SPSC 25 YEARS PAST PAPERS 2001 TO 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
ہائپوکلورس ایسڈ (ایچ سی ایل او) غیر مستحکم ہے اور آسانی سے ______ کو آزاد کرتا ہے؟
- Atomic Hydrogen
- Atomic Chlorine
- Atomic Oxygen
- None of these
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Explanation
Hypochlorous acid (HClO) is unstable and decomposes easily.It releases atomic oxygen (O), which acts as a strong oxidizing agent.
- The reaction will occur in forward and reverse directions
- The reaction will proceed in the forward direction
- The reaction will proceed in the reverse direction to attain the equilibrium
- None of these
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Explanation
When Qc < Kc, the reaction has fewer products than required at equilibrium.To reach equilibrium, the reaction shifts forward, increasing product formation.
- Aqueous ammonia
- Basic medium
- Acidic medium
- None of these
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Explanation
In an acidic medium, KMnO₄ (purple) is reduced to Mn²⁺ (colorless).The reduction occurs efficiently with H⁺ ions, making the solution lose its color.
خون کی بیماری کی ایک قسم جو تابکاری کی وجہ سے ہوتی ہے جیسے ایکس رے اور گاما کرنوں کی وجہ سے ہے؟
- Malaria
- Leukemia
- Hepatitis
- None of these
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Explanation
Leukemia is a blood cancer caused by mutations in blood-forming cells.It often triggered by radiation exposure.X-rays and gamma rays can damage DNA in bone marrow.This leading to uncontrolled white blood cell production.
خشک سیل میں الیکٹرولائٹ ______ کا نم پیسٹ ہے؟
- NH4Cl and MnO2
- NaCl and CuCl2
- NH4Cl and ZnCl2
- None of these
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Explanation
In a dry cell, the electrolyte is a moist paste of ammonium chloride (NH₄Cl) and zinc chloride (ZnCl₂) to facilitate ion flow.It helps in the movement of electrons between the zinc anode and the manganese dioxide cathode.
- Nascent Hydrogen
- Ordinary Hydrogen
- Atomic Oxygen
- None of these
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Explanation
Nascent hydrogen is a highly reactive form of hydrogen that facilitates the reduction of Fe³⁺ to Fe²⁺.It donates electrons to FeCl₃, converting it into FeCl₂ by reducing ferric (Fe³⁺) to ferrous (Fe²⁺).
پانی میں کون سا مرکب بہت تھوڑا سا گھلنشیل ہے؟
- AgCl
- NaCl
- NH4Cl
- None of these
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Explanation
AgCl (Silver chloride) is only very slightly soluble in water.
Due to its low solubility product (Ksp).
- Secant Method
- Newton-Raphson Method
- Bisection Method
- None of these
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Explanation
The Bisection Method is guaranteed to converge if the function changes signs over the interval.It is a robust and reliable method for root-finding.It ensuring convergence under the condition of a continuous function with opposite signs at the endpoints.
- Simultaneous displacement method
- Gauss-Seidel method
- Newton-Raphson method
- None of these
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Explanation
Jacobi's method involves solving a system of linear equations iteratively, updating all variables simultaneously in each iteration.It is distinct from the Gauss-Seidel method, where variables are updated sequentially.
- Scalar quantity
- Vector quantity
- Both A and B
- None of these
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Explanation
The divergence of a vector field measures the rate at which the field spreads out from a point and results in a scalar quantity.It is given by ∇ • f, producing a single numerical value at each point.
