Question

What does the unit "Becquerel (Bq)" define?

• A. The activity of a pathogenic material.
• B. The activity of a radio-active material.
• C. The activity of a chemical material.
• D. A hardness of material.

Hint:

Associate units with their quantities:

\textbf{Becquerel (Bq)} or \textbf{Curie (Ci)} $\rightarrow$ Radioactivity.
\textbf{Gray (Gy)} or \textbf{Rad} $\rightarrow$ Absorbed dose of radiation.
\textbf{Sievert (Sv)} or \textbf{Rem} $\rightarrow$ Equivalent dose (biological effect) of radiation.

Answer 1

The Correct Option is B

Step 1: Recall the definition of the Becquerel unit. Step 1: The Becquerel (Bq) is the SI derived unit of radioactivity.
Step 2: Relate the definition to the options.
Step 2: By definition, one Becquerel is the activity of a quantity of radioactive material in which one nucleus decays per second. This directly relates to the activity of a radioactive material.
Step 3: Eliminate other options.
Step 3:

Pathogenic activity relates to disease-causing ability, not measured in Bq.
Chemical activity is measured in terms of reaction rates or concentration (e.g., moles per liter).
Hardness is a physical property measured on scales like Mohs or Vickers.
Therefore, the only correct option is (B).