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 1000 kg car moves at a steady 20 m/s up a slope rising 1 m in every 20 m of road, against a resistive force of 500 N. The power delivered by its engine is (g = 10 m/s²):
सही उत्तर: ख) 20 kW
Required force = mg sin θ + 500 = 1000 × 10 × (1/20) + 500 = 1000 N; P = Fv = 1000 × 20 = 20 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is dropped from a height of 20 m onto a hard floor. If the coefficient of restitution is 0.5, the height it reaches after the second bounce is:
सही उत्तर: ख) 1.25 m
Each bounce multiplies the height by e² = 0.25: 20 → 5 m → 1.25 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A force F = 3x² N acts along the x-axis. The work it does in moving a body from x = 0 to x = 2 m is:
सही उत्तर: क) 8 J
W = ∫₀² 3x² dx = [x³]₀² = 8 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sand drops vertically at 2 kg/s onto a conveyor belt moving horizontally at a constant 3 m/s. The extra horizontal force needed to keep the belt moving is:
सही उत्तर: घ) 6 N
F = v(dm/dt) = 3 × 2 = 6 N, the rate at which horizontal momentum is given to the sand.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 60 kg man jumps horizontally off a stationary 120 kg boat with a speed of 3 m/s. Neglecting water resistance, the boat moves back with a speed of:
सही उत्तर: ग) 1.5 m/s
Momentum is conserved: 60 × 3 = 120 × v, so v = 1.5 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is acted on by a force that rises linearly from 0 to 100 N in 0.1 s and then falls linearly to 0 in the next 0.1 s. The impulse delivered is:
सही उत्तर: ग) 10 N s
Impulse = area under the F–t graph = ½ × 0.2 s × 100 N = 10 N s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 5 kg block rests on a horizontal floor with μₛ = 0.5. A horizontal push of 10 N is applied. The friction force on the block is (g = 10 m/s²):
सही उत्तर: क) 10 N
Limiting friction is μₛmg = 25 N; since 10 N < 25 N the block stays at rest and static friction just balances the push: 10 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 kg block on a rough floor (μ = 0.2) is pulled by a 10 N force at 30° above the horizontal. The friction force acting on it while it slides is (g = 10 m/s²):
सही उत्तर: घ) 3 N
N = mg − F sin 30° = 20 − 5 = 15 N, so kinetic friction = μN = 0.2 × 15 = 3 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 3 kg block on a smooth 30° incline is tied by a light string over a pulley at the top to a hanging 2 kg mass. The acceleration of the system is (g = 10 m/s²):
सही उत्तर: ख) 1 m/s²
Net force = 2g − 3g sin 30° = 20 − 15 = 5 N on a total mass of 5 kg, so a = 1 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 50 kg person stands in a lift that is moving upward but slowing down at 2 m/s². The normal force from the floor on the person is (g = 10 m/s²):
सही उत्तर: क) 400 N
Moving up while slowing means acceleration is 2 m/s² downward: N = m(g − a) = 50 × 8 = 400 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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