Physics
Planets are

non-luminous heavenly bodies
luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle

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Physics
Which of the following events occurred first ?

Marconi first tranmitted a wireless signal
Madame Marie Curie became the first woman Nobel Prize winner
Albert Einstein propounded the General Theory of Relativity
Max Planck unveiled the Quantum Theory

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Physics
RADAR is used for:

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

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