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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At the highest point of the path of an oblique projectile, its velocity and acceleration are:
सही उत्तर: ग) perpendicular to each other
At the top the velocity is horizontal while the acceleration g is vertically downward, so they are perpendicular.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a p–n junction diode under forward bias, the width of the depletion layer:
सही उत्तर: ग) decreases
Forward bias opposes the barrier potential, pushing majority carriers into the junction and narrowing the depletion region.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is thrown at 40 m/s at 30° to the horizontal. Its maximum height is (g = 10 m/s²):
सही उत्तर: घ) 20 m
H = u²sin²θ/(2g) = 1600 × 0.25/20 = 20 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body starts from rest with a uniform acceleration of 4 m/s². The distance it covers in the 3rd second is:
सही उत्तर: ग) 10 m
sₙ = u + a(2n − 1)/2 = 0 + 4 × 5/2 = 10 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stone dropped from the top of a building takes 4 s to reach the ground. The height of the building is (g = 10 m/s²):
सही उत्तर: ग) 80 m
h = ½gt² = ½ × 10 × 16 = 80 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car covers the first half of a distance at 40 km/h and the second half at 60 km/h. Its average speed is:
सही उत्तर: ग) 48 km/h
For equal distances, average speed = 2v₁v₂/(v₁ + v₂) = 2 × 40 × 60/100 = 48 km/h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile has a horizontal range equal to four times its maximum height. Its angle of projection is:
सही उत्तर: ग) 45°
u²sin 2θ/g = 4 × u²sin²θ/(2g) gives 2 sin θ cos θ = 2 sin²θ, so tan θ = 1 and θ = 45°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of significant figures in 0.003060 is:
सही उत्तर: क) 4
Leading zeros are not significant; 3, 0, 6 and the trailing 0 after the decimal point are, giving 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Bohr model of the hydrogen atom, the radius of the nth orbit is proportional to:
सही उत्तर: ग) n²
rₙ = 0.529 n² Å, so the radius is proportional to n².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of the coefficient of viscosity is:
सही उत्तर: ख) [ML⁻¹T⁻¹]
From F = ηA(dv/dx), η = F/(A × dv/dx) = [MLT⁻²]/([L²][T⁻¹]) = [ML⁻¹T⁻¹].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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