Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Surveying Remote Sensing

A passive sensor uses:

1

Signals emitted from transmission towers

2

Its own source of energy

3

Sun as the source of energy

4

More than one of the above

5

None of the above

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