Q8 of 20 Page 81

How will you test that ‘tea dust’ is not adulterated with iron powder?

It can be tested whether tea dust is adulterated with iron powder or not if we use a magnet. We move the magnet over the tea dust then if it’s adulterated, iron powder will be attracted to the magnet and if it’s not then magnet will come out clean.


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6

Fill in the blanks

(i) When a bar magnet is broken; each of the broken part will have ................ pole/poles.


(ii) In a bar magnet, magnetic attraction is ............... near its ends.

 7

Paheli and her friends were decorating the class bulletin board. She dropped the box of stainless steel pins by mistake. She tried to collect the pins using a magnet. She could not succeed. What could be the reason for this?

 9

Boojho dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filings got stuck to the magnet as shown in Fig. 13.4.


(i) Which regions of the magnet have more iron filings sticking to it?


(ii) What are these regions called?

 10

Four identical iron bars were dipped in a heap of iron filings one by one. Fig. 13.5 shows the amount of iron filings sticking to each of them.


(a) Which of the iron bar is likely to be the strongest magnet?


(b) Which of the iron bars is not a magnet? Justify your answer.