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QusA proximity sensor in IoT is used to detect: Qus IoT में एक प्रॉक्सिमिटी सेंसर का यूज़ यह पता लगाने के लिए किया जाता है:

A. Motion of objects
B. The presence or absence of nearby objects
C. Magnetic field changes
D. Atmospheric temperature


Solution
B. The presence or absence of nearby objects



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