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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

1,461 Questions
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371
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
372
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
373
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
374
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
375
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
376
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
377
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
378
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
379
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
380
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
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