Q8 of 46 Page 269

Fuse wire is made up of an alloy of ___________ which has high resistance and_______.

Accordingly Low melting point.

Nickel, Chromium, Manganese, Iron, Zinc, Tin type of metals and the most common Domestically used fuse wire is of an alloy Nichrome .


The alloy of fuse wire is made and tested that it should have low melting point accordingly, so that it is able to break the circuit by melting when high ampere of current passes through it which can destroy our electrical appliances.


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6

We know that γ – rays are harmful radiations emitted by natural radioactive substances.

i) Which are other radiations from such substances?


ii) Tabulate the following statements as applicable to each of the above radiations


(They are electromagnetic radiation. They have high penetrating power. They are electrons. They contain neutrons)

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Draw the schematic diagram of an electric circuit consisting of a battery of two cells of 1.5V each, three resistances of 5-ohm, 10 ohm and 15 ohms respectively and a plug key all connected in series.

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Observe the circuit given and find the resistance across AB.

 10

Complete the table choosing the right terms within the brackets.

(zinc, copper, carbon, lead, lead dioxide, aluminum.)