Physics
The scientist who first sent electromagnetic waves to distant places is

John Logie Baird
Thomas Alva Edison
Heinrich Hertz
James Clerk Maxwell

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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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Physics
The wall of a dam is broader at the base

Because streamlining is required
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth
To withstand pressure that increases in a horizontal plane

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