Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Measuring Instruments
Which of the following devices is used to measure the direction and speed of underwater objects?
1
Silicon Diode
2
Sonar
3
Speedometer
4
More than one of the above
5
None of the above