Classification

Directions to SolveIn each of the following questions, four words have been given out of which three are alike in some manner, while the fourth one is different. Choose the word which is different from the rest.

Choose the word which is different from the rest.

A Microscope

B Telescope

C Periscope

D Stethoscope

ANS:D - Stethoscope

Explanation: All except Stethoscope are optical instruments.

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