गणित (Mathematics) – Mathematics MCQ
गणित (Mathematics) – इन्जिनियरिङ प्रवेश
Mathematics · Engineering Entrance – Mathematics, Physics, Chemistry & English · १,३०८ प्रश्न
१,३०८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
गणित (Mathematics): 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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If f(x) = 3x − 4 and g(x) = x², then g(f(2)) equals:
सही उत्तर: घ) 4
f(2) = 6 − 4 = 2, and g(2) = 2² = 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If A = {a}, the number of elements in P(P(A)), the power set of the power set of A, is:
सही उत्तर: क) 4
P(A) = {∅, {a}} has 2 elements, so P(P(A)) has 2² = 4 elements.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The inverse hyperbolic function sinh⁻¹x equals:
सही उत्तर: घ) ln(x + √(x² + 1))
Solving x = (eʸ − e⁻ʸ)/2 gives e²ʸ − 2x eʸ − 1 = 0, so eʸ = x + √(x² + 1) (taking the positive root) and y = ln(x + √(x² + 1)).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The derivative of tanh x with respect to x is:
सही उत्तर: ग) sech²x
tanh x = sinh x/cosh x; by the quotient rule its derivative is (cosh²x − sinh²x)/cosh²x = 1/cosh²x = sech²x.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fixed-point iteration xₙ₊₁ = φ(xₙ) converges to a root α (for x₀ close to α) if:
सही उत्तर: ख) |φ′(x)| < 1 near α
Near α, the error is multiplied by about |φ′(α)| at each step, so it shrinks to zero when |φ′(x)| < 1 in a neighbourhood of the root.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using Euler's method with step h = 0.1 for dy/dx = x + y, y(0) = 1, the approximate value of y(0.1) is:
सही उत्तर: क) 1.1
y₁ = y₀ + h·f(x₀, y₀) = 1 + 0.1 × (0 + 1) = 1.1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A projectile is fired with speed 20 m/s at 30° to the horizontal. Taking g = 10 m/s², its time of flight is:
सही उत्तर: घ) 2 s
T = 2u sin α/g = 2 × 20 × (1/2)/10 = 2 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A particle is projected with speed 20 m/s. Taking g = 10 m/s², its maximum horizontal range on level ground is:
सही उत्तर: क) 40 m
R = u² sin 2α/g is greatest at α = 45°: R_max = u²/g = 400/10 = 40 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three forces of equal magnitude acting at a point keep it in equilibrium. The angle between any two of them is:
सही उत्तर: ग) 120°
For equal forces in equilibrium, by Lami's theorem the sines of the angles between them are equal, which with total 360° gives 120° each.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If λ is the angle of friction between two surfaces, the coefficient of friction μ is:
सही उत्तर: ख) tan λ
The resultant reaction makes angle λ with the normal when friction is limiting, and F/R = μ = tan λ.
💬 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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