भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – इन्जिनियरिङ प्रवेश
Physics · Engineering Entrance – Mathematics, Physics, Chemistry & English · १,३९८ प्रश्न
१,३९८ 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 wheel with moment of inertia 2 kg m² rotates at 3 rad/s. Its rotational kinetic energy is:
सही उत्तर: ग) 9 J
K = ½Iω² = ½ × 2 × 9 = 9 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solid cylinder rolls down from rest without slipping through a vertical height h. Its speed at the bottom is:
सही उत्तर: ख) √(4gh/3)
mgh = ½mv²(1 + k²/R²) with k²/R² = ½ for a solid cylinder, so v² = 4gh/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rate of change of angular momentum of a body is equal to the:
सही उत्तर: क) external torque acting on it
τ = dL/dt is the rotational analogue of F = dp/dt.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the theorem of parallel axes, the moment of inertia about an axis parallel to one through the centre of mass at distance d is:
सही उत्तर: घ) I_cm + Md²
The parallel axes theorem states I = I_cm + Md², where I_cm is about the parallel axis through the centre of mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a uniform circular disc of mass M and radius R about one of its diameters is:
सही उत्तर: ग) MR²/4
About the central perpendicular axis I = MR²/2; by the perpendicular axes theorem, about a diameter I = (MR²/2)/2 = MR²/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the extension of a spring is doubled, the elastic potential energy stored in it becomes:
सही उत्तर: ख) four times
U = ½kx², so doubling x makes U four times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pump lifts 600 kg of water through a height of 10 m in 1 minute. The power of the pump is (g = 10 m/s²):
सही उत्तर: क) 1 kW
P = mgh/t = 600 × 10 × 10/60 = 1000 W = 1 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a perfectly inelastic collision, the coefficient of restitution is:
सही उत्तर: घ) 0
In a perfectly inelastic collision the bodies move together after impact, so the relative speed of separation and hence e is zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two bodies of masses 1 kg and 4 kg have equal kinetic energies. The ratio of their linear momenta is:
सही उत्तर: ग) 1 : 2
p = √(2mK); with equal K, p₁/p₂ = √(1/4) = 1/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work done by a conservative force on a particle moving around any closed path is:
सही उत्तर: ख) zero
For a conservative force the work depends only on the end points, so for a closed path (same start and end) it is zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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