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 force of 20 N acts on a body of mass 5 kg. Its acceleration is:
सही उत्तर: क) 4 m/s²
a = F/m = 20/5 = 4 m/s². 100 comes from multiplying instead of dividing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Newton's first law of motion gives the concept of:
सही उत्तर: घ) Inertia
The first law states a body remains at rest or uniform motion unless acted upon by an external force; this property is inertia. The second law gives a measure of force.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At the highest point of a projectile's path (angle of projection between 0° and 90°), the velocity and acceleration are:
सही उत्तर: ग) Perpendicular to each other
At the top, velocity is purely horizontal (u cosθ) while acceleration g acts vertically downward, so they are perpendicular. Velocity is not zero there unless the throw is vertical.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two trains move in opposite directions on parallel tracks at 54 km/h and 36 km/h. Their relative speed is:
सही उत्तर: ख) 25 m/s
For opposite directions speeds add: 90 km/h = 90 × 5/18 = 25 m/s. 5 m/s would be the relative speed if they moved in the same direction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The area under a velocity–time graph represents:
सही उत्तर: क) Displacement
Area under v–t graph = ∫v dt = displacement. The slope of the v–t graph (not area) gives acceleration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A stone is dropped from a height of 80 m. The time taken to reach the ground is (g = 10 m/s²):
सही उत्तर: घ) 4 s
h = ½gt² gives t = √(2h/g) = √(160/10) = 4 s. 16 s results from forgetting the square root (2h/g = 16).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car starts from rest and accelerates uniformly at 2 m/s² for 5 s. The distance covered is:
सही उत्तर: ख) 25 m
s = ut + ½at² = 0 + ½ × 2 × 5² = 25 m. 50 m results from forgetting the factor ½.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a dimensionless quantity?
सही उत्तर: क) Strain
Strain is the ratio of change in dimension to original dimension, so it has no units or dimensions. Stress, pressure and Young's modulus all have dimensions [ML⁻¹T⁻²].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The number of significant figures in 0.00450 is:
सही उत्तर: घ) 3
Leading zeros are not significant, but the trailing zero after the decimal point is significant, giving 4, 5, 0 = 3 significant figures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which pair of physical quantities has the same dimensions?
सही उत्तर: ग) Work and torque
Both work and torque have dimensions [ML²T⁻²]. However, torque is a vector while work is a scalar, so they are not the same physical quantity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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