railway RRB Technician Grade 1 Mock Test 2024 Communication Systems Optical Sources and Detector LED

ઘરેલું ઉપયોગ માટે સામાન્ય રીતે કયા રંગનો LED લેમ્પ વપરાય છે?

1
સફેદ 
2
કાળો 
3
લાલ 
4
લીલો 
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