Applications of Ultrasounds

Q. Which of the following devices / organisms uses echolocation?

1. Bats

2. Dogs

3. SONAR

4. Telescope

Q. The device which uses ultrasonic sound waves to measure the distance, direction, and speed of underwater objects is:

1. $\text{LASER}$
2. $\text{SONAR}$
3. $\text{RADAR}$
4. $\text{MILER}$