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

Increase
Remain unaffected
Decrease
Have its shape changed

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Physics
Lightning is produced when

Strong opposite charges in different clouds break down the resistance offered by the intervening air
Clouds strike against impurities in air and the friction burns up these impurities
Similar charges of electricity rush towards each other and then get repelled
Water vapour produces electricity in the clouds

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Physics
An integrated circuit is more advantages than a coventional circuit because

A faulty part of a conventional circuit may be difficult to locate and repair
All listed here
If a part of the integrated circuit fails the entire circuit is simply replaced
They make the electric equipments more reliable and easier for servicing

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