Physics
Which of the following occurred first ?

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

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
It will fall down at the same place where the string breaks
The ball will travel towards the center of the circle and fall down
None of these

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
Both silver and gold pieces weigh equal
The silver piece will weigh more
The gold piece will weigh more

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