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Properties and Uses of Charcoal

Why is Miner'...

Question

Why is Miner's Safety Lamp a safe lamp?

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Solution

The flame is covered by a gauze, so explosion does not occur on contact with inflammable gas.

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Q. Who invented the safety lamp?

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is less bright than Lamp

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is brighter than Lamp

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is as bright as Lamp

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; then which lamp is the brightest?

Q. A circuit has a fuse of 5A What is the maximum number of 60W (220V) lamps that can be safety used in the circuit?

Q. Why is argon used in lamps?

Q. How many 60 W lamps may be safely run on a 230 V circuit fitted with a 5 A fuse?

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