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 boat moving at 5 m/s relative to the water heads perpendicular to the banks of a 60 m wide river flowing at 4 m/s. How far downstream does it land?
सही उत्तर: ख) 48 m
Crossing time = 60/5 = 12 s, during which the current carries it 4 × 12 = 48 m downstream.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown horizontally at 15 m/s from a height of 20 m. The angle its velocity makes with the horizontal just before it hits the ground is (g = 10 m/s²):
सही उत्तर: ग) tan⁻¹(4/3)
Fall time = √(2 × 20/10) = 2 s, so vᵧ = 20 m/s and vₓ = 15 m/s; tan θ = 20/15 = 4/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is projected at 50 m/s at 37° to the horizontal (sin 37° = 0.6, cos 37° = 0.8). Its horizontal range is (g = 10 m/s²):
सही उत्तर: घ) 240 m
R = u² sin 2θ/g = 2u² sin θ cos θ/g = 2 × 2500 × 0.6 × 0.8/10 = 240 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two stones are dropped from the same point, the second 1 s after the first. Their separation 3 s after the first stone is dropped is (g = 10 m/s²):
सही उत्तर: ख) 25 m
First stone falls ½ × 10 × 3² = 45 m and the second ½ × 10 × 2² = 20 m, so they are 25 m apart.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves in a straight line with initial velocity 10 m/s and a constant acceleration of −2 m/s². The distance it travels in the first 8 s is:
सही उत्तर: घ) 34 m
It stops at t = 5 s after 25 m, then moves back ½ × 2 × 3² = 9 m in the next 3 s; total distance = 25 + 9 = 34 m (displacement only 16 m).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of G is 6.67 × 10⁻¹¹ N m² kg⁻² in SI units. In CGS units (dyne cm² g⁻²) it is:
सही उत्तर: क) 6.67 × 10⁻⁸
1 N m² kg⁻² = 10⁵ dyne × 10⁴ cm² / 10⁶ g² = 10³ dyne cm² g⁻², so G = 6.67 × 10⁻⁸ CGS units.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The sum 12.11 + 18.0 + 1.012, rounded according to the rules for significant figures, is:
सही उत्तर: ग) 31.1
In addition the result keeps as many decimal places as the least precise term (18.0, one decimal place): 31.122 → 31.1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The length and breadth of a rectangle are (20.0 ± 0.1) cm and (10.0 ± 0.1) cm. The maximum percentage error in its area is:
सही उत्तर: घ) 1.5%
Percentage errors add for a product: 0.1/20 × 100 + 0.1/10 × 100 = 0.5% + 1% = 1.5%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following physical quantities is dimensionless?
सही उत्तर: ग) Strain
Strain is a ratio of two lengths (change in length/original length), so it has no dimensions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of capacitance is:
सही उत्तर: ख) [M⁻¹L⁻²T⁴A²]
C = q/V = [AT]/[ML²T⁻³A⁻¹] = [M⁻¹L⁻²T⁴A²].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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