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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

1,262 Questions
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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
391
Physics Medium

Which scientist formulated the law of universal gravitation?

  • AGalileo Galilei
  • BIsaac Newton
  • CMichael Faraday
  • DJames Clerk Maxwell
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Correct Answer: Option B — Isaac Newton
Explanation: Isaac Newton formulated the law of universal gravitation in 1687 stating that every mass attracts every other mass with a force proportional to their masses and inversely proportional to the square of the distance.
Submitted by: PaperMCQs
392
Physics Medium

What is the formula for gravitational potential energy?

  • Ahalf mv squared
  • Bmgh
  • CFxd
  • Dmv
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Correct Answer: Option B — mgh
Explanation: Gravitational potential energy is calculated as mass multiplied by gravitational acceleration multiplied by height expressed as PE equals mgh where g is approximately 9.8 m/s squared.
Submitted by: PaperMCQs
393
Physics Medium

What is the formula for kinetic energy?

  • Amv
  • Bmgh
  • Chalf mv squared
  • DFxd
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Correct Answer: Option C — half mv squared
Explanation: Kinetic energy is calculated using the formula KE equals half multiplied by mass multiplied by velocity squared showing that kinetic energy increases with the square of speed.
Submitted by: PaperMCQs
394
Physics Medium

Which colour of visible light has the shortest wavelength?

  • ARed
  • BViolet
  • COrange
  • DYellow
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Correct Answer: Option B — Violet
Explanation: Violet light has the shortest wavelength in the visible spectrum at approximately 380 to 450 nanometres and therefore the highest frequency and energy among visible colours.
Submitted by: PaperMCQs
395
Physics Medium

Which colour of visible light has the longest wavelength?

  • ARed
  • BViolet
  • CBlue
  • DGreen
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Correct Answer: Option A — Red
Explanation: Red light has the longest wavelength in the visible spectrum at approximately 620 to 750 nanometres while violet has the shortest wavelength.
Submitted by: PaperMCQs
396
Physics Easy

What type of lens is thicker at the centre than at the edges?

  • AConcave lens
  • BPlano-concave lens
  • CBiconcave lens
  • DConvex lens
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Correct Answer: Option D — Convex lens
Explanation: A convex lens also called a converging lens is thicker at the centre than at the edges and brings parallel rays of light to a focus at a point called the focal point.
Submitted by: PaperMCQs
397
Physics Medium

What is the process by which a solid changes directly into a gas without passing through the liquid phase?

  • AEvaporation
  • BSublimation
  • CCondensation
  • DVaporisation
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Correct Answer: Option B — Sublimation
Explanation: Sublimation is the direct phase transition from solid to gas without passing through the liquid state as demonstrated by dry ice converting to carbon dioxide gas.
Submitted by: PaperMCQs
398
Physics Medium

Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

  • ARefraction
  • BReflection
  • CDiffraction
  • DDispersion
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Correct Answer: Option C — Diffraction
Explanation: Diffraction is the bending of light waves around the edges of an obstacle or through an aperture and is most noticeable when the obstacle size is comparable to the wavelength.
Submitted by: PaperMCQs
399
Physics Easy

What is the SI unit of frequency?

  • AWatt
  • BNewton
  • CPascal
  • DHertz
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Correct Answer: Option D — Hertz
Explanation: Hertz is the SI unit of frequency representing the number of cycles or oscillations per second and is named after German physicist Heinrich Hertz.
Submitted by: PaperMCQs
400
Physics Medium

Which law of thermodynamics states that heat naturally flows from a hotter body to a cooler body?

  • AFirst Law
  • BZeroth Law
  • CSecond Law
  • DThird Law
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Correct Answer: Option C — Second Law
Explanation: The Second Law of Thermodynamics states that heat naturally flows from a hot body to a cooler one and entropy of an isolated system tends to increase over time.
Submitted by: PaperMCQs
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