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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The Young's modulus of a perfectly rigid body is:
सही उत्तर: घ) Infinite
Y = stress/strain, and a perfectly rigid body has zero strain for any stress, so Y is infinite. Zero would describe a body offering no resistance to deformation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The time period of a seconds pendulum is:
सही उत्तर: ग) 2 s
A seconds pendulum takes 1 s for each swing from one extreme to the other, so its full period is 2 s. Its length is about 1 m on Earth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The total energy of a particle executing SHM is proportional to:
सही उत्तर: ख) The square of the amplitude
E = ½mω²A², so E ∝ A². Doubling the amplitude quadruples the energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mass of 1 kg attached to a spring of spring constant 100 N/m oscillates horizontally. Its angular frequency is:
सही उत्तर: क) 10 rad/s
ω = √(k/m) = √(100/1) = 10 rad/s. 100 rad/s comes from forgetting the square root.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In simple harmonic motion, the speed of the particle is maximum at:
सही उत्तर: घ) The mean position
v = ω√(A² − x²) is maximum at x = 0. At the extreme positions speed is zero but acceleration is maximum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In simple harmonic motion, the acceleration of the particle is:
सही उत्तर: ग) Proportional to displacement and directed towards the mean position
SHM is defined by a = −ω²x: magnitude proportional to displacement, direction towards the mean position. The minus sign is what makes the motion restoring.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solid sphere, a hollow sphere, a ring and a disc of the same mass and radius roll without slipping down the same incline from rest. Which reaches the bottom first?
सही उत्तर: ख) Solid sphere
Acceleration a = g sinθ/(1 + I/MR²); the solid sphere has the smallest I/MR² (2/5), so it is fastest. The ring (I/MR² = 1) is slowest.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Torque acting on a body is equal to the rate of change of its:
सही उत्तर: क) Angular momentum
τ = dL/dt is the rotational analogue of F = dp/dt. Rate of change of linear momentum gives force, not torque.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a uniform circular disc of mass M and radius R about an axis through its centre and perpendicular to its plane is:
सही उत्तर: घ) MR²/2
For a disc, I = MR²/2. MR² is for a thin ring, where all the mass is at distance R.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kepler's second law (law of areas) is a consequence of the conservation of:
सही उत्तर: ग) Angular momentum
Gravity is a central force, so it exerts no torque about the Sun and the planet's angular momentum is constant; this makes areal velocity constant. Hence planets move faster near perihelion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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