RADAR is used for:

Question

The percentage of the total power carried by the sidebands of the AM wave for tone modulation when the modulation index is 0.3 is:

Answer 1

Go through each option and match it against the correct underlying technology.

Locating submerged submarines is the job of sonar, which relies on sound waves travelling through water, since radio waves do not travel well underwater. This rules out option A for radar.
Receiving a signal in a radio receiver is the normal function of a plain radio set, a completely different device from radar, ruling out option B.
Locating geostationary satellites is done using known orbital data and tracking antennas, not the echo principle that defines radar, ruling out option C.
Detecting and locating objects such as aeroplanes fits exactly how radar works, sending out radio waves and analysing the reflected echo to find distance, speed and direction.

By elimination and by direct match, the correct answer is option D.

Answer 2

Go through each option and match it against the correct underlying technology.

Locating submerged submarines is the job of sonar, which relies on sound waves travelling through water, since radio waves do not travel well underwater. This rules out option A for radar.
Receiving a signal in a radio receiver is the normal function of a plain radio set, a completely different device from radar, ruling out option B.
Locating geostationary satellites is done using known orbital data and tracking antennas, not the echo principle that defines radar, ruling out option C.
Detecting and locating objects such as aeroplanes fits exactly how radar works, sending out radio waves and analysing the reflected echo to find distance, speed and direction.

By elimination and by direct match, the correct answer is option D.

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