Physics
Which statement best describes an igneous intrusion?

Igneous intrusion for when ice crystals splash into lava
Magma explodes to the surface and forms a smooth outer layer of rock
Magma is exported to an open area and forms iron
Magma is injected into surrounding rock forming an igneous intrusive

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

metals have higher thermal capacity than plastics
metals are good conductor of heat
plastics have a higher thermal conductivity than metals
plastics have a lower density than metals

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

The question is incomplete because the masses of the spheres are not given.
A will reach the ground first.
B will reach the ground first.
Both the spheres will reach the ground simultaneously.

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