Physics
Bats can sense obstacles because they produce

Infrasonic sound waves
Micro sound waves
Ultrasonic sound waves
Supersonic sound waves

ANSWER DOWNLOAD EXAMIANS APP

Physics
Negative feedback in amplifiers

Increases bandwidth and increases noise
Increases bandwidth and decreases noise
Decreases bandwidth and decreases noise
Decreases bandwidth and increases noise

ANSWER DOWNLOAD EXAMIANS APP

Physics
RADAR is used for:

receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.
locating geostationary satellites.

ANSWER DOWNLOAD EXAMIANS APP