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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The dimensional formula of impulse is:
सही उत्तर: घ) [MLT⁻¹]
Impulse = force × time = [MLT⁻²][T] = [MLT⁻¹], the same as momentum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of base (fundamental) quantities in the SI system is:
सही उत्तर: ग) 7
SI has seven base quantities: length, mass, time, electric current, temperature, amount of substance and luminous intensity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A radioactive substance has a half-life of 10 days. The fraction of it remaining after 30 days is:
सही उत्तर: घ) 1/8
30 days = 3 half-lives, so the fraction left = (1/2)³ = 1/8.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the kinetic energy of a free electron is made four times, its de Broglie wavelength becomes:
सही उत्तर: घ) Half
λ = h/√(2mK), so λ ∝ 1/√K and a fourfold K halves λ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Light of photon energy 5 eV falls on a metal of work function 2 eV. The stopping potential is:
सही उत्तर: क) 3 V
K_max = hν − φ = 5 − 2 = 3 eV, so the stopping potential is 3 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resonant frequency of an LC circuit is:
सही उत्तर: ग) 1/(2π√(LC))
At resonance ωL = 1/(ωC), so ω = 1/√(LC) and f = 1/(2π√(LC)).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a purely inductive AC circuit, the current:
सही उत्तर: क) Lags the voltage by π/2
For an ideal inductor V = L dI/dt, which makes the current lag the voltage by 90°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged particle moves in a circle in a uniform magnetic field perpendicular to its velocity. Its time period of revolution is independent of its:
सही उत्तर: ग) Speed
T = 2πm/(qB), which does not contain the speed; a faster particle simply moves in a larger circle.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two long parallel wires carry currents in the same direction. The force between them is:
सही उत्तर: क) Attractive
Parallel currents in the same direction attract each other, while opposite currents repel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnetic field at the centre of a circular coil of N turns, radius r, carrying current I is:
सही उत्तर: ख) μ₀NI/(2r)
From the Biot–Savart law, the field at the centre of one loop is μ₀I/2r; for N turns it is μ₀NI/2r.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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