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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.
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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
401
Physics Medium

Which law of thermodynamics states that energy cannot be created or destroyed only converted from one form to another?

  • AZeroth Law
  • BSecond Law
  • CThird Law
  • DFirst Law
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Correct Answer: Option D — First Law
Explanation: The First Law of Thermodynamics also known as the Law of Conservation of Energy states that energy cannot be created or destroyed but only converted from one form to another.
Submitted by: PaperMCQs
402
Physics Easy

What is the unit of power in the SI system?

  • AWatt
  • BJoule
  • CNewton
  • DPascal
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Correct Answer: Option A — Watt
Explanation: The Watt is the SI unit of power named after James Watt and defined as one joule of energy transferred or converted per second.
Submitted by: PaperMCQs
403
Physics Easy

Which property of a body is measured by the amount of matter it contains?

  • AWeight
  • BDensity
  • CMass
  • DVolume
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Correct Answer: Option C — Mass
Explanation: Mass is the measure of the amount of matter contained in a body and remains constant regardless of location unlike weight which depends on gravitational field strength.
Submitted by: PaperMCQs
404
Physics Easy

What is the SI unit of energy?

  • AJoule
  • BWatt
  • CNewton
  • DPascal
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Correct Answer: Option A — Joule
Explanation: The Joule is the SI unit of energy defined as the work done when a force of one Newton moves an object one metre in the direction of the force.
Submitted by: PaperMCQs
405
Physics Medium

Which law states that the current through a conductor is directly proportional to the voltage across it?

  • AFaraday's Law
  • BOhm's Law
  • CKirchhoff's Law
  • DCoulomb's Law
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Correct Answer: Option B — Ohm's Law
Explanation: Ohm's Law states that the current I through a conductor is directly proportional to the voltage V across it at constant temperature expressed as V equals IR.
Submitted by: PaperMCQs
406
Physics Easy

What is the unit of electrical resistance?

  • AVolt
  • BAmpere
  • CWatt
  • DOhm
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Correct Answer: Option D — Ohm
Explanation: The Ohm named after German physicist Georg Simon Ohm is the SI unit of electrical resistance defined as the resistance that produces a potential difference of one volt per ampere.
Submitted by: PaperMCQs
407
Physics Easy

Which physical quantity is defined as force per unit area?

  • ADensity
  • BPressure
  • CStress
  • DTorque
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Correct Answer: Option B — Pressure
Explanation: Pressure is defined as force per unit area measured in Pascals in the SI system and applies to fluids and gases exerting force on surfaces equally in all directions.
Submitted by: PaperMCQs
408
Physics Medium

What is the approximate speed of sound in air at room temperature?

  • A343 m/s
  • B150 m/s
  • C1500 m/s
  • D3000 m/s
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Correct Answer: Option A — 343 m/s
Explanation: Sound travels at approximately 343 metres per second in air at room temperature of about 20 degrees Celsius and this speed increases with temperature.
Submitted by: PaperMCQs
409
Physics Medium

Which type of wave does not require a medium to travel?

  • ASound wave
  • BWater wave
  • CSeismic wave
  • DElectromagnetic wave
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Correct Answer: Option D — Electromagnetic wave
Explanation: Electromagnetic waves such as light radio waves and X-rays can travel through a vacuum without requiring a medium distinguishing them from mechanical waves like sound.
Submitted by: PaperMCQs
410
Physics Easy

What is the SI unit of electric current?

  • AVolt
  • BOhm
  • CAmpere
  • DWatt
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Correct Answer: Option C — Ampere
Explanation: The Ampere named after French physicist Andre-Marie Ampere is the SI base unit of electric current representing the flow of one coulomb of charge per second.
Submitted by: PaperMCQs
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