Which one is an od trm? Give a reason for your choice.

  1. chemistry, history, botany, zoology
  2. microscope, periscope, cine projector, thermometer
  3. transistor,television, cell phone, washing machne

history : Not a branch of science

thermometer : All the other are optical instruments (Dealing with light)

Washing machine : All other are communicating instruments.

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