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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

99 Questions
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31
Physics Medium

Which law states that the pressure of a gas is inversely proportional to its volume at constant temperature?

  • ABoyle's Law
  • BCharles's Law
  • CAvogadro's Law
  • DGay-Lussac's Law
Permalink
Correct Answer: Option A — Boyle's Law
Explanation: Boyle's Law states that at constant temperature the pressure of a fixed amount of gas is inversely proportional to its volume meaning doubling pressure halves the volume.
Submitted by: PaperMCQs
32
Physics Hard

What is the unit of luminous intensity in the SI system?

  • ALux
  • BLumen
  • CWatt
  • DCandela
Permalink
Correct Answer: Option D — Candela
Explanation: The Candela is the SI base unit of luminous intensity representing the power emitted by a light source in a particular direction per unit solid angle.
Submitted by: PaperMCQs
33
Physics Medium

Which type of spectrum is produced when white light passes through a prism?

  • ALine emission spectrum
  • BContinuous spectrum
  • CBand spectrum
  • DAbsorption spectrum
Permalink
Correct Answer: Option B — Continuous spectrum
Explanation: A prism produces a continuous spectrum showing a smooth gradation from red to violet as white light is dispersed into its component wavelengths through refraction.
Submitted by: PaperMCQs
34
Physics Hard

What is polarisation of light?

  • ASplitting light into its spectrum
  • BRestriction of light vibrations to a single plane
  • CBending of light around obstacles
  • DTotal reflection of light
Permalink
Correct Answer: Option B — Restriction of light vibrations to a single plane
Explanation: Polarisation restricts the transverse vibrations of light to a single plane demonstrating that light is a transverse wave and is used in polaroid sunglasses and LCD screens.
Submitted by: PaperMCQs
35
Physics Medium

Which experiment demonstrated that light behaves as a wave by producing an interference pattern?

  • AYoung's double slit experiment
  • BRutherford's gold foil experiment
  • CMillikan's oil drop experiment
  • DCompton scattering experiment
Permalink
Correct Answer: Option A — Young's double slit experiment
Explanation: Young's double slit experiment demonstrated light's wave nature by producing alternating bright and dark fringes on a screen when coherent light passed through two closely spaced slits.
Submitted by: PaperMCQs
36
Physics Medium

What is the phenomenon where two waves superpose to produce regions of maximum and minimum intensity?

  • AInterference
  • BDiffraction
  • CRefraction
  • DPolarisation
Permalink
Correct Answer: Option A — Interference
Explanation: Interference occurs when two coherent waves superpose to produce alternating regions of constructive interference maximum intensity and destructive interference minimum intensity.
Submitted by: PaperMCQs
37
Physics Hard

Which device uses the piezoelectric effect to produce ultrasonic waves?

  • ALoudspeaker
  • BMicrophone
  • CElectric motor
  • DUltrasonic transducer
Permalink
Correct Answer: Option D — Ultrasonic transducer
Explanation: An ultrasonic transducer uses the piezoelectric effect where certain crystals generate mechanical vibrations when an electric voltage is applied producing high frequency sound waves.
Submitted by: PaperMCQs
38
Physics Medium

What is simple harmonic motion?

  • AMotion in a circle at constant speed
  • BOscillatory motion where restoring force is proportional to displacement
  • CUniform linear motion
  • DRandom motion under multiple forces
Permalink
Correct Answer: Option B — Oscillatory motion where restoring force is proportional to displacement
Explanation: Simple harmonic motion is a type of oscillatory motion where the restoring force is directly proportional to the displacement from equilibrium and directed toward the equilibrium position.
Submitted by: PaperMCQs
39
Physics Hard

Which phenomenon causes a spinning top to precess rather than fall over immediately?

  • AConservation of energy
  • BMagnetic force
  • CGyroscopic effect
  • DCentripetal force only
Permalink
Correct Answer: Option C — Gyroscopic effect
Explanation: The gyroscopic effect causes a spinning top to precess slowly around a vertical axis rather than falling over because its angular momentum resists changes to its orientation.
Submitted by: PaperMCQs
40
Physics Hard

What is the escape velocity from Earth's surface approximately?

  • A11.2 km/s
  • B7.9 km/s
  • C5.5 km/s
  • D15 km/s
Permalink
Correct Answer: Option A — 11.2 km/s
Explanation: The escape velocity from Earth's surface is approximately 11.2 kilometres per second the minimum speed needed for an object to escape Earth's gravitational pull without further propulsion.
Submitted by: PaperMCQs
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