Multiple choice

Which of the following statements is/are correct?

  1. Infrared radiations are used as signals during war.
  2. Roentgen discovered the X–rays.
  3. Periscope, an instrument, produces multiple reflections of coloured glass pieces and creates beautiful patterns.

  1. Only (1)

  2. Only (2)

  3. Only (1) and (2)

  4. Only (2) and (3)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (1) is correct. Infrared radiations are used as signals during war as they are not visible, and they are not absorbed much in a medium.

Statement (2) is correct. A German physicist, W. C. Roentgen discovered the X–rays. Statement (3) is wrong. Kaleidoscope, an instrument, produces multiple reflections of coloured glass pieces and creates beautiful patterns.

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