All MCQs - Lecturer Physics Past Papers and Syllabus Practice | PakExamPoint
Practise All MCQs in Lecturer Physics Past Papers and Syllabus. Attempt multiple-choice questions, check answers and revise related subtopics.
All MCQs and revision practice
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.
Use these All MCQs to identify the facts, rules or methods you need to revise. Where an explanation is available, work through it and write down why your chosen option was correct or incorrect. Revisit difficult questions after reviewing your notes, then use exam mode for timed practice.
Explanation The kinetic energy gained by a charged particle in an electric field is given by KE = qV , where q is charge and V is the potential difference. Since kinetic energy is also KE = ½ mV² , equating both expressions gives V = √(2qV/m) . For particle A ( q ) and particle B ( 4q ), their velocities will be VA = √(2qV/m) and VB = √(8qV/m) . Taking the ratio : VA/VB = √(2qV/m) / √(8qV/m) = 1/2 .
Explanation According to special relativity , particles with zero rest mass (like photons) must always travel at the speed of light (c) in a vacuum. They cannot be at rest or travel at any other speed, as they have no mass to slow them down.
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 .
مستقل رفتار کے ساتھ چلنے والی ایک مثبت تبدیلی صفحہ کی نشاندہی کرنے والے یکساں مقناطیسی فیلڈ کے ایک خطے میں داخل ہوتی ہے۔ چارج پر مقناطیسی قوت کی سمت کیا ہے؟
A. To the bottom of the page
B. To the top of the page
C. None of these
D. Right
Check answer and explanation
Answer: To the top of the page
Explanation The magnetic force on a moving charge is given by Lorentz force : F = q ( v × B ) Using the right-hand rule , point your fingers in the direction of velocity ( v ), curl them toward the magnetic field ( out of the page ) , and your thumb points in the direction of force. For a positive charge , the force is toward the top of the page .
Explanation The spring constant K K is inversely proportional to the length of the spring. When a spring is cut into two equal parts , each half will have double the original spring constant, i.e., 2 K 2K .
مندرجہ ذیل میں سے کون سا مستقل تابکاری سے متعلق نہیں ہے؟
A. Solar constant
B. None of these
C. Boltzmann’s constant
D. Stefan’s constant
Check answer and explanation
Answer: Boltzmann’s constant
Explanation Boltzmann's constant is primarily related to thermodynamics and kinetic theory, not directly to radiation. Solar, Stefan’s, and Wien’s are directly associated with radiation laws and phenomena.
مقناطیسی میدان میں منتقل ہونے والے چارج پر کام کرنے والی طاقت کا انحصار _____ نہیں ہوگا؟
A. Intensity of the magnetic field
B. Its mass
C. Amount of charge
D. None of these
Check answer and explanation
Answer: Its mass
Explanation The magnetic force on a moving charge is given by F = qvB sinθ , where q is the charge, v is velocity, and B is the magnetic field intensity. Mass (m) does not appear in this equation , so the force is independent of the charge's mass.
Explanation Coherence refers to the phase consistency of a wave over time and space. Laser light is highly coherent because it emits waves that are monochromatic , in phase, and travel in the same direction .
وہ مواد جو مقناطیسی میدان کی طرف تھوڑا سا راغب ہوتا ہے وہ ______ ہے؟
A. Ferromagnetic
B. Paramagnetic
C. Diamagnetic
D. None of these
Check answer and explanation
Answer: Paramagnetic
Explanation Paramagnetic materials are slightly attracted to a magnetic field due to the presence of unpaired electrons . Unlike ferromagnetic materials , they do not retain magnetization when the external field is removed.
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