Physics
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

Remain unaffected
Decrease
Have its shape changed
Increase

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Physics
Which of the following occurred first ?

Max Planck unveiled the Quantum Theory
Guglielmo Marconi sent out the first wireless signals
Albert Einstein propounded the General Theory of Relativity
Wright Brothers successfully flew an aircraft

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