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FPSC MCQs

Federal Public Service Commission — Complete MCQ Bank

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331
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
332
Physics Medium

Which law explains why rockets can propel themselves in space?

  • ANewton's First Law
  • BNewton's Third Law
  • CBernoulli's Principle
  • DNewton's Second Law
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Correct Answer: Option B — Newton's Third Law
Explanation: Rockets work on Newton's Third Law as gases expelled backward at high speed produce an equal and opposite forward thrust allowing propulsion even in the vacuum of space.
Submitted by: PaperMCQs
333
Physics Medium

What is the principle of conservation of momentum?

  • AMomentum increases with velocity only
  • BTotal momentum of an isolated system remains constant
  • CMomentum equals mass times acceleration
  • DMomentum decreases with time
Permalink
Correct Answer: Option B — Total momentum of an isolated system remains constant
Explanation: The principle of conservation of momentum states that the total momentum of an isolated system remains constant provided no external forces act on it.
Submitted by: PaperMCQs
334
Physics Medium

Which principle explains why an aircraft wing generates lift?

  • APascal's principle
  • BBernoulli's principle
  • CArchimedes' principle
  • DNewton's first law only
Permalink
Correct Answer: Option B — Bernoulli's principle
Explanation: Bernoulli's principle explains that faster moving air over the curved upper wing surface has lower pressure than the slower air beneath creating a net upward lift force.
Submitted by: PaperMCQs
335
Physics Medium

What does a transformer do to alternating current?

  • AChanges the voltage of AC
  • BConverts AC to DC
  • CConverts DC to AC
  • DChanges the frequency of AC
Permalink
Correct Answer: Option A — Changes the voltage of AC
Explanation: A transformer changes the voltage of alternating current using electromagnetic induction between primary and secondary coils stepping voltage up or down depending on the turns ratio.
Submitted by: PaperMCQs
336
Physics Medium

Which formula correctly represents the relationship between frequency wavelength and speed of a wave?

  • Av equals f divided by wavelength
  • Bv equals wavelength divided by f
  • Cv equals f times wavelength
  • Df equals v times wavelength
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Correct Answer: Option C — v equals f times wavelength
Explanation: The wave equation states that wave speed v equals frequency f multiplied by wavelength lambda showing that for a given medium as frequency increases wavelength decreases proportionally.
Submitted by: PaperMCQs
337
Physics Hard

What is the critical angle in optics?

  • AAngle at which light travels along the boundary between two media
  • BAngle at which refraction stops
  • CAngle at which a lens focuses parallel rays
  • DAngle of maximum diffraction
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Correct Answer: Option A — Angle at which light travels along the boundary between two media
Explanation: The critical angle is the angle of incidence in the denser medium at which the refracted ray travels along the boundary and above which total internal reflection occurs.
Submitted by: PaperMCQs
338
Physics Medium

Which phenomenon explains why the sky appears blue?

  • AScattering of blue light by atmospheric molecules
  • BReflection of ocean colour
  • CAbsorption of blue light by clouds
  • DRefraction through ice crystals
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Correct Answer: Option A — Scattering of blue light by atmospheric molecules
Explanation: The sky appears blue due to Rayleigh scattering where shorter blue wavelengths of sunlight are scattered more strongly by atmospheric gas molecules than longer wavelength red light.
Submitted by: PaperMCQs
339
Physics Medium

What is the half-life of a radioactive substance?

  • ATime for the substance to completely decay
  • BTime for the radiation to halve in intensity only
  • CTime for half the nuclei to decay
  • DTime for temperature to reduce by half
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Correct Answer: Option C — Time for half the nuclei to decay
Explanation: Half-life is the time required for half of the radioactive nuclei in a sample to decay and it is a constant characteristic value specific to each radioactive isotope.
Submitted by: PaperMCQs
340
Physics Medium

Which type of radiation consists of helium nuclei emitted from an unstable nucleus?

  • AAlpha radiation
  • BBeta radiation
  • CGamma radiation
  • DNeutron radiation
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Correct Answer: Option A — Alpha radiation
Explanation: Alpha radiation consists of particles identical to helium-4 nuclei containing two protons and two neutrons emitted from heavy unstable nuclei during radioactive decay.
Submitted by: PaperMCQs
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