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प्रश्न
Write a short note on lighting conductors.
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उत्तर
Lightening conductor is a device used to safeguard the large buildings against the lightening of the thunderstorm. Normally, they are fitted on the top of tall buildings as a safety device. It consists of few metal spikes fitted to the highest part of the building and connected to thick copper strip which is buried inside the earth.
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संबंधित प्रश्न
Fill in the blank
Like poles ______ each other and unlike poles _____
Match the following
| Column A | Column B |
| (a). Human body | (1). electric bell |
| (b). Silk thread | (2). current |
| (c). Charge in motion | (3). conductor |
| (d). soft iron | (4). electromagnet |
| (e) . Electromagnet | (5). insulator |
State if the following statement is true or false. Correct the statement if it is false.
Whenever a magnet is not in use, it should be stored along with other magnets.
The alloys called ______ and ______ are used for making industrial magnets.
There are two knitting needles. One of them is magnetized. How will you find out which one is magnetized, if no other magnet is available?
Define the term Poles of a magnet
Give scientific reason:
Two steel needles hanging from the lower end of a vertical bar magnet do not hang vertically.
Give scientific reason:
Not attraction but repulsion is a sure test of magnetism.
Differentiate between:
Primary and secondary cell.
Magnets are used in _______ for generating electricity.
