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locating submerged submarines
receiving a signals in a radio receiver
locating geostationary satellites
detecting and locating the position of objects such as aeroplanes
Sound of frequency below 20 Hz is called
On a clean glass plate a drop of water spread to form a thin layer whereas a drop of mercury remains almost spherical because
Brass gets discoloured in air because of the presence of which of the following gases in air ?
Which is a non metal that remains liquid at room temperature ?
Chlorophyll is a naturally occurring chelate compound in which central metal is
Which of the following is used in pencils ?
Which of the following metals forms an amalgam with other metals ?
Chemical formula for water is
The gas usually filled in the electric bulb is
Washing soda is the common name for