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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If the length of a simple pendulum is increased by 21%, its time period increases by:
सही उत्तर: घ) 10%
T ∝ √l, so T′/T = √1.21 = 1.1, an increase of 10%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The displacement of a particle in SHM is x = 4 cos(πt/2) cm, with t in seconds. Its time period is:
सही उत्तर: ग) 4 s
ω = π/2 rad/s, so T = 2π/ω = 4 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a particle executing simple harmonic motion, the graph of velocity against displacement is:
सही उत्तर: ख) an ellipse
v² = ω²(A² − x²) gives x²/A² + v²/(ωA)² = 1, which is an ellipse (a circle if the axes are suitably scaled).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two springs of force constants k₁ and k₂ are connected in parallel. The effective force constant is:
सही उत्तर: घ) k₁ + k₂
In parallel both springs have the same extension, so their restoring forces add: k = k₁ + k₂.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The height above the Earth's surface at which g decreases by 1% is about (R = 6400 km, h ≪ R):
सही उत्तर: क) 32 km
For h ≪ R, g_h ≈ g(1 − 2h/R); 2h/R = 0.01 gives h = 0.005 × 6400 = 32 km.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The period of revolution of a satellite orbiting very close to the Earth's surface is about:
सही उत्तर: क) 84 minutes
T = 2π√(R/g) = 2π√(6.4 × 10⁶/9.8) ≈ 5.1 × 10³ s ≈ 84 min.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Astronauts feel weightless inside a satellite orbiting the Earth because:
सही उत्तर: क) they and the satellite fall freely with the same acceleration
Gravity still acts, but the satellite and everything in it are in free fall together, so the floor exerts no normal reaction on them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The value of the universal gravitational constant G is about:
सही उत्तर: क) 6.67 × 10⁻¹¹ N m² kg⁻²
G ≈ 6.67 × 10⁻¹¹ N m² kg⁻², a very small value, which is why gravity between everyday objects is negligible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The gravitational field intensity at any point inside a uniform thin spherical shell is:
सही उत्तर: ख) zero
By the shell theorem, the gravitational pulls of different parts of the shell cancel everywhere inside it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the Earth's radius were to decrease by 1% with its mass unchanged, the acceleration due to gravity on its surface would:
सही उत्तर: ग) increase by about 2%
g = GM/R², so Δg/g = −2 ΔR/R = −2(−1%) = +2%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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