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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The escape velocity of a body from the Earth's surface:
सही उत्तर: क) does not depend on the mass of the body
vₑ = √(2GM/R) contains only the Earth's mass and radius, not the mass of the body.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The weight of a body on the Earth's surface is:
सही उत्तर: ख) greater at the poles than at the equator
g is larger at the poles because the polar radius is smaller and there is no centrifugal effect of rotation there.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The potential energy of a particle is U = 3x² joule (x in metres). The force on it at x = 2 m is:
सही उत्तर: घ) −12 N
F = −dU/dx = −6x = −12 N at x = 2 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1 kg ball is dropped from a height of 20 m. Neglecting air resistance, its kinetic energy just before hitting the ground is (g = 10 m/s²):
सही उत्तर: क) 200 J
KE gained = loss of PE = mgh = 1 × 10 × 20 = 200 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the linear momentum of a body increases by 20%, its kinetic energy increases by:
सही उत्तर: ग) 44%
K = p²/2m, so K′/K = (1.2)² = 1.44, an increase of 44%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Pulling a lawn roller at an angle above the horizontal is easier than pushing it at the same angle because:
सही उत्तर: क) the normal reaction, and hence friction, is smaller when pulling
When pulling, the vertical component of the force acts upward, reducing the normal reaction and the friction; when pushing it acts downward and increases them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 5 kg body hanging from a string is pulled upward by a force of 60 N through the string. Its acceleration is (g = 10 m/s²):
सही उत्तर: ग) 2 m/s² upward
Net force = 60 − 50 = 10 N upward, so a = 10/5 = 2 m/s² upward.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A person standing on a weighing machine in a lift reads zero weight when the lift:
सही उत्तर: घ) falls freely under gravity
In free fall a = g, so the normal reaction m(g − a) becomes zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two equal forces of magnitude F act at a point with an angle of 120° between them. The magnitude of their resultant is:
सही उत्तर: ख) F
R² = F² + F² + 2F² cos 120° = F², so R = F.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two balls are dropped from rest from heights h and 4h. The ratio of their times to reach the ground is:
सही उत्तर: ग) 1 : 2
t = √(2h/g) ∝ √h, so t₁ : t₂ = √1 : √4 = 1 : 2.
💬 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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