भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – कृषि/वन प्रवेश
Physics · Agriculture, Veterinary & Forestry Entrance · ४२५ प्रश्न
४२५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान: 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 kinetic energy of a body of mass 2 kg moving at 10 m/s is:
सही उत्तर: क) 100 J
KE = ½mv² = ½ × 2 × 100 = 100 J. 200 J results from forgetting the factor ½.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A gun of mass 4 kg fires a bullet of mass 20 g with a velocity of 400 m/s. The recoil velocity of the gun is:
सही उत्तर: घ) 2 m/s
By conservation of momentum, 4V = 0.02 × 400 = 8, so V = 2 m/s. Forgetting to convert 20 g to 0.02 kg gives a very wrong answer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Impulse of a force is equal to the change in:
सही उत्तर: घ) Momentum
Impulse = F × Δt = Δp, the change in momentum (impulse–momentum theorem). Work, not impulse, equals the change in kinetic energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The linear momentum of a body of mass 2 kg moving with a velocity of 3 m/s is:
सही उत्तर: ग) 6 kg m/s
p = mv = 2 × 3 = 6 kg m/s. 9 would come from wrongly using ½mv² (kinetic energy) instead of momentum.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The slope of a velocity–time graph gives:
सही उत्तर: घ) Acceleration
Slope = change in velocity / time = acceleration. The area under the velocity–time graph, not its slope, gives displacement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car starts from rest and moves with a uniform acceleration of 2 m/s² for 5 s. The distance covered is:
सही उत्तर: क) 25 m
s = ut + ½at² = 0 + ½ × 2 × 25 = 25 m. 10 m is the final velocity value (v = at = 10 m/s), not distance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body is projected at 20 m/s at an angle of 45° to the horizontal. Taking g = 10 m/s², its horizontal range is:
सही उत्तर: क) 40 m
R = u² sin2θ/g = 400 × sin90°/10 = 40 m. 20 m would be the maximum height for a vertical throw at this speed, not the range.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stone is projected vertically upward at 30 m/s. Taking g = 10 m/s², the time after which it returns to the point of projection is:
सही उत्तर: ग) 6 s
Total time of flight T = 2u/g = 2 × 30/10 = 6 s. 3 s is only the time to reach the highest point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Planck's constant has the same dimensions as:
सही उत्तर: ग) Angular momentum
h = E/f has units J·s = kg m² s⁻¹, which is the same as angular momentum (mvr). Energy alone lacks the extra time factor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pressure due to water alone at a depth of 10 m (ρ = 1000 kg/m³, g = 10 m/s²) is:
सही उत्तर: ग) 1 × 10⁵ Pa
P = ρgh = 1000 × 10 × 10 = 1 × 10⁵ Pa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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