चिकित्सा शिक्षा आयोग (CEE) बीडीएस प्रवेश परीक्षा तयारी
चिकित्सा शिक्षा आयोग (CEE) – बीडीएस प्रवेश परीक्षा
CEE – BDS Entrance · Medical Education Commission – CEE
२,०३९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
MBBS/BDS/Nursing प्रवेश: 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 body of mass m moving with speed v collides with a body of mass 3m at rest and they stick together. The fraction of the initial kinetic energy lost is:
सही उत्तर: घ) 3/4
Common velocity = mv/4m = v/4; final KE = ½(4m)(v/4)² = mv²/8, which is 1/4 of the initial ½mv², so 3/4 is lost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pump lifts 600 kg of water per minute to a height of 20 m. The minimum power of the pump is (g = 10 m/s²):
सही उत्तर: ग) 2 kW
P = mgh/t = 600 × 10 × 20 / 60 = 2000 W = 2 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves along the x-axis under a force F = (4 − 2x) newton. The work done by the force as it moves from x = 0 to x = 3 m is:
सही उत्तर: ख) 3 J
W = ∫₀³ (4 − 2x) dx = [4x − x²]₀³ = 12 − 9 = 3 J.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।