Multiple choice

Consider the following statements:

(1) The photocopy machines emit UV radiations which can cause eye problems. (2) UV radiations can be used to determine the temperature of objects, which is known as thermography. (3) CT scan uses computer processed X- rays and generates a three dimensional image of specific areas of the body.

Which of the given statements is/are true?

  1. Only (1)

  2. Only (2)

  3. Only (1) and (3)

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

Statement (1) is correct. The photocopy machines emit UV radiations, which can cause eye problems.

Statement (2) is wrong. Infrared thermography (IRT), thermal imaging and thermal video are examples of infrared imaging science. Thermographic cameras usually detect radiation in the long-infrared range of the electromagnetic spectrum (roughly 9,000–14,000 nanometers or 9–14 µm) and produce images of that radiation, called thermograms. Statement (3) is correct. CT scan uses computer processed X- rays and generates a three dimensional image of specific areas of the body.
 

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