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 2 kg block rests on a rough incline of 30° whose coefficient of static friction is 0.8. The friction force acting on it is (g = 10 m/s²):
सही उत्तर: ख) 10 N
The block is at rest, so static friction just balances mg sin 30° = 2 × 10 × 0.5 = 10 N (less than the limit μN ≈ 13.9 N).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a frame of reference moving with acceleration a, a body of mass m appears to experience a pseudo force of:
सही उत्तर: ग) ma, opposite to the frame's acceleration
To apply Newton's laws in a non-inertial frame, a pseudo force −ma is added, directed opposite to the frame's acceleration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body moving with uniform acceleration has speeds u and v at two points. Its speed at the midpoint of the distance between them is:
सही उत्तर: ग) √((u² + v²)/2)
Using v² − u² = 2as for each half: w² − u² = v² − w², so w = √((u² + v²)/2).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The minimum speed with which a stone must be thrown vertically upward to reach a height of 45 m is (g = 10 m/s²):
सही उत्तर: घ) 30 m/s
v² = 2gh = 2 × 10 × 45 = 900, so v = 30 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves in a circle of radius 1 m with a constant speed of π m/s. Its average velocity over a quarter revolution is about:
सही उत्तर: क) 2.83 m/s
Period T = 2π(1)/π = 2 s, so a quarter turn takes 0.5 s; displacement = √2 m, average velocity = √2/0.5 ≈ 2.83 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of the coefficient of thermal conductivity is:
सही उत्तर: ख) [MLT⁻³K⁻¹]
K = (power × length)/(area × temperature) = [ML²T⁻³][L]/([L²][K]) = [MLT⁻³K⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of thermal conductivity is:
सही उत्तर: ख) W m⁻¹ K⁻¹
From H = KA ΔT/L, K = HL/(AΔT), giving W·m/(m²·K) = W m⁻¹ K⁻¹.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Random errors in an experiment can be reduced by:
सही उत्तर: ग) taking the mean of a large number of repeated readings
Random errors are equally likely positive or negative, so averaging many readings reduces their effect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of electric field intensity is:
सही उत्तर: घ) [MLT⁻³A⁻¹]
E = F/q = [MLT⁻²]/[AT] = [MLT⁻³A⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of magnetic flux is:
सही उत्तर: क) [ML²T⁻²A⁻¹]
Φ = BA and B = [MT⁻²A⁻¹], so Φ = [MT⁻²A⁻¹][L²] = [ML²T⁻²A⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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