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QusWhat type of sensor is used in a smartwatch to monitor heart rate? Qusहार्ट रेट की मॉनिटरिंग के लिए स्मार्टवॉच में किस प्रकार के सेंसर का यूज़ किया जाता है?

A. Optical sensor
B. Ultrasonic sensor
C. PIR sensor
D. Pressure sensor


Solution
A. Optical sensor



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