मृदु व कठोर X-किरणों में अन्तर होता है?

✅ Correct Answer: C

आवृति का

📚 Learning Context: Current Affairs

General competitive examinations frequently test candidates on Current Affairs topics. Questions like "मृदु व कठोर X-किरणों में अन्तर होता है?..." are designed to verify factual recall and general awareness. Regular practice on similar MCQs ensures a higher accuracy rate. The correct option here is आवृति का.