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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.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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331
Physics Medium

Which law states that planets move in elliptical orbits with the sun at one focus?

  • ANewton's Law of Gravitation
  • BGalileo's Law of Motion
  • CKepler's First Law
  • DHubble's Law
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Correct Answer: Option C — Kepler's First Law
Explanation: Kepler's First Law of Planetary Motion states that all planets orbit the sun in elliptical paths with the sun located at one of the two foci of the ellipse.
Submitted by: PaperMCQs
332
Physics Medium

What is the centripetal force?

  • AForce pushing an object outward in circular motion
  • BForce causing linear acceleration
  • CForce equal to mass times velocity
  • DForce directed toward the centre of circular motion
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Correct Answer: Option D — Force directed toward the centre of circular motion
Explanation: Centripetal force is the force directed toward the centre of circular motion that keeps an object moving in a curved path and is provided by tension gravity or friction depending on the situation.
Submitted by: PaperMCQs
333
Physics Medium

What is the terminal velocity of a falling object?

  • AMinimum speed during fall
  • BSpeed at which object first starts moving
  • CSpeed independent of mass
  • DMaximum speed reached when weight equals air resistance
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Correct Answer: Option D — Maximum speed reached when weight equals air resistance
Explanation: Terminal velocity is the constant maximum speed reached by a falling object when the downward gravitational force equals the upward air resistance force resulting in zero net force.
Submitted by: PaperMCQs
334
Physics Hard

Which type of spectrum consists of specific discrete wavelengths emitted by excited atoms?

  • AContinuous spectrum
  • BLine emission spectrum
  • CAbsorption spectrum
  • DBand spectrum
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Correct Answer: Option B — Line emission spectrum
Explanation: A line emission spectrum consists of discrete bright lines at specific wavelengths produced when electrons in excited atoms fall to lower energy levels releasing photons of specific energies.
Submitted by: PaperMCQs
335
Physics Easy

Which process transfers heat through the movement of fluid currents?

  • AConvection
  • BConduction
  • CRadiation
  • DSublimation
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Correct Answer: Option A — Convection
Explanation: Convection transfers heat through the movement of fluids as warmer less dense fluid rises and cooler denser fluid sinks creating convection currents that distribute thermal energy.
Submitted by: PaperMCQs
336
Physics Hard

What is the phenomenon of resonance in physics?

  • AIncrease in amplitude when driving frequency matches natural frequency
  • BDecrease in amplitude of oscillations over time
  • CThe bending of waves around obstacles
  • DSplitting of white light into colours
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Correct Answer: Option A — Increase in amplitude when driving frequency matches natural frequency
Explanation: Resonance occurs when a system is driven at its natural frequency causing the amplitude of oscillations to increase dramatically and can be seen in musical instruments and bridges.
Submitted by: PaperMCQs
337
Physics Hard

Which type of mirror is used in reflecting telescopes?

  • APlane mirror
  • BParabolic concave mirror
  • CConvex mirror
  • DCylindrical mirror
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Correct Answer: Option B — Parabolic concave mirror
Explanation: Reflecting telescopes use parabolic concave mirrors to collect and focus parallel rays of light from distant stars to a single focal point without chromatic aberration.
Submitted by: PaperMCQs
338
Physics Medium

Which phenomenon explains why objects appear to weigh less when submerged in water?

  • ASurface tension
  • BBuoyancy
  • CCohesion
  • DAdhesion
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Correct Answer: Option B — Buoyancy
Explanation: Buoyancy is the upward force exerted by a fluid on a submerged object equal to the weight of fluid displaced making objects appear lighter as described by Archimedes' Principle.
Submitted by: PaperMCQs
339
Physics Easy

What is the SI unit of pressure?

  • ANewton
  • BJoule
  • CPascal
  • DWatt
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Correct Answer: Option C — Pascal
Explanation: The Pascal is the SI unit of pressure named after Blaise Pascal and defined as one Newton of force per square metre of area.
Submitted by: PaperMCQs
340
Physics Medium

What is the working principle of a hydraulic press?

  • APascal's law
  • BArchimedes' principle
  • CBernoulli's principle
  • DNewton's third law
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Correct Answer: Option A — Pascal's law
Explanation: A hydraulic press works on Pascal's Law where pressure applied to an enclosed fluid is transmitted equally in all directions allowing a small force to generate a much larger force.
Submitted by: PaperMCQs
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