चिकित्सा शिक्षा आयोग (CEE) पारामेडिकल (B.Pharm, BPH, BMLT, BMIT, B.Optom) तयारी
चिकित्सा शिक्षा आयोग (CEE) – पारामेडिकल (B.Pharm, BPH, BMLT, BMIT, B.Optom)
Paramedical Bachelor 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 stone is dropped into a well 45 m deep. If the speed of sound is 340 m/s, the splash is heard after about (g = 10 m/s²):
सही उत्तर: क) 3.13 s
Fall time = √(2 × 45/10) = 3 s; sound travel time = 45/340 ≈ 0.13 s; total ≈ 3.13 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward with a speed of 30 m/s. For how long does it remain above a height of 25 m? (g = 10 m/s²)
सही उत्तर: घ) 4 s
h = 30t − 5t² = 25 gives t² − 6t + 5 = 0, so t = 1 s and 5 s; it stays above 25 m for 5 − 1 = 4 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle of mass 2 kg moves in a circle of radius 3 m with a constant speed of 4 m/s. Its angular momentum about the centre is:
सही उत्तर: ग) 24 kg m²/s
L = mvr = 2 × 4 × 3 = 24 kg m²/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ring, a disc, a solid sphere and a hollow sphere of the same mass and radius are released together from the top of the same incline and roll without slipping. Which reaches the bottom first?
सही उत्तर: ख) Solid sphere
a = g sinθ/(1 + k²/R²); k²/R² is smallest for the solid sphere (2/5), so it has the greatest acceleration and arrives first.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two satellites revolve around the Earth in circular orbits of radii r and 4r. The ratio of their orbital speeds v₁ : v₂ is:
सही उत्तर: घ) 2 : 1
Orbital speed v = √(GM/r) ∝ 1/√r, so v₁ : v₂ = √(4r/r) = 2 : 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A force F = (2î + 3ĵ) N acts at a point whose position vector is r = (î + 2ĵ) m. The torque of the force about the origin is:
सही उत्तर: ग) −k̂ N m
τ = r × F = (x F_y − y F_x) k̂ = (1 × 3 − 2 × 2) k̂ = −k̂ N m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of g at a small height h above the Earth's surface (h ≪ R) is equal to its value at a depth d below the surface. Then d equals:
सही उत्तर: ग) 2h
g_h = g(1 − 2h/R) and g_d = g(1 − d/R); equating them gives d = 2h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the radius of the Earth shrinks by 1% while its mass remains the same, the acceleration due to gravity on its surface will:
सही उत्तर: ग) increase by 2%
g = GM/R², so Δg/g = −2ΔR/R = −2 × (−1%) = +2%; g increases by about 2%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum speed with which a car can take an unbanked circular turn of radius 50 m, if the coefficient of friction between tyres and road is 0.5, is about (g = 10 m/s²):
सही उत्तर: क) 15.8 m/s
Friction provides the centripetal force: mv²/r = μmg, so v = √(μrg) = √(0.5 × 50 × 10) = √250 ≈ 15.8 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball dropped from a height of 9 m rebounds to a height of 4 m. The coefficient of restitution between the ball and the floor is:
सही उत्तर: क) 2/3
e = v_after/v_before = √(2gh₂)/√(2gh₁) = √(4/9) = 2/3.
💬 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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