Physics
Two stones of different masses are dropped simultaneously from the top of a building

Both the stones reach the ground at the same time
Smaller stone reaches the ground earlier
Larger stone reaches the ground earlier
Depends on the composition of the stone

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Metals are good conductors of heat
Plastics have a lower density than metals
Metals have higher thermal capacity than plastics
Plastics have a higher thermal conductivity than metals

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Physics
Which of the following occurred first ?

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

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