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CSS MCQs

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51 Questions
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21
Physics Medium

What is simple harmonic motion?

  • AMotion in a circle at constant speed
  • BOscillatory motion where restoring force is proportional to displacement
  • CUniform linear motion
  • DRandom motion under multiple forces
Permalink
Correct Answer: Option B — Oscillatory motion where restoring force is proportional to displacement
Explanation: Simple harmonic motion is a type of oscillatory motion where the restoring force is directly proportional to the displacement from equilibrium and directed toward the equilibrium position.
Submitted by: PaperMCQs
22
Physics Hard

Which phenomenon causes a spinning top to precess rather than fall over immediately?

  • AConservation of energy
  • BMagnetic force
  • CGyroscopic effect
  • DCentripetal force only
Permalink
Correct Answer: Option C — Gyroscopic effect
Explanation: The gyroscopic effect causes a spinning top to precess slowly around a vertical axis rather than falling over because its angular momentum resists changes to its orientation.
Submitted by: PaperMCQs
23
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
24
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
25
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
26
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
Permalink
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
27
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
Permalink
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
28
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
29
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
30
Physics Medium

Which type of radiation has the highest penetrating power?

  • AAlpha radiation
  • BGamma radiation
  • CBeta radiation
  • DNeutron radiation
Permalink
Correct Answer: Option B — Gamma radiation
Explanation: Gamma radiation is highly penetrating electromagnetic radiation that can pass through most materials and requires dense materials like thick lead or concrete for adequate shielding.
Submitted by: PaperMCQs
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