Multiple choice

What of the following is not correct about background radiation?

  1. They are radiations to which we all are exposed even in the absence of visible radioactive sources.

  2. Radium, K-40 and C-14 are some of the sources of these radiations.

  3. They cause serious biological damage to us.

  4. Gamma radiations come from the radioactive rocks in the earth's crust.

  5. They do not exceed the maximum permissible level for human safety.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The background radiations do not cause serious biological damage to us because they do not exceed the maximum permissible level for human safety.

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