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 body of mass 2 kg has a kinetic energy of 16 J. The magnitude of its linear momentum is:
सही उत्तर: ग) 8 kg m/s
p = √(2mK) = √(2 × 2 × 16) = √64 = 8 kg m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One kilowatt-hour (1 kWh) is equal to:
सही उत्तर: ख) 3.6 × 10⁶ J
1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 0.5 kg stone tied to a 1 m string is whirled in a horizontal circle at 2 revolutions per second. Neglecting gravity, the tension in the string is:
सही उत्तर: ग) 8π² N
ω = 2π × 2 = 4π rad/s; T = mω²r = 0.5 × 16π² × 1 = 8π² N (about 79 N).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A block slides down a smooth (frictionless) plane inclined at 30° to the horizontal. Its acceleration is (g = 10 m/s²):
सही उत्तर: ग) 5 m/s²
On a smooth incline a = g sin θ = 10 × sin 30° = 5 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Newton's third law, action and reaction forces:
सही उत्तर: ग) act on different bodies
Action and reaction are equal and opposite but act on two different bodies, so they never cancel each other.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The inertia of a body depends on its:
सही उत्तर: घ) mass
Mass is the quantitative measure of inertia.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle moves along a circle of radius r with constant speed. The magnitude of its displacement after half a revolution is:
सही उत्तर: घ) 2r
After half a revolution the particle is at the diametrically opposite point, so its displacement equals the diameter 2r (πr is the distance travelled).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is dropped from the top of a 45 m high tower. At the same instant another ball is thrown vertically upward from the foot of the tower with a speed of 30 m/s along the same line. They meet after:
सही उत्तर: घ) 1.5 s
Relative to each other there is no acceleration; they approach at 30 m/s and must close a gap of 45 m, so t = 45/30 = 1.5 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two balls are projected from the same point with the same speed at angles of 30° and 60° to the horizontal. The ratio of their maximum heights is:
सही उत्तर: ग) 1 : 3
H ∝ sin²θ, so H₁ : H₂ = sin²30° : sin²60° = 1/4 : 3/4 = 1 : 3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A swimmer who can swim at 4 m/s in still water heads straight across (perpendicular to the banks) a 100 m wide river flowing at 2 m/s. How far downstream does he land?
सही उत्तर: घ) 50 m
Time to cross = 100/4 = 25 s; drift = 2 × 25 = 50 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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