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PPSC MCQs

Punjab Public Service Commission β€” Complete MCQ Bank

9 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.
PPSC preparation illustration
1
Physics Medium

Which type of wave requires no medium and can travel through a vacuum at the speed of light?

  • ASound wave
  • BElectromagnetic wave
  • CWater wave
  • DSeismic wave
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Correct Answer: Option B β€” Electromagnetic wave
Explanation: Electromagnetic waves including light radio waves X-rays and gamma rays do not require a medium and travel through a vacuum at approximately 300000 kilometres per second.
Submitted by: PaperMCQs
2
Physics Medium

Which kinetic theory explains that gas pressure results from molecular collisions with container walls?

  • ABoyle's Law
  • BAvogadro's Law
  • CCharles's Law
  • DKinetic molecular theory
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Correct Answer: Option D β€” Kinetic molecular theory
Explanation: The kinetic molecular theory explains that gas pressure results from the constant random motion and elastic collisions of gas molecules with the walls of their container.
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3
Physics Medium

Which scientist discovered electromagnetic induction demonstrating that a changing magnetic field induces current?

  • AMichael Faraday
  • BJames Clerk Maxwell
  • CNikola Tesla
  • DHeinrich Hertz
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Correct Answer: Option A β€” Michael Faraday
Explanation: Michael Faraday discovered electromagnetic induction in 1831 demonstrating that a changing magnetic flux through a conductor induces an electromotive force forming the basis of generators.
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4
Physics Medium

Which principle states that pressure in a static fluid increases with depth depending on fluid density?

  • ABernoulli's Principle
  • BArchimedes' Principle
  • CPascal's Principle
  • DHydrostatic pressure principle
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Correct Answer: Option D β€” Hydrostatic pressure principle
Explanation: The hydrostatic pressure principle states that pressure in a static fluid increases linearly with depth depending on fluid density and gravitational acceleration expressed as P equals rho g h.
Submitted by: PaperMCQs
5
Physics Easy

Which property of a wave is the distance measured from one crest to the next crest?

  • AAmplitude
  • BFrequency
  • CWavelength
  • DSpeed
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Correct Answer: Option C β€” Wavelength
Explanation: Wavelength is the distance between two successive identical points on a wave such as crest to crest and is inversely related to frequency for waves travelling at the same speed.
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6
Physics Medium

Which phenomenon allows optical fibres to transmit light signals over long distances?

  • ATotal internal reflection
  • BRefraction
  • CDiffraction
  • DDispersion
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Correct Answer: Option A β€” Total internal reflection
Explanation: Total internal reflection occurs when light travelling in a dense medium hits the boundary at an angle greater than the critical angle causing all light to reflect back inside the fibre.
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7
Physics Medium

Which device converts light energy directly into electrical energy using the photovoltaic effect?

  • AGenerator
  • BTransformer
  • CSolar cell
  • DBattery
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Correct Answer: Option C β€” Solar cell
Explanation: A solar cell converts light energy directly into electrical energy using the photovoltaic effect when photons knock electrons free in semiconductor materials creating an electric current.
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8
Physics Medium

Which type of electromagnetic wave has the highest frequency and energy in the spectrum?

  • ARadio waves
  • BX-rays
  • CGamma rays
  • DUltraviolet
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Correct Answer: Option C β€” Gamma rays
Explanation: Gamma rays have the highest frequency and energy in the electromagnetic spectrum produced by nuclear reactions and radioactive decay and can only be blocked by thick lead or concrete.
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9
Physics Medium

Which scientist developed the theory of general relativity extending special relativity to include gravity?

  • AIsaac Newton
  • BAlbert Einstein
  • CNiels Bohr
  • DMax Planck
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Correct Answer: Option B β€” Albert Einstein
Explanation: Albert Einstein developed the theory of general relativity in 1915 describing gravity as a curvature of spacetime caused by mass and energy rather than a force between objects.
Submitted by: PaperMCQs