भौतिक विज्ञान – Physics MCQ
भौतिक विज्ञान – कृषि/वन प्रवेश
Physics · Agriculture, Veterinary & Forestry Entrance · ४२५ प्रश्न
४२५ प्रश्न उपलब्ध। मोड छान्नुहोस्:
भौतिक विज्ञान: 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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Small liquid drops are spherical in shape because of:
सही उत्तर: ख) Surface tension
Surface tension tends to minimize the surface area, and a sphere has the least area for a given volume. Gravity actually flattens larger drops.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hooke's law states that, within the elastic limit:
सही उत्तर: क) Stress is directly proportional to strain
Within the elastic limit stress/strain = constant, called the modulus of elasticity (e.g. Young's modulus).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the distance between two masses is doubled, the gravitational force between them becomes:
सही उत्तर: ग) One-fourth
F ∝ 1/r², so doubling r makes F = F/4. 'Half' would be true only for an inverse (1/r) relation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body has a mass of 60 kg on Earth. Its mass on the Moon will be:
सही उत्तर: घ) 60 kg
Mass is the quantity of matter and does not change from place to place. Only weight on the Moon becomes about one-sixth of that on Earth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The period of revolution of a geostationary satellite is:
सही उत्तर: ख) 24 hours
A geostationary satellite moves with the Earth's rotation, so its period equals one day (about 24 h) and it appears fixed above a point on the equator.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ice skater spinning with arms outstretched pulls her arms in. Her angular speed increases because:
सही उत्तर: क) Angular momentum is conserved
With no external torque, L = Iω is constant; pulling the arms in reduces I, so ω increases. Her rotational kinetic energy actually increases (she does work).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A body of mass 1 kg moves in a circle of radius 1 m with a speed of 2 m/s. The centripetal force on it is:
सही उत्तर: ग) 4 N
F = mv²/r = 1 × 4/1 = 4 N. 2 N results from using mv/r instead of mv²/r.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A man of mass 60 kg climbs a staircase of vertical height 10 m in 20 s. Taking g = 10 m/s², his power is:
सही उत्तर: घ) 300 W
Power = mgh/t = 60 × 10 × 10/20 = 300 W. 6000 J is the work done; dividing it by time gives the power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The potential energy of a 5 kg body raised to a height of 10 m (g = 9.8 m/s²) is:
सही उत्तर: घ) 490 J
PE = mgh = 5 × 9.8 × 10 = 490 J. 50 J would be obtained by omitting g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the linear momentum of a body is doubled (mass constant), its kinetic energy becomes:
सही उत्तर: घ) Four times
KE = p²/2m, so doubling p increases KE by a factor of 2² = 4.
💬 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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