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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
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PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

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Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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351
Physics Medium

Which scale of temperature is used in thermodynamic calculations and starts at absolute zero?

  • AKelvin
  • BCelsius
  • CFahrenheit
  • DRankine
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Correct Answer: Option A — Kelvin
Explanation: The Kelvin scale is the SI thermodynamic temperature scale starting at absolute zero and used in all scientific thermodynamic calculations because it has no negative values.
Submitted by: PaperMCQs
352
Physics Medium

What is absolute zero temperature in degrees Celsius?

  • A0 degrees Celsius
  • Bminus 100 degrees Celsius
  • Cminus 273 degrees Celsius
  • Dminus 373 degrees Celsius
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Correct Answer: Option C — minus 273 degrees Celsius
Explanation: Absolute zero is minus 273.15 degrees Celsius or 0 Kelvin the theoretical lowest temperature at which particles have minimum thermal motion.
Submitted by: PaperMCQs
353
Physics Medium

Which law states that the volume of a gas is directly proportional to its absolute temperature at constant pressure?

  • ACharles's Law
  • BBoyle's Law
  • CAvogadro's Law
  • DGay-Lussac's Law
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Correct Answer: Option A — Charles's Law
Explanation: Charles's Law states that at constant pressure the volume of a fixed amount of gas is directly proportional to its absolute temperature in Kelvin.
Submitted by: PaperMCQs
354
Physics Medium

Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?

  • ABoyle's Law
  • BCharles's Law
  • CAvogadro's Law
  • DGay-Lussac's Law
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Correct Answer: Option A — Boyle's Law
Explanation: Boyle's Law states that at constant temperature the pressure of a fixed amount of gas is inversely proportional to its volume meaning doubling pressure halves the volume.
Submitted by: PaperMCQs
355
Physics Medium

Which type of spectrum is produced when white light passes through a prism?

  • ALine emission spectrum
  • BContinuous spectrum
  • CBand spectrum
  • DAbsorption spectrum
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Correct Answer: Option B — Continuous spectrum
Explanation: A prism produces a continuous spectrum showing a smooth gradation from red to violet as white light is dispersed into its component wavelengths through refraction.
Submitted by: PaperMCQs
356
Physics Hard

What is polarisation of light?

  • ASplitting light into its spectrum
  • BRestriction of light vibrations to a single plane
  • CBending of light around obstacles
  • DTotal reflection of light
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Correct Answer: Option B — Restriction of light vibrations to a single plane
Explanation: Polarisation restricts the transverse vibrations of light to a single plane demonstrating that light is a transverse wave and is used in polaroid sunglasses and LCD screens.
Submitted by: PaperMCQs
357
Physics Medium

Which experiment demonstrated that light behaves as a wave by producing an interference pattern?

  • AYoung's double slit experiment
  • BRutherford's gold foil experiment
  • CMillikan's oil drop experiment
  • DCompton scattering experiment
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Correct Answer: Option A — Young's double slit experiment
Explanation: Young's double slit experiment demonstrated light's wave nature by producing alternating bright and dark fringes on a screen when coherent light passed through two closely spaced slits.
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358
Physics Medium

What is the phenomenon where two waves superpose to produce regions of maximum and minimum intensity?

  • AInterference
  • BDiffraction
  • CRefraction
  • DPolarisation
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Correct Answer: Option A — Interference
Explanation: Interference occurs when two coherent waves superpose to produce alternating regions of constructive interference maximum intensity and destructive interference minimum intensity.
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359
Physics Medium

What is simple harmonic motion?

  • AMotion in a circle at constant speed
  • BOscillatory motion where restoring force is proportional to displacement
  • CUniform linear motion
  • DRandom motion under multiple forces
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Correct Answer: Option B — Oscillatory motion where restoring force is proportional to displacement
Explanation: Simple harmonic motion is a type of oscillatory motion where the restoring force is directly proportional to the displacement from equilibrium and directed toward the equilibrium position.
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360
Physics Medium

Which law explains why rockets can propel themselves in space?

  • ANewton's First Law
  • BNewton's Third Law
  • CBernoulli's Principle
  • DNewton's Second Law
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Correct Answer: Option B — Newton's Third Law
Explanation: Rockets work on Newton's Third Law as gases expelled backward at high speed produce an equal and opposite forward thrust allowing propulsion even in the vacuum of space.
Submitted by: PaperMCQs
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