SPSC PHYSICS 25 YEARS PAST PAPERS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
De-Broglie
Einstein
Hygen
None of these
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Explanation
Louis de Broglie proposed the wave-particle duality of matter. It stating that particles like electrons exhibit wave-like properties .His equation λ = h/p (where λ is wavelength, h is Planck’s constant, and p is momentum) describes the matter waves concept.
گونج پر ، مندرجہ ذیل میں سے کون زیادہ سے زیادہ ہے؟
Amplitude
Frequency
Wavelength
None of these
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Explanation
Resonance occurs when a system vibrates at its natural frequency due to an external periodic force. At resonance, amplitude reaches its maximum value because the energy transfer is most efficient.
ایک ریوسٹاٹ کو _____ کے طور پر استعمال کیا جاسکتا ہے؟
Potential divider
Variable resistor
Both A and B
None of these
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Explanation
A rheostat is a type of variable resistor used to control current in a circuit. It can also function as a potential divider by adjusting voltage across components.
جس عمل میں دباؤ مستقل رہتا ہے اسے ______ کہا جاتا ہے؟
Isobaric
Isothermal
Adiabatic
None of these
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Explanation
“Iso-” means constant; “baric ” relates to pressure .
In an isobaric process , pressure remains unchanged .
Volume or temperature can change during the process.
Examples: heating a gas in a piston-cylinder system a t constant atmospheric pressure.
Isochoric = constant volume, isothermal = constant temperature, adiabatic = no heat transfer.
Last updated question 25 feb 2026
اینٹروپی میں تبدیلی _____ کے لئے صفر ہے؟
Reversible isobaric processes
Reversible adiabatic processes
Reversible isothermal processes
None of these
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Explanation
In a reversible adiabatic process , no heat is exchanged with the surroundings ( Q = 0 ), so the change in entropy (ΔS ) is zero. Entropy change is linked to heat transfer, and since no heat enters or leaves, entropy remains constant.
گیس کا دباؤ براہ راست ______ متناسب ہے؟
Wind energy
Potential energy
Kinetic energy
None of these
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Explanation
According to the Kinetic Theory of Gases , gas pressure is caused by the collisions of molecules with container walls, which depend on their kinetic energy .Higher kinetic energy (due to increased temperature) leads to more forceful and frequent collisions, raising the pressure of the gas.
ایک کروی کنڈکٹر کی صلاحیت عددی طور پر ______ کے برابر ہے؟
Volume
Radius
Diameter
None of these
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Explanation
The capacitance (C) of a spherical conductor is given by the formula: C = 4πε₀R , where R is the radius of the sphere. This shows that the capacitance is directly proportional to the radius and independent of volume or surface area.
ہیلیم کی پابند توانائی ______ ہے؟
31 MeV
20 MeV
28.2 MeV
None of these
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Explanation
Helium-4 has a binding energy of 28.2 MeV . It is the energy required to separate its nucleons. This high binding energy makes helium-4 one of the most stable nuclei.
ایک پی این جنکشن _____ کے طور پر استعمال کیا جاسکتا ہے؟
Rectifier
Amplifier
Oscillator
None of these
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Explanation
A PN junction can be used as a rectifier Used to convert alternating current (AC) to direct current (DC) It acts as a one-way valve, allowing current t o flow only in one direction. It switches on (conducts) in forward bias and off (blocks) in reverse bias.
کے ذریعہ پوزیٹرون دریافت ہوا؟ ______
Bohr
Chadwick
Anderson
None of these
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Explanation
Carl D. Anderson discovered the positron (antiparticle of the electron) in 1932 while studying cosmic rays . He observed it using a cloud chamber and confirmed it was a particle with the same mass as an electron but with a positive charge .
