Join WhatsApp ChannelDaily MCQs & Exam Updates

PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
Exam Preparation Guide

How to prepare for PPSC

PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
Start PracticingTake a Mock Test
PPSC preparation illustration
All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
381
Physics Medium

Which type of nuclear reaction splits a heavy nucleus into smaller nuclei releasing large amounts of energy?

  • ANuclear fusion
  • BRadioactive decay
  • CNuclear fission
  • DBeta decay
Permalink
Correct Answer: Option C — Nuclear fission
Explanation: Nuclear fission splits a heavy nucleus such as uranium-235 into smaller nuclei releasing enormous amounts of energy and is the principle behind nuclear power plants and atomic bombs.
Submitted by: PaperMCQs
382
Physics Medium

What is the process by which an unstable atomic nucleus spontaneously emits radiation?

  • AFission
  • BFusion
  • CDiffraction
  • DRadioactive decay
Permalink
Correct Answer: Option D — Radioactive decay
Explanation: Radioactive decay is the spontaneous emission of radiation from an unstable atomic nucleus as it transforms into a more stable configuration releasing alpha beta or gamma radiation.
Submitted by: PaperMCQs
383
Physics Easy

Which particle in an atom has no electric charge?

  • AProton
  • BElectron
  • CNeutron
  • DPhoton
Permalink
Correct Answer: Option C — Neutron
Explanation: Neutrons are electrically neutral subatomic particles found in the nucleus of an atom alongside protons and their presence affects the mass and stability of the nucleus.
Submitted by: PaperMCQs
384
Physics Easy

Which particle carries a positive electric charge in an atom?

  • AElectron
  • BNeutron
  • CProton
  • DPhoton
Permalink
Correct Answer: Option C — Proton
Explanation: Protons are positively charged subatomic particles located in the nucleus of an atom with a charge equal in magnitude but opposite in sign to that of an electron.
Submitted by: PaperMCQs
385
Physics Easy

Which particle carries a negative electric charge in an atom?

  • AProton
  • BElectron
  • CNeutron
  • DNucleus
Permalink
Correct Answer: Option B — Electron
Explanation: Electrons are subatomic particles carrying a negative electric charge of 1.6 x 10 to the power of minus 19 coulombs and orbit the nucleus of an atom.
Submitted by: PaperMCQs
386
Physics Hard

Which phenomenon explains the formation of mirages in deserts?

  • AReflection of light
  • BDiffraction of light
  • CTotal internal reflection due to air density layers
  • DDispersion of light
Permalink
Correct Answer: Option C — Total internal reflection due to air density layers
Explanation: Mirages form due to total internal reflection when light rays from the sky refract through layers of air with varying temperature and density creating the illusion of water on the ground.
Submitted by: PaperMCQs
387
Physics Hard

What is the angle of incidence when a ray of light undergoes total internal reflection?

  • ALess than the critical angle
  • BEqual to 90 degrees
  • CGreater than the critical angle
  • DEqual to 45 degrees
Permalink
Correct Answer: Option C — Greater than the critical angle
Explanation: Total internal reflection occurs when light travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle causing all light to be reflected back.
Submitted by: PaperMCQs
388
Physics Medium

Which device converts electrical energy into mechanical energy?

  • AGenerator
  • BTransformer
  • CElectric motor
  • DCapacitor
Permalink
Correct Answer: Option C — Electric motor
Explanation: An electric motor converts electrical energy into mechanical energy using the interaction between electric current and a magnetic field to produce rotational motion.
Submitted by: PaperMCQs
389
Physics Medium

Which device converts mechanical energy into electrical energy?

  • AMotor
  • BTransformer
  • CGenerator
  • DBattery
Permalink
Correct Answer: Option C — Generator
Explanation: A generator converts mechanical energy into electrical energy through electromagnetic induction as a rotating coil moves within a magnetic field inducing an electric current.
Submitted by: PaperMCQs
390
Physics Easy

What is the acceleration due to gravity at the surface of the Earth?

  • A8.9 m/s squared
  • B10.8 m/s squared
  • C9.8 m/s squared
  • D7.8 m/s squared
Permalink
Correct Answer: Option C — 9.8 m/s squared
Explanation: The standard acceleration due to gravity at the Earth's surface is approximately 9.8 metres per second squared commonly rounded to 10 m/s squared in simple calculations.
Submitted by: PaperMCQs
Other Exams
CSS MCQs PMS MCQs FPSC MCQs PPSC MCQs NTS MCQs
Mock Tests
Quick Test (20 Q) Full Mock (60 Q)