Class VIII

Microphone is used to convert
  1. sound waves into electrical energy
  2. . sound waves into light rays
  3. electrical energy into sound waves
  4. D. sound waves into magnetic currents
Until Victorian times, chocolate was thought of as a drink. When did the first chocolate bar appear ?
  1. 1828
  2. 1831
  3. 1825
  4. There is no sure date
When were bar code scanners invented?
  1. 1940s
  2. 1950s
  3. 1970s
  4. 1960s
What Henry Bessemer invented?
  1. Aluminum
  2. Electroplating
  3. Steel Converter
  4. Steel rolling mill
Who invented Bifocal Lens?
  1. Alfred B. Nobel
  2. Thomas Alva Edison
  3. Benjamin Franklin
  4. Rudolf Diesel
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