Physics
Lightning conductor is made up of:
- copper
- glass
- ebonite
- wood
Static Electricity
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Answer
copper
Reason — A lightning conductor is a long copper rod whose lower end is connected to a copper plate buried deep into the ground and its upper end has sharp spikes projecting above the top of the building.
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Related Questions
A glass rod rubbed with silk is touched with the disc of a negatively charged gold leaf electroscope. The divergence of leaves will:
- decrease
- increase
- remain unchanged
- first decreases and then increases
The rod in a gold leaf electroscope is made up of:
- wood
- brass
- glass
- ebonite
Assertion (A) : A fuse is used in an electrical appliance to safeguard from electric shocks.
Reason (R) : A fuse melts and breaks the circuit when excessive current flows through it.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Assertion (A) : MCB is more effective than a fuse in household wiring.
Reason (R) : MCB can be reset (raised up) after tripping whereas fuse must be neglected once blown.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true