भौतिक विज्ञान (Physics) – Physics MCQ
भौतिक विज्ञान (Physics) – CEE प्रवेश
Physics · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४०७ प्रश्न
४०७ 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 angle of repose of a surface is 30°. The coefficient of static friction is:
सही उत्तर: ग) 1/√3
At the angle of repose, μ = tanθ = tan30° = 1/√3. √3 is tan60°, a common slip.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person of mass 60 kg stands in a lift accelerating upward at 2 m/s². The reading of a weighing machine (in newtons) is (g = 10 m/s²):
सही उत्तर: ख) 720 N
For upward acceleration, apparent weight = m(g + a) = 60 × 12 = 720 N. 480 N would be the reading if the lift were accelerating downward.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A force of 10 N acts on a 2 kg body initially at rest for 3 s. The final velocity of the body is:
सही उत्तर: क) 15 m/s
a = F/m = 5 m/s², so v = at = 5 × 3 = 15 m/s. Equivalently, impulse Ft = 30 N s equals change in momentum mv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body starts from rest with a uniform acceleration of 4 m/s². The distance travelled in the 3rd second is:
सही उत्तर: घ) 10 m
Sₙ = u + a(2n − 1)/2 = 0 + 4 × 5/2 = 10 m. 18 m is the total distance covered in 3 s, not in the 3rd second alone.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is fired with a speed of 20 m/s at 30° to the horizontal. Its time of flight is (g = 10 m/s²):
सही उत्तर: ग) 2 s
T = 2u sinθ/g = 2 × 20 × 0.5/10 = 2 s. 1 s is only the time taken to reach the highest point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a given speed of projection, the horizontal range of a projectile is maximum when the angle of projection is:
सही उत्तर: ख) 45°
R = u² sin2θ/g is maximum when sin2θ = 1, i.e. θ = 45°. Angles of 30° and 60° give equal but smaller ranges because they are complementary.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward with a speed of 20 m/s. The maximum height reached is (g = 10 m/s²):
सही उत्तर: क) 20 m
At the highest point v = 0, so h = u²/2g = 400/20 = 20 m. 40 m results from omitting the factor 2 in the denominator.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body is dropped from rest. The distance it falls in the first 3 s is (g = 10 m/s²):
सही उत्तर: घ) 45 m
s = ½gt² = ½ × 10 × 3² = 45 m. 90 m would result from forgetting the factor ½.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of significant figures in 0.007020 is:
सही उत्तर: ग) 4
Leading zeros are not significant, so only 7, 0, 2 and the trailing 0 count, giving 4. The trailing zero after the decimal point is significant, which is why 3 is wrong.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of the universal gravitational constant G is:
सही उत्तर: ख) [M⁻¹L³T⁻²]
From F = Gm₁m₂/r², G = Fr²/m² = [MLT⁻²][L²]/[M²] = [M⁻¹L³T⁻²]. The mass exponent is −1 because one power of M from force cancels one of the two in m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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