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Which instrument is used in submarine to see the objects above sea level ?

  • Pykometer
  • Polygraph
  • Photometer
  • Periscope

Answer: Option D

Explanation:

Pykometer - used to determine the density and coefficient of expansion of liquids,

Polygraph - used to record changes in heartbeat, blood-pressure and respiration,

Photometer - used to compare luminous intensity of the source of light.

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