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۔
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 .
اورکت خطے میں ہائیڈروجن کی مندرجہ ذیل سیریز میں سے کون سا سلسلہ آتا ہے؟
Pfund
Lyman
Balmer
None of these
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Explanation
The Pfund series consists of hydrogen spectral lines that fall in the infrared region , with electron transitions to the fifth energy level (n = 5) .Other series : Lyman (UV, n = 1) Balmer (Visible, n = 2) Brackett (Infrared, n = 4)
فیوژن کے عمل میں جاری توانائی _______ ہے؟
Greater than fission
Equal to fission
Less than fission
None of these
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Explanation
Nuclear fusion releases more energy than fission because lighter nuclei (e.g., hydrogen) fuse to form a heavier nucleus (e.g., helium) , releasing a large amount of energy. The energy per nucleon in fusion is higher than fission , as seen in stars like the Sun, where hydrogen fusion powers immense energy output .
سب سے زیادہ توانائی کے الیکٹران _____ کے ذریعہ تیار کیے جائیں گے؟
Visible light
X-rays
Gamma rays
None of these
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Explanation
Gamma rays have the highest energy and shortest wavelength in the electromagnetic spectrum. They are produced in nuclear reactions and radioactive decay . This carrying extremely high energy capable of ionization and deep penetration .
سرنگ کا اثر ایک ممکن ____ ہے؟
Gamma decay
Positive beta decay
Alpha decay
None of these
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Explanation
Quantum tunneling allows alpha particles to escape the nuclear potential barrier , making alpha decay possible . This effect occurs when the energy of the particle is lower than the barrier , but due to wavefunction probability , it can still pass through.
ریڈیو ایکٹیویٹی ______ کے ساتھ وابستہ ہے؟
Emissions of electrons
Decay of Nucleus
Decay of atoms
None of these
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Explanation
Radioactivity is the spontaneous decay of an unstable atomic nucleus . It emitting radiation such as alpha, beta, or gamma rays .This process occurs in radioactive elements like uranium and radium , leading to nuclear transformation over time.
کامپٹن اثر ______ کے ساتھ وابستہ ہے؟
X-Rays
Alpha Rays
Beta Rays
None of these
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Explanation
The Compton Effect describes the scattering of X-rays when they collide with electrons, causing a change in wavelength. This effect provided key evidence for the particle nature of light (photon theory). It is significant in quantum mechanics .
مندرجہ ذیل میں سے کون سی لمبی طول موج ہے؟
X-rays
Visible light
Radio waves
None of these
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Explanation
Radio waves have the longest wavelength and the lowest frequency in the electromagnetic spectrum. They range from millimeters to kilometers in wavelength.
ہائیڈروجن ایٹم میں اعلی ترین تعدد کے فوٹون کی منتقلی جذب _______ ہے؟
j = 4 to j = 2
j = 1 to j = 2
j = 2 to j = 1
None of these
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Explanation
The highest frequency photon corresponds to the largest energy difference between levels in a hydrogen atom . The transition from j = 2 to j = 1 ( Lyman series ) emits the highest energy photon in the ultraviolet region. This meaning absorbing this photon would excite the electron back .
ٹرانسفارمر ______ کے تحفظ کے قانون کی پابندی کرتا ہے؟
E.M.F
Flux
Power
None of these
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Explanation
A transformer works on the principle of conservation of power . This meaning the input power (primary) is equal to the output power (secondary) (neglecting losses) . The relation is given by P = VI , where power remains constant but voltage and current change inversely .
