6. The isotopes that emit
radiations are used
as radioactive traces in medical science
(1) B-radiations
(2) y-radiations
(3) a-radiations
(4) All the three
7. The electromagnetic radiations used for taking
photographs of objects in dark
(1) X-rays
(2) Infra-red rays
(3) y-rays
(4) UV rays
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