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CSS MCQs

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51 Questions
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11
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
12
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
13
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
14
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
15
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
16
Physics Hard

What is the unit of luminous intensity in the SI system?

  • ALux
  • BLumen
  • CWatt
  • DCandela
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Correct Answer: Option D — Candela
Explanation: The Candela is the SI base unit of luminous intensity representing the power emitted by a light source in a particular direction per unit solid angle.
Submitted by: PaperMCQs
17
Physics Hard

What is polarisation of light?

  • ASplitting light into its spectrum
  • BRestriction of light vibrations to a single plane
  • CBending of light around obstacles
  • DTotal reflection of light
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Correct Answer: Option B — Restriction of light vibrations to a single plane
Explanation: Polarisation restricts the transverse vibrations of light to a single plane demonstrating that light is a transverse wave and is used in polaroid sunglasses and LCD screens.
Submitted by: PaperMCQs
18
Physics Medium

Which experiment demonstrated that light behaves as a wave by producing an interference pattern?

  • AYoung's double slit experiment
  • BRutherford's gold foil experiment
  • CMillikan's oil drop experiment
  • DCompton scattering experiment
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Correct Answer: Option A — Young's double slit experiment
Explanation: Young's double slit experiment demonstrated light's wave nature by producing alternating bright and dark fringes on a screen when coherent light passed through two closely spaced slits.
Submitted by: PaperMCQs
19
Physics Medium

What is the phenomenon where two waves superpose to produce regions of maximum and minimum intensity?

  • AInterference
  • BDiffraction
  • CRefraction
  • DPolarisation
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Correct Answer: Option A — Interference
Explanation: Interference occurs when two coherent waves superpose to produce alternating regions of constructive interference maximum intensity and destructive interference minimum intensity.
Submitted by: PaperMCQs
20
Physics Hard

Which device uses the piezoelectric effect to produce ultrasonic waves?

  • ALoudspeaker
  • BMicrophone
  • CElectric motor
  • DUltrasonic transducer
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Correct Answer: Option D — Ultrasonic transducer
Explanation: An ultrasonic transducer uses the piezoelectric effect where certain crystals generate mechanical vibrations when an electric voltage is applied producing high frequency sound waves.
Submitted by: PaperMCQs
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