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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A 60 kg person stands on a weighing machine in a lift that is moving downward with an acceleration of 2 m/s². The machine reads (g = 10 m/s²):
सही उत्तर: क) 480 N
For downward acceleration, apparent weight = m(g − a) = 60 × (10 − 2) = 480 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 0.5 kg ball hits a wall normally at 10 m/s and rebounds at 8 m/s. The magnitude of the impulse on the ball is:
सही उत्तर: ख) 9 N s
Impulse = change in momentum = m(v₁ + v₂) for reversal of direction = 0.5 × (10 + 8) = 9 N s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 5 kg block on a horizontal floor (μk = 0.2) is pushed with a horizontal force of 30 N. Its acceleration is (g = 10 m/s²):
सही उत्तर: घ) 4 m/s²
Friction = μmg = 0.2 × 5 × 10 = 10 N; net force = 30 − 10 = 20 N; a = 20/5 = 4 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rain is falling vertically at 6 m/s and a man runs horizontally at 8 m/s. The speed of the rain relative to the man is:
सही उत्तर: ख) 10 m/s
The two velocities are perpendicular, so relative speed = √(6² + 8²) = √100 = 10 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a projectile, the maximum height attained equals the horizontal range when the angle of projection θ is:
सही उत्तर: घ) tan⁻¹(4)
H = R tanθ / 4, so H = R requires tanθ = 4, i.e. θ = tan⁻¹(4) ≈ 76°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body dropped from rest covers 45 m in the last second of its fall. The height from which it was dropped is (g = 10 m/s²):
सही उत्तर: क) 125 m
Distance in the nth second = g(n − ½) = 45 gives n = 5 s; height = ½gt² = ½ × 10 × 25 = 125 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car moving at 72 km/h is brought to rest with uniform retardation in 4 s. The distance covered while stopping is:
सही उत्तर: ख) 40 m
72 km/h = 20 m/s; with uniform retardation, distance = average speed × time = (20 + 0)/2 × 4 = 40 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The kinetic energy of a body is calculated as K = p²/2m. If the errors in measuring p and m are 3% and 2% respectively, the maximum percentage error in K is:
सही उत्तर: घ) 8%
Maximum error = 2 × (error in p) + (error in m) = 2 × 3% + 2% = 8%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a new system of units, the unit of force is 1 kN, the unit of length is 1 km and the unit of time is 100 s. The unit of mass in this system is:
सही उत्तर: क) 10⁴ kg
From F = ma, [M] = [F][T²]/[L]; unit of mass = 1000 N × (100 s)² / 1000 m = 10⁴ kg.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Above the Curie temperature, a ferromagnetic substance becomes:
सही उत्तर: क) Paramagnetic
Thermal agitation destroys the alignment of magnetic domains above the Curie temperature, so the material behaves as paramagnetic. It does not become diamagnetic.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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