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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

1,461 Questions
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301
Physics Hard

Which type of spectrum consists of specific discrete wavelengths emitted by excited atoms?

  • AContinuous spectrum
  • BLine emission spectrum
  • CAbsorption spectrum
  • DBand spectrum
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Correct Answer: Option B — Line emission spectrum
Explanation: A line emission spectrum consists of discrete bright lines at specific wavelengths produced when electrons in excited atoms fall to lower energy levels releasing photons of specific energies.
Submitted by: PaperMCQs
302
Physics Easy

Which process transfers heat through the movement of fluid currents?

  • AConvection
  • BConduction
  • CRadiation
  • DSublimation
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Correct Answer: Option A — Convection
Explanation: Convection transfers heat through the movement of fluids as warmer less dense fluid rises and cooler denser fluid sinks creating convection currents that distribute thermal energy.
Submitted by: PaperMCQs
303
Physics Hard

What is the phenomenon of resonance in physics?

  • AIncrease in amplitude when driving frequency matches natural frequency
  • BDecrease in amplitude of oscillations over time
  • CThe bending of waves around obstacles
  • DSplitting of white light into colours
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Correct Answer: Option A — Increase in amplitude when driving frequency matches natural frequency
Explanation: Resonance occurs when a system is driven at its natural frequency causing the amplitude of oscillations to increase dramatically and can be seen in musical instruments and bridges.
Submitted by: PaperMCQs
304
Physics Hard

Which type of mirror is used in reflecting telescopes?

  • APlane mirror
  • BParabolic concave mirror
  • CConvex mirror
  • DCylindrical mirror
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Correct Answer: Option B — Parabolic concave mirror
Explanation: Reflecting telescopes use parabolic concave mirrors to collect and focus parallel rays of light from distant stars to a single focal point without chromatic aberration.
Submitted by: PaperMCQs
305
Physics Medium

Which phenomenon explains why objects appear to weigh less when submerged in water?

  • ASurface tension
  • BBuoyancy
  • CCohesion
  • DAdhesion
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Correct Answer: Option B — Buoyancy
Explanation: Buoyancy is the upward force exerted by a fluid on a submerged object equal to the weight of fluid displaced making objects appear lighter as described by Archimedes' Principle.
Submitted by: PaperMCQs
306
Physics Easy

What is the SI unit of pressure?

  • ANewton
  • BJoule
  • CPascal
  • DWatt
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Correct Answer: Option C — Pascal
Explanation: The Pascal is the SI unit of pressure named after Blaise Pascal and defined as one Newton of force per square metre of area.
Submitted by: PaperMCQs
307
Physics Medium

What is the working principle of a hydraulic press?

  • APascal's law
  • BArchimedes' principle
  • CBernoulli's principle
  • DNewton's third law
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Correct Answer: Option A — Pascal's law
Explanation: A hydraulic press works on Pascal's Law where pressure applied to an enclosed fluid is transmitted equally in all directions allowing a small force to generate a much larger force.
Submitted by: PaperMCQs
308
Physics Hard

Which effect causes the apparent change in frequency of light from a moving star?

  • APhotoelectric effect
  • BCompton effect
  • CZeeman effect
  • DDoppler effect
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Correct Answer: Option D — Doppler effect
Explanation: The Doppler effect causes light from a star moving away from us to shift to longer wavelengths called red shift while light from an approaching star shifts to shorter wavelengths called blue shift.
Submitted by: PaperMCQs
309
Physics Medium

What is the relationship between work done and force in the direction of displacement?

  • AWork equals force times displacement
  • BWork equals force plus displacement
  • CWork equals force times time
  • DWork equals force divided by displacement
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Correct Answer: Option A — Work equals force times displacement
Explanation: Work done is defined as the force applied multiplied by the displacement in the direction of that force expressed as W equals Fd where both force and displacement must be in the same direction.
Submitted by: PaperMCQs
310
Physics Medium

Which type of energy is stored in a compressed spring?

  • AKinetic energy
  • BThermal energy
  • CElastic potential energy
  • DChemical energy
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Correct Answer: Option C — Elastic potential energy
Explanation: A compressed spring stores elastic potential energy due to the deformation of its molecular structure and this energy is released as kinetic energy when the spring is allowed to expand.
Submitted by: PaperMCQs
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