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Q: Which device is used in submarines to see things above the level of the sea ?
  • A. Pyrometer
  • B. Epidiascope
  • C. Periscope
  • D. Odometer
Correct Answer: Option C - Submarines have a special device called a periscope that allows people inside the submarine to see what's going on above the level of sea. The main part of a periscope is a long tube that has a mirror at each end. The mirrors are attached so that they are parallel to each other at a 45-degree angle. Arranged in this way, the mirrors bounce reflection of light between them.
C. Submarines have a special device called a periscope that allows people inside the submarine to see what's going on above the level of sea. The main part of a periscope is a long tube that has a mirror at each end. The mirrors are attached so that they are parallel to each other at a 45-degree angle. Arranged in this way, the mirrors bounce reflection of light between them.

Explanations:

Submarines have a special device called a periscope that allows people inside the submarine to see what's going on above the level of sea. The main part of a periscope is a long tube that has a mirror at each end. The mirrors are attached so that they are parallel to each other at a 45-degree angle. Arranged in this way, the mirrors bounce reflection of light between them.