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metal and is used in making of jewellery., , 14. Magnetism, , Multiple Choice Questions (MCQs). Tick () the correct options. Page No. 169, 1. (d) 2. (d) 3. (b) 4. (b) 5. (d), , Multiple Choice Questions (MCQs). Tick (/) the correct options. Page No. 173, 1. (c) 2. (a) 3. (c), , SECTIONA, , CLASS RESPONSE, , A. Oral questions., 1. The substances having the property of attracting iron objects are known, , as magnets. Magnetite is a natural magnet., , A freely suspended magnet align itself in north-south direction., Travellers and navigators use the magnetic compass to know the, directions while travelling., , 4. The quickest way of picking the iron pins that have been spilled on the, floor is by using magnets., B. Science quiz., 1. The maximum iron filings get attracted to the poles of a magnet., 2. Magnetic keepers, , WORKSHEET, A. Tick (V) the correct options., 1. (c) 2 () 3. (a) 4. (b) 5. (c), , B. Circle the odd ones. Give reasons for your choice., 1. Plastic — It is a non-magnetic material, whereas others are, magnetic materials., 2. Iron — It is a magnetic material, whereas others are nonmagnetic materials., 3. Rubbing — Itis a method to induce magnetism, whereas others, are methods of demagnetisation., , 4. Television — It’s surface is not coated with magnetic material to, store data, whereas others have magnetic surface for, storage of data., , C. Fillin the blanks., , 1. magnetic 2. magnetic, 3. two 4. repel, attract, 5. centre, , D. Match the following., 1. (d) 2. (a) 3. (b) 4. (c), , SECTION B, A. Multiple Choice Questions (MCQs) Scientific/Practical skills., 1. (c) 2. (a) 3. (b), B. Very Short Answer Questions., 1. (i) Magnets are used to separate iron and steel from junk materials., (ii) Information is stored in magnetic strips of credit cards and ATM, cards., (iii) Data, sound and images are stored on special surface coated with, magnetic material in CDs and floppies., (iv) In scrapyards, magnets are used to separate iron and steel from, junk materials., , ae, , 2. Iron and steel/nickel/cobalt, , 3. Magnetite, , 4. On heating, the magnets lose their property of magnetism., , C. Short Answer Questions., , 1. The substances that are attracted by the magnets are called magnetic, substances. Eg. — Iron, steel, nickel and cobalt are magnetic substances., , 2. The substances that are not attracted by the magnets are called nonmagnetic substances. Wood, stone, leather, plastic, aluminium and, copper are non-magnetic substances., , 3. | S.No. Natural magnets Artificial magnets, (i) | These are formed in nature. These are prepared by, humans., (ii) | They generally have low They generally have more, magnetic power. magnetic power than natural, , magnets.