Properties and Uses of Magnet

Strength of a magnet is _____ at its _____.

• maximum, centre

• minimum, centre

• maximum, ends

• minimum, ends

An electromagnet can be used in constructing _____.

• 
• 
• 
• 

Pick the correct statement(s) related to “properties of magnets”.

• Like poles attract each other.

• Unlike poles repel each other.

• Attraction is the surest test of magnetism.

• Repulsion is the surest test of magnetism.

An electromagnet built with a core of ______ is a temporary magnet.

• soft iron

• steel

• copper

• glass

Identify the method of magnetisation shown in the picture below.

• Single touch method

• Double touch method

• Electromagnetic induction

• Divided touch method

_____ can demagnetise a magnet.

• Cooling

• Hammering

• Rubbing

• Washing

Riya is building a scrap remover machine that will use a magnet to remove iron parts from the garbage dump and deposit it elsewhere. What kind of magnet will she use in her project?

• Bar magnet

• Dumb bell magnet

• Electromagnet

• Horseshoe magnet

A bar magnet is cut into 4 pieces. Each piece is a _____.

• complete magnet

• north pole of a magnet

• south pole of a magnet

• plain iron bar that has lost its magnetism.

A steel bar can be permanently magnetised by rubbing a bar magnet _____.

• at its ends

• in the centre

• along the length

• in zig-zag fashion along its width.

Match the following .

• {a-I, b-II, c-IV, d-III}

• {a-II, b- III, c-IV, d-I}

• {a-II, b-I, c-III, d-IV}

• {a-IV, b-II, c-I, d-III}