 10 m/s²):
सही उत्तर: ख) 36 m/s
Vertical speed = √(2gh) = 30 m/s; resultant = √(20² + 30²) = √1300 ≈ 36 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two cars move in the same direction along a straight road at 54 km/h and 36 km/h. The speed of the faster car relative to the slower one is:
सही उत्तर: ग) 5 m/s
Relative speed = 54 − 36 = 18 km/h = 18 × 5/18 = 5 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball thrown vertically upward at 40 m/s first reaches a height of 60 m after (g = 10 m/s²):
सही उत्तर: ग) 2 s
60 = 40t − 5t² gives t² − 8t + 12 = 0, so t = 2 s (going up) or 6 s (coming down).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car moving at 72 km/h is brought to rest by a uniform retardation of 4 m/s². The stopping distance is:
सही उत्तर: घ) 50 m
72 km/h = 20 m/s; s = u²/(2a) = 400/8 = 50 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Energy density (energy per unit volume) has the same dimensions as:
सही उत्तर: क) pressure
Energy/volume = [ML²T⁻²]/[L³] = [ML⁻¹T⁻²], which is the dimensional formula of pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The ratio E/B of the magnitudes of an electric field and a magnetic field has the dimensions of:
सही उत्तर: ख) velocity
From F = qE and F = qvB, E/B has the same dimensions as v, i.e. [LT⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The product 2.5 × 3.42, expressed with the correct number of significant figures, is:
सही उत्तर: ख) 8.6
The result must have as many significant figures as the least precise factor (2.5 has two): 8.55 rounds to 8.6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the determination of g = 4π²L/T² with a simple pendulum, the errors in L and T are 1% and 2% respectively. The maximum percentage error in g is:
सही उत्तर: ग) 5%
Δg/g = ΔL/L + 2ΔT/T = 1% + 2 × 2% = 5%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of self-inductance is:
सही उत्तर: घ) [ML²T⁻²A⁻²]
From U = ½LI², L = 2U/I² has dimensions [ML²T⁻²]/[A²] = [ML²T⁻²A⁻²].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of electric potential (voltage) is:
सही उत्तर: क) [ML²T⁻³A⁻¹]
V = W/q = [ML²T⁻²]/[AT] = [ML²T⁻³A⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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