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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Neglecting air resistance, the path of a projectile fired at an angle to the horizontal is a:
सही उत्तर: ग) parabola
x varies linearly with t and y quadratically, so y = x tan θ − gx²/(2u²cos²θ), which is a parabola.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rain falls vertically at 4 m/s and a man runs horizontally at 3 m/s. The speed of the rain relative to the man is:
सही उत्तर: ख) 5 m/s
Relative velocity of rain = v_rain − v_man; the two are perpendicular, so the magnitude is √(4² + 3²) = 5 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward with a speed of 30 m/s. It returns to the thrower's hand after (g = 10 m/s²):
सही उत्तर: क) 6 s
Total time of flight = 2u/g = 2 × 30/10 = 6 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a body moving in a straight line, the area under its velocity–time graph gives its:
सही उत्तर: घ) displacement
Area under the v–t graph = ∫v dt = displacement, while its slope gives acceleration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of specific latent heat is:
सही उत्तर: ग) [L²T⁻²]
Latent heat L = Q/m has unit J/kg, so its dimensions are [ML²T⁻²]/[M] = [L²T⁻²].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following quantities has a unit but no dimensions?
सही उत्तर: ख) Plane angle
Plane angle is dimensionless but has the unit radian; strain, refractive index and relative density are ratios with neither unit nor dimension.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a vernier callipers, 10 vernier scale divisions coincide with 9 main scale divisions of 1 mm each. Its least count is:
सही उत्तर: क) 0.1 mm
Least count = 1 MSD − 1 VSD = 1 mm − 0.9 mm = 0.1 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If force F, velocity V and time T are taken as the fundamental quantities, the dimensional formula of mass is:
सही उत्तर: घ) [F V⁻¹ T]
From F = m × (velocity/time), m = F T/V, so mass has dimensions [F V⁻¹ T].
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light year is a unit of:
सही उत्तर: ग) distance
A light year is the distance travelled by light in vacuum in one year, about 9.46 × 10¹⁵ m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dimensional formula of torque is:
सही उत्तर: ख) [ML²T⁻²]
Torque = force × perpendicular distance = [MLT⁻²][L] = [ML²T⁻²], the same as that of work.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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