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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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)
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The slope of the position–time graph of a body at any instant gives its:
सही उत्तर: घ) instantaneous velocity
Slope of x–t graph = dx/dt = instantaneous velocity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two forces of magnitudes 3 N and 4 N act on a body. Their resultant can NOT be:
सही उत्तर: ग) 8 N
The resultant of two forces lies between their difference and their sum, i.e. from 1 N to 7 N, so 8 N is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A car moving at 20 m/s is brought to rest uniformly over a distance of 40 m. Its retardation is:
सही उत्तर: ख) 5 m/s²
v² = u² − 2as gives 0 = 400 − 80a, so a = 5 m/s².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ball is thrown vertically upward with a speed of 20 m/s. Its displacement after 3 s is (g = 10 m/s²):
सही उत्तर: ग) 15 m upward
s = ut − ½gt² = 20(3) − 5(9) = 15 m above the point of projection (the distance travelled is 25 m).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The velocity of a particle moving in a straight line is v = 3t² m/s. Its displacement between t = 0 and t = 2 s is:
सही उत्तर: ख) 8 m
Displacement = ∫₀² 3t² dt = [t³]₀² = 8 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One parsec is approximately equal to:
सही उत्तर: ग) 3.26 light years
1 parsec ≈ 3.09 × 10¹⁶ m ≈ 3.26 light years (1 light year ≈ 9.46 × 10¹⁵ m; 1.5 × 10¹¹ m is 1 AU).
💬 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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