question_answer10) Insert a magnetised needle through a paper cork. Let the cork float in the water placed in a tub in such a way that the cork does not touch the water. Does the needle always point in the same direction when the cork stops rotating?View Answer play_arrow
question_answer14) Fill in the blanks in the following: (i) Artificial magnets are made in different shapes such as ....... and .... (ii) The materials which are attracted towards a magnet are called .... (iii) Paper is not a ... material. (iv) In older days, sailors used to find direction by suspending a piece of.... (v) A magnet always has ... poles.View Answer play_arrow
question_answer15) State whether the following statements are true or false: (i) A cylindrical magnet has only one pole. (ii) Artificial magnets were discovered in Greece. (iii) Similar poles of a magnet repel each other. (iv) Maximum iron filings stick in the middle of a bar magnet, when it is brought near them. (v) Bar magnets always point towards North-South direction. (vi) A compass can be used to find East-West direction at any place. (vii) Rubber is a magnetic material.View Answer play_arrow
question_answer16) It was observed that a pencil sharpener gets attracted by both the poles of a magnet although, its body is made up of plastic. Name a material that might have been used to make some part of it.View Answer play_arrow
question_answer17) Column I shows different position in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
|Column I||Column II|
question_answer23) A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case is stated in Column I. Possible reasons for the observed affects are mentioned in Column II. Match the statements given in Column I with those in Column II.
|Column I||Column II|
|(i)||Boat gets attracted towards the magnet||(a)||Boat is fitted with a magnet with North pole towards its head|
|(ii)||Boat is not affected by the magnet||(b)||Boat is fitted with a magnet with South pole towards its head|
|(iii)||Boat moves towards the magnet, if North pole of the magnet is brought near its head||(c)||Boat has a small magnet fixed along its length|
|(iv)||Boat moves away from the magnet when North pole is brought near its head||(d)||Boat is made of magnetic material|
|(V)||Boat floats without changing its direction||(e)||Boat is made up of a non-magnetic material|
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