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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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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
71
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
72
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
73
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
74
Physics Medium

Which law of thermodynamics states that energy cannot be created or destroyed only converted from one form to another?

  • AZeroth Law
  • BSecond Law
  • CThird Law
  • DFirst Law
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Correct Answer: Option D — First Law
Explanation: The First Law of Thermodynamics also known as the Law of Conservation of Energy states that energy cannot be created or destroyed but only converted from one form to another.
Submitted by: PaperMCQs
75
Physics Easy

What is the unit of power in the SI system?

  • AWatt
  • BJoule
  • CNewton
  • DPascal
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Correct Answer: Option A — Watt
Explanation: The Watt is the SI unit of power named after James Watt and defined as one joule of energy transferred or converted per second.
Submitted by: PaperMCQs
76
Physics Easy

Which property of a body is measured by the amount of matter it contains?

  • AWeight
  • BDensity
  • CMass
  • DVolume
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Correct Answer: Option C — Mass
Explanation: Mass is the measure of the amount of matter contained in a body and remains constant regardless of location unlike weight which depends on gravitational field strength.
Submitted by: PaperMCQs
77
Physics Easy

What is the SI unit of energy?

  • AJoule
  • BWatt
  • CNewton
  • DPascal
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Correct Answer: Option A — Joule
Explanation: The Joule is the SI unit of energy defined as the work done when a force of one Newton moves an object one metre in the direction of the force.
Submitted by: PaperMCQs
78
Physics Medium

Which law states that the current through a conductor is directly proportional to the voltage across it?

  • AFaraday's Law
  • BOhm's Law
  • CKirchhoff's Law
  • DCoulomb's Law
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Correct Answer: Option B — Ohm's Law
Explanation: Ohm's Law states that the current I through a conductor is directly proportional to the voltage V across it at constant temperature expressed as V equals IR.
Submitted by: PaperMCQs
79
Physics Easy

What is the unit of electrical resistance?

  • AVolt
  • BAmpere
  • CWatt
  • DOhm
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Correct Answer: Option D — Ohm
Explanation: The Ohm named after German physicist Georg Simon Ohm is the SI unit of electrical resistance defined as the resistance that produces a potential difference of one volt per ampere.
Submitted by: PaperMCQs
80
Physics Easy

Which physical quantity is defined as force per unit area?

  • ADensity
  • BPressure
  • CStress
  • DTorque
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Correct Answer: Option B — Pressure
Explanation: Pressure is defined as force per unit area measured in Pascals in the SI system and applies to fluids and gases exerting force on surfaces equally in all directions.
Submitted by: PaperMCQs
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