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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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21
Physics Easy

Which device is used to measure the potential difference between two points in a circuit?

  • AAmmeter
  • BVoltmeter
  • CGalvanometer
  • DOhmmeter
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Correct Answer: Option B — Voltmeter
Explanation: A voltmeter is connected in parallel across two points in a circuit to measure the potential difference or voltage between them and has a very high internal resistance.
Submitted by: PaperMCQs
22
Physics Medium

What does Einstein's mass-energy equivalence equation state?

  • AE equals mv squared
  • BE equals mc squared
  • CE equals half mc squared
  • DE equals mc
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Correct Answer: Option B — E equals mc squared
Explanation: Einstein's famous equation E equals mc squared states that mass m and energy E are interchangeable with c being the speed of light showing that small masses contain enormous energy.
Submitted by: PaperMCQs
23
Physics Easy

What is the speed of light in a vacuum?

  • A3 x 10 to the power 6 m/s
  • B3 x 10 to the power 10 m/s
  • C3 x 10 to the power 4 m/s
  • D3 x 10 to the power 8 m/s
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Correct Answer: Option D — 3 x 10 to the power 8 m/s
Explanation: The speed of light in a vacuum is approximately 3 x 10 to the power of 8 metres per second or 300000 kilometres per second and is denoted by the letter c.
Submitted by: PaperMCQs
24
Physics Medium

Which scale of temperature is used in thermodynamic calculations and starts at absolute zero?

  • AKelvin
  • BCelsius
  • CFahrenheit
  • DRankine
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Correct Answer: Option A — Kelvin
Explanation: The Kelvin scale is the SI thermodynamic temperature scale starting at absolute zero and used in all scientific thermodynamic calculations because it has no negative values.
Submitted by: PaperMCQs
25
Physics Medium

What is absolute zero temperature in degrees Celsius?

  • A0 degrees Celsius
  • Bminus 100 degrees Celsius
  • Cminus 273 degrees Celsius
  • Dminus 373 degrees Celsius
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Correct Answer: Option C — minus 273 degrees Celsius
Explanation: Absolute zero is minus 273.15 degrees Celsius or 0 Kelvin the theoretical lowest temperature at which particles have minimum thermal motion.
Submitted by: PaperMCQs
26
Physics Medium

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

  • ACharles's Law
  • BBoyle's Law
  • CAvogadro's Law
  • DGay-Lussac's Law
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Correct Answer: Option A — Charles's Law
Explanation: Charles's Law states that at constant pressure the volume of a fixed amount of gas is directly proportional to its absolute temperature in Kelvin.
Submitted by: PaperMCQs
27
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
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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
28
Physics Medium

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

  • ALine emission spectrum
  • BContinuous spectrum
  • CBand spectrum
  • DAbsorption spectrum
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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
29
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
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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
30
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
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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
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