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Radioactivity is measured by _____________?

A) Barometer
B) Hygrometer
C) Geiger-Muller Counter
D) Ammeter

Correct Answer: C) Geiger-Muller Counter

Reason: The Geiger-Muller Counter (or Geiger Counter) is the most common instrument used to detect and measure **ionizing radiation** (radioactivity). Related MCQs: A Barometer measures atmospheric pressure. | A Hygrometer measures humidity. | An Ammeter measures electric current. | The Geiger Counter works by counting the number of **radiation pulses** (ionizing events) it detects.

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