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۔
چونکہ ایک مثالی گیس میں دباؤ میں اضافہ ہوتا ہے جس میں اوسطا سالماتی رفتار _____ ہے؟
Stays the same
Decreases at high temperature
Increases at high temperature, decreases at low
None of these
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Explanation
In an isothermal process , temperature remains constant , and the average molecular speed of an ideal gas depends only on temperature. Since temperature doesn't change , the average molecular speed also remains the same .
0.05Hz
10s
2Hz
None of these
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Explanation
Frequency (f) = Number of vibrations / Time f = 20 / 10 = 2 Hz Frequency is measured in Hertz (Hz) , where 1 Hz = 1 cycle per second .
جب بہتا ہوا پانی افقی پائپ پانی کے ______ کی مجبوری میں داخل ہوتا ہے؟
Speed decreases and pressure increases
Speed decreases and pressure decreases
Speed increases and pressure decreases
None of these
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Explanation
According to Bernoulli’s Principle , when fluid flows through a constriction, its velocity increases and pressure decreases .This happens because the total energy (kinetic + pressure) remains constant in an ideal fluid flow.
اگر کوئی شخص ______ اگر زمین پر زیادہ سے زیادہ دباؤ ڈال سکتا ہے تو؟
He stands with both feet flat on the ground
He lies down on the ground
He stands on the toes of one foot
None of these
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Explanation
Pressure = Force / Area , so reducing the contact area increases pressure. Standing on the toes of one foot minimizes the area , thus exerting maximum pressure on the ground.
جسمانی مقدار "تسلسل" میں وہی جہت ہے جو ______ کی طرح ہے؟
Momentum
Force
Power
None of these
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Explanation
Impulse is defined as Force × Time (F × t) , and its unit is Ns (Newton-second) . Momentum is Mass × Velocity (m × v) , which also has the unit Ns , meaning both have the same dimensions.
ایک شے سمندر میں مستقل رفتار پر عمودی طور پر اترتی ہے۔ آبجیکٹ پر کام کرنے والی تین قوتیں چپچپا ڈریگ اپرسٹ اور وزن ہیں۔ ان کی وسعت کے مابین کون سا تعلق درست ہے؟
Weight > upthrust
Weight < upthrust
Weight < drag
None of these
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Explanation
The object moves vertically downward at constant velocity , meaning forces are balanced. Weight is greater than upthrust because an additional force (viscous drag) also acts upward to balance the system.
11%
7%
8%
None of these
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Explanation
Uncertainty propagation in multiplication/division follows the rule:Δ P P = 2 × Δ V V + Δ R R Given uncertainty in V = e% and uncertainty in R = 2% , Total uncertainty = 2 ( e ) + 2 = 8 % text{Total uncertainty} = 2(e) + 2 = 8% (assuming e = 3%)
ایک تابکار ایٹم ایکس ایک بیٹا پارٹیکل خارج کرتا ہے۔ نتیجے میں ایٹم _____؟
Must be radioactive
Has an atomic number that is one more than that of X
Has a mass number that is one less than that of X
None of these
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Explanation
Beta decay occurs when a neutron converts into a proton, emitting a beta particle (electron) and an antineutrino.The atomic number increases by 1 , but the mass number remains the same .
ایک مثالی گیس کے لئے ایک آئیسوتھرمل عمل _____ کے ذریعہ پی_وی آریگرام پر نمائندگی کیا جاتا ہے؟
A portion of a hyperbola
A horizontal line
A vertical line
None of these
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Explanation
In an isothermal process , temperature remains constant, so PV = constant , forming a hyperbolic curve on a P-V diagram. This follows Boyle’s Law (P ∝ 1/V) for an ideal gas.
ایک ذرہ پر ایک قوت قدامت پسند ہے اگر ______؟
Its work depends on the end points of every motion, not on the path between them
Its work equals the change in the kinetic energy of the particle
It obeys Newton’s Second Law
None of these
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Explanation
A conservative force (e.g., gravitational or electrostatic) depends only on the initial and final positions, not on the path taken. The work done by a conservative force can be recovered completely, unlike non-conservative forces (e.g., friction).
