Which of the following rays are used in the diagnosis of intestinal diseases?

Which of the following rays/waves are used to know the growth of fetus in the womb?

Which one of the following is not a property of the X-rays?

Which one of the following types of waves are used in a Night vision apparatus?

Which one of the following is used for determining the structure of crystal?

Which one of the following statements about X-rays is not true ?