Choose the word which is different from the rest.
...In the question below, five words have been given, out of which four are alike in some manner, while the fifth one is different. Choose the word which is different from the rest.
Choose the word which is different from the rest.
Telescope
Periscope
Microphone
Bioscope
Kaleidoscope
Correct answer is C
All except Microphone are instruments based on theories and principles of light.