चिकित्सा शिक्षा आयोग (CEE) आयुर्वेद र होमियोप्याथी (BAMS) तयारी
चिकित्सा शिक्षा आयोग (CEE) – आयुर्वेद र होमियोप्याथी (BAMS)
BAMS 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 ball moving with velocity v collides head-on elastically with an identical ball at rest. After the collision:
सही उत्तर: क) The first ball stops and the second moves with velocity v
In a one-dimensional elastic collision between equal masses, the velocities are exchanged. Moving together at v/2 happens only in a perfectly inelastic collision.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a perfectly inelastic collision, which of the following is conserved?
सही उत्तर: घ) Linear momentum only
Linear momentum is conserved in every collision with no external force, but in a perfectly inelastic collision the bodies stick together and kinetic energy is lost. Both are conserved only in an elastic collision.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A spring of spring constant 200 N/m is stretched by 0.1 m. The elastic potential energy stored is:
सही उत्तर: ग) 1 J
U = ½kx² = ½ × 200 × 0.01 = 1 J. 2 J results from omitting the factor ½.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the linear momentum of a body is doubled, its kinetic energy becomes:
सही उत्तर: ख) Four times
K = p²/2m, so doubling p multiplies K by 2² = 4. Doubling the speed has the same effect since K ∝ v².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work done by the centripetal force on a body in uniform circular motion is:
सही उत्तर: क) Zero
Centripetal force is always perpendicular to the displacement, so W = Fs cos90° = 0. That is why the speed (kinetic energy) remains constant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The working of a rocket is based on the conservation of:
सही उत्तर: घ) Linear momentum
Gases expelled backward carry momentum, and the rocket gains equal and opposite momentum. It does not need air to push against, which is why it works in space.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The angle of repose of a surface is 30°. The coefficient of static friction is:
सही उत्तर: ग) 1/√3
At the angle of repose, μ = tanθ = tan30° = 1/√3. √3 is tan60°, a common slip.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person of mass 60 kg stands in a lift accelerating upward at 2 m/s². The reading of a weighing machine (in newtons) is (g = 10 m/s²):
सही उत्तर: ख) 720 N
For upward acceleration, apparent weight = m(g + a) = 60 × 12 = 720 N. 480 N would be the reading if the lift were accelerating downward.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A force of 10 N acts on a 2 kg body initially at rest for 3 s. The final velocity of the body is:
सही उत्तर: क) 15 m/s
a = F/m = 5 m/s², so v = at = 5 × 3 = 15 m/s. Equivalently, impulse Ft = 30 N s equals change in momentum mv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body starts from rest with a uniform acceleration of 4 m/s². The distance travelled in the 3rd second is:
सही उत्तर: घ) 10 m
Sₙ = u + a(2n − 1)/2 = 0 + 4 × 5/2 = 10 m. 18 m is the total distance covered in 3 s, not in the 3rd second alone.
💬 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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