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Physics

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11. Oil or soap film when in daylight appears coloured because of
 
  • A. reflection
  • B. refraction
  • C. interference
  • D. surface energy
 
12. A woman’s voice is shriller than man’s voice due to
 
  • A. lower frequency
  • B. higher frequency
  • C. weak vocal chords
  • D. higher amplitude
 
13. Recording of sound on tapes was first invented by
 
  • A. Fleming
  • B. Ampere
  • C. Poulsen
  • D. Becquerrel
 
 
14. Which one of the following would be most powerful electro magnet?
 
  • A. soft iron
  • B. steel
  • C. copper
  • D. air
 
15. Production of beats is a result of the phenomenon of
 
  • A. reflection
  • B. resonance
  • C. interference
  • D. superposition