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Answer 1

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✒Properties of magnetic field lines :

1. Magnetic field lines never intersect each other .

2. They travel from the north to the South Pole of a magnet outside the magnet and from South to North Pole inside the magnet.

3. they are continuous close curves.

4. the emerge out normally from the magnetic surface.

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✒frequency = 1/ 0.01

= 100 hz

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✒Rancidity :

⚫The condition produced by aerial oxidation of fats and oils in foods Marked by unpleasant smell and taste is called rancidity.


⚫Prevention methods :

1. Rancidity can be prevented by adding anti- oxidants to food containing fats and oils.

2. Rancidity can be prevented by packaging fat and oil containing food in Nitrogen gas.

3. Rancidity can be retarded by keeping food in refrigerator.

4. Rancidity can be retarded by storing food in airtight container or by storing food away from light.

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✒Corrosion :

⚫ The eating up of metals by the action of air, moisture and Chemicals (such as acid) on their surface is called corrosion.

⚫ But the corrosion of Iron is called rusting.

⚫ Rusting : When an iron object is left in damp air (or water) for a considerable time, it gets covered with the Red Brown flaky substance called rust. This is called rusting of Iron.

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