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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

86 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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61
Physics Medium

Which device converts electrical energy into mechanical energy?

  • AGenerator
  • BTransformer
  • CElectric motor
  • DCapacitor
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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
62
Physics Medium

Which device converts mechanical energy into electrical energy?

  • AMotor
  • BTransformer
  • CGenerator
  • DBattery
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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
63
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
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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
64
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
65
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
66
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
67
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
68
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
69
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
70
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
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