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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

99 Questions
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71
Physics Hard

What is the unit of magnetic flux density?

  • ATesla
  • BWeber
  • CHenry
  • DFarad
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Correct Answer: Option A — Tesla
Explanation: Tesla is the SI unit of magnetic flux density or magnetic field strength representing one weber of magnetic flux per square metre.
Submitted by: PaperMCQs
72
Physics Hard

Which phenomenon explains the formation of mirages in deserts?

  • AReflection of light
  • BDiffraction of light
  • CTotal internal reflection due to air density layers
  • DDispersion of light
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Correct Answer: Option C — Total internal reflection due to air density layers
Explanation: Mirages form due to total internal reflection when light rays from the sky refract through layers of air with varying temperature and density creating the illusion of water on the ground.
Submitted by: PaperMCQs
73
Physics Hard

What is the angle of incidence when a ray of light undergoes total internal reflection?

  • ALess than the critical angle
  • BEqual to 90 degrees
  • CGreater than the critical angle
  • DEqual to 45 degrees
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Correct Answer: Option C — Greater than the critical angle
Explanation: Total internal reflection occurs when light travels from a denser to a rarer medium and the angle of incidence exceeds the critical angle causing all light to be reflected back.
Submitted by: PaperMCQs
74
Physics Medium

Which device converts electrical energy into mechanical energy?

  • AGenerator
  • BTransformer
  • CElectric motor
  • DCapacitor
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Correct Answer: Option C — Electric motor
Explanation: An electric motor converts electrical energy into mechanical energy using the interaction between electric current and a magnetic field to produce rotational motion.
Submitted by: PaperMCQs
75
Physics Medium

Which device converts mechanical energy into electrical energy?

  • AMotor
  • BTransformer
  • CGenerator
  • DBattery
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Correct Answer: Option C — Generator
Explanation: A generator converts mechanical energy into electrical energy through electromagnetic induction as a rotating coil moves within a magnetic field inducing an electric current.
Submitted by: PaperMCQs
76
Physics Easy

What is the acceleration due to gravity at the surface of the Earth?

  • A8.9 m/s squared
  • B10.8 m/s squared
  • C9.8 m/s squared
  • D7.8 m/s squared
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Correct Answer: Option C — 9.8 m/s squared
Explanation: The standard acceleration due to gravity at the Earth's surface is approximately 9.8 metres per second squared commonly rounded to 10 m/s squared in simple calculations.
Submitted by: PaperMCQs
77
Physics Medium

Which scientist formulated the law of universal gravitation?

  • AGalileo Galilei
  • BIsaac Newton
  • CMichael Faraday
  • DJames Clerk Maxwell
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Correct Answer: Option B — Isaac Newton
Explanation: Isaac Newton formulated the law of universal gravitation in 1687 stating that every mass attracts every other mass with a force proportional to their masses and inversely proportional to the square of the distance.
Submitted by: PaperMCQs
78
Physics Medium

What is the formula for gravitational potential energy?

  • Ahalf mv squared
  • Bmgh
  • CFxd
  • Dmv
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Correct Answer: Option B — mgh
Explanation: Gravitational potential energy is calculated as mass multiplied by gravitational acceleration multiplied by height expressed as PE equals mgh where g is approximately 9.8 m/s squared.
Submitted by: PaperMCQs
79
Physics Medium

What is the formula for kinetic energy?

  • Amv
  • Bmgh
  • Chalf mv squared
  • DFxd
Permalink
Correct Answer: Option C — half mv squared
Explanation: Kinetic energy is calculated using the formula KE equals half multiplied by mass multiplied by velocity squared showing that kinetic energy increases with the square of speed.
Submitted by: PaperMCQs
80
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
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