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 geostationary satellite must move in an orbit:
सही उत्तर: ख) in the equatorial plane, from west to east
To stay above one point it must orbit in the equatorial plane in the direction of the Earth's rotation (west to east) with a 24 h period.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The escape velocity from the surface of the Moon is about:
सही उत्तर: ग) 2.4 km/s
The Moon's small mass gives an escape speed of about 2.4 km/s, which is why it has retained no atmosphere.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A couple acting on a rigid body produces:
सही उत्तर: घ) pure rotation with no translation
A couple consists of two equal, opposite, non-collinear forces: the net force is zero but the net torque is not.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The theorem of perpendicular axes, I_z = I_x + I_y, is applicable to:
सही उत्तर: क) plane laminar bodies only
The perpendicular axes theorem holds for a lamina lying in the x–y plane, with z perpendicular to it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a thin-walled hollow cylinder of mass M and radius R about its own axis is:
सही उत्तर: क) MR²
All the mass lies at distance R from the axis, so I = MR².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car on a banked road moves faster than the optimum speed for that banking. The friction force on its tyres acts:
सही उत्तर: ख) down the incline
Above the optimum speed the car tends to slide outward (up the slope), so friction acts down the incline to supply extra centripetal force.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an oblique (glancing) elastic collision between two equal masses, one initially at rest, the two velocities after the collision are:
सही उत्तर: ग) at right angles to each other
With equal masses, momentum gives u = v₁ + v₂ and energy gives u² = v₁² + v₂², so v₁·v₂ = 0: the paths are perpendicular.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car starts from rest and its engine delivers constant power P (no losses). Its speed v varies with time t as:
सही उत्तर: घ) v ∝ √t
Pt = ½mv², so v = √(2Pt/m) ∝ √t.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following forces is non-conservative?
सही उत्तर: घ) kinetic friction
The work done by friction depends on the path and is not recovered on a closed path, so friction is non-conservative.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 50 kg man walks 4 m along a 200 kg boat floating at rest on still water (no friction). The boat moves through:
सही उत्तर: क) 0.8 m
The centre of mass stays fixed: 50(4 − x) = 200x gives x = 0.8 m, opposite to the man's motion.
💬 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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