The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use?
Correct answer C. Ultrasonic
Tip: press A, B, C or D to answer, and N for the next question.
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See allA six feet tall lady wants to see her full image in a plane mirror . The minimum length of the mirror will be?
Correct answer D. 3 feet
When a ray of sunlight enters a dark room, its straight path become visible because of dust particles hanging in the air. It is because light is?
Correct answer A. Visible
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It is possible to recognize a person in the dark by simply hearing his unique voice . It is because of the?
Correct answer A. pitch
The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least?
Correct answer C. 56 ft
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