Practise All MCQs in Lecturer Physics Past Papers and Syllabus. Attempt multiple-choice questions, check answers and revise related subtopics.
Study All through multiple-choice questions in Lecturer Physics Past Papers and Syllabus. This subtopic contains 342 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.
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الیکٹران کی بہاؤ کی رفتار ______ ہے؟
Answer: 10^-3 m/sec
Explanation Drift velocity is the average velocity of electrons due to an applied electric field in a conductor. It is typically very small , in the range of 10⁻⁴ to 10⁻³ m/s , because electrons undergo frequent collisions while moving through the conductor .
Answer: Renewal
Explanation Reformation means تجدید Renewal means تجدید
Answer: Financially stable
Explanation Insolvent means دیوالیہ Financially stable مالی استحکام
آواز کی لہر کی پچ اس کے ______ سے متعلق ہے؟
Answer: Frequency
Explanation Pitch is the perception of how high or low a sound is, which depends on the frequency of the sound wave. Higher frequency → Higher pitch , Lower frequency → Lower pitch.
کونیی رفتار ______ کے تحت محفوظ ہے؟
Answer: Central force
Explanation Angular momentum is conserved when no external torque acts on a system. A central force (like gravitational or electrostatic force) always acts along the line joining the object and the center . It producing no torque , thus conserving angular momentum.
Answer: 2.05 MeV
Explanation Given: Energy of photon (E) = 4.1 MeV The total energy available for the electron and positron is: E - 2 × 0.511 MeV = 4.1 MeV - 1.022 MeV = 3.078 MeV Since the electron and positron share the energy equally, the kinetic energy of the electron is: 3.078 MeV / 2 = 1.539 MeV Adding the rest mass energy of the electron (0.511 MeV), we get: Energy of electron = 1.539 MeV + 0.511 MeV = 2.05 MeV
سورج کے ذریعہ تیار کردہ زیادہ تر توانائی ______ کی وجہ سے ہے؟
Answer: Nuclear fusion
Explanation The Sun's energy comes from nuclear fusion , where hydrogen nuclei fuse to form helium , releasing enormous energy. This process occurs in the Sun’s core under extreme temperature and pressure , following the proton-proton chain reaction.
دھات کے لئے ریاستوں کی کثافت بنیادی طور پر ______ پر منحصر ہے؟
Answer: The energy
Explanation The density of states (DOS) in a metal describes the number of available electron states at a given energy level. It primarily depends on the energy of the system , as it determines how electrons are distributed in different quantum states.
Answer: 8 days
Explanation Kepler's law states: T² = T₀ × (R/R₀)³/² Given: R₀ = Rₑ + h₀ (geo-stationary satellite) R = Rₑ + 4h₀ (new satellite) T₀ = 24 hours (1 day) R/R₀ = 5 T² ≈ 1 × 5³/² ≈ 8 days
کیپلر کے قوانین میں کہا گیا ہے کہ سورج کے بارے میں کسی بھی جسم کے وقت کی مدت کا مربع براہ راست _______ کے متناسب ہے؟
Answer: R³
Explanation According to Kepler's third law : The square of the time period ( T² ) of a planet. The Sun is directly proportional to the cube of the semi-major axis ( R³ ) of its orbit. Mathematically, this can be expressed as: T² ∝ R³
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