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Which lens is used in sodium reflector lamp ?
Which physical property is considered dimensionless?
Temperature of the Sun is measured by?
Iron, Nickel and Cobalt are the examples of
Which of the following instruments is used to measure humidity?
Where is the gravitational acceleration zero?
Which pioneer of the late 19th century is credited with using radio waves for signal transmission over several kilometers?
The waves which are less than 20Hz are known as
Which of the following layers of the atmosphere makes Radio Communication possible?
Which of the following statements is true when we see 'rainbow'?
