इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
इन्जिनियरिङ प्रवेश – Mathematics, Physics, Chemistry, English
Engineering Entrance – Mathematics, Physics, Chemistry & English · ३,८४१ प्रश्न
३,८४१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ प्रवेश: 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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Torque is the rotational analogue of:
सही उत्तर: क) Force
Torque causes angular acceleration just as force causes linear acceleration (τ = Iα vs F = ma). Moment of inertia is the analogue of mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ring, a disc, a hollow sphere and a solid sphere of the same mass and radius roll down the same incline from rest. Which reaches the bottom first?
सही उत्तर: घ) Solid sphere
Acceleration = g sinθ/(1 + K²/R²); the solid sphere has the smallest K²/R² (2/5), so it is fastest. The ring (K²/R² = 1) is slowest.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The radius of gyration of a uniform disc of radius R about an axis through its centre and perpendicular to its plane is:
सही उत्तर: ग) R/√2
I = MR²/2 = MK², so K = R/√2. K = R would apply to a ring.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ice skater spinning with arms outstretched pulls her arms in. Her angular velocity:
सही उत्तर: ख) Increases
With no external torque, angular momentum Iω is conserved. Pulling arms in reduces I, so ω increases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a thin ring of mass M and radius R about an axis through its centre and perpendicular to its plane is:
सही उत्तर: क) MR²
All the mass of a ring lies at distance R from the axis, so I = MR². MR²/2 is for a uniform disc about the same axis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work–energy theorem states that the work done by the net force on a body equals the change in its:
सही उत्तर: घ) Kinetic energy
W_net = ΔK for any type of force. Change in momentum equals impulse, not work.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a body collides head-on elastically with another body of equal mass at rest, the first body:
सही उत्तर: ग) Comes to rest and the second moves with the first body's initial velocity
For equal masses in a 1-D elastic collision, velocities are exchanged. Moving together happens only in a perfectly inelastic collision.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a perfectly inelastic collision, which quantity is conserved?
सही उत्तर: ख) Total linear momentum
Momentum of the system is conserved in all collisions when no external force acts. In a perfectly inelastic collision the bodies stick together and kinetic energy is lost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One kilowatt-hour is equal to:
सही उत्तर: क) 3.6 × 10⁶ J
1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J. The kWh is a unit of energy (not power), used in electricity bills.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A crane lifts a mass of 100 kg through a height of 10 m in 20 s. Its power is (g = 10 m/s²):
सही उत्तर: घ) 500 W
P = mgh/t = 100 × 10 × 10 / 20 = 500 W. 5000 W results from dividing the work by 2 s instead of 20 s.
💬 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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