Question

Richter scale is used in which disaster?

• A. Flood
• B. Cyclone
• C. Earthquake
• D. Drought

Hint:

Richter = Rocks shake (Earthquake) — an easy memory hook.

Answer 1

The Correct Option is C

Step 1: Define the Richter scale.
The Richter scale measures the magnitude of an earthquake based on seismic wave amplitude; it is logarithmic (each whole number $\approx 10\times$ amplitude and about $31.6\times$ energy).
Step 2: Match to disaster type.
Magnitude is a property of earthquakes, not floods, cyclones, or droughts.
Step 3: Conclusion.
Hence, (C) Earthquake is correct.