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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

99 Questions
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21
Physics Medium

What is the principle behind a periscope?

  • AReflection of light using two parallel mirrors
  • BDiffraction of light
  • CRefraction through lenses
  • DPolarisation of light
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Correct Answer: Option A — Reflection of light using two parallel mirrors
Explanation: A periscope uses two parallel mirrors inclined at 45 degrees to reflect light allowing observation above or around obstacles without direct line of sight.
Submitted by: PaperMCQs
22
Physics Easy

Which device is used to measure the electric current flowing through a circuit?

  • AVoltmeter
  • BOhmmeter
  • CGalvanometer
  • DAmmeter
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Correct Answer: Option D — Ammeter
Explanation: An ammeter is connected in series in a circuit to measure the electric current flowing through it and is designed with very low internal resistance to minimise circuit disturbance.
Submitted by: PaperMCQs
23
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
24
Physics Hard

What is the unit of magnetic flux in the SI system?

  • ATesla
  • BWeber
  • CAmpere
  • DFarad
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Correct Answer: Option B — Weber
Explanation: The Weber is the SI unit of magnetic flux named after Wilhelm Eduard Weber and defined as the magnetic flux that when reduced to zero uniformly in one second induces an EMF of one volt.
Submitted by: PaperMCQs
25
Physics Hard

Which effect describes the change in wavelength of X-rays scattered by electrons?

  • APhotoelectric effect
  • BCompton effect
  • CZeeman effect
  • DHall effect
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Correct Answer: Option B — Compton effect
Explanation: The Compton effect describes the increase in wavelength of X-rays or gamma rays when they scatter off electrons demonstrating the particle nature of electromagnetic radiation.
Submitted by: PaperMCQs
26
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
27
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
28
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
29
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
30
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
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