Available Answers

1. 1.

   Choose the correct answer:

   1. A permanent magnet −
      1. attracts all substances
      2. attracts only magnetic substances
      3. repels all substances
      4. attracts only non-magnetic substances 
   2. Which of the following is a non-magnetic substance?
      1. Cobalt
      2. Iron
      3. Nickel
      4. Wood
   3. Similar poles of two magnets −
      1. attract each other
      2. repel each other
      3. neither attract nor repel 
      4. None of these
   4. A freely suspended bar magnet always aligns itself along the −
      1. north-south direction
      2. east-west direction 
      3. north-east direction 
      4. in any direction 
   5. Temporary magnets are made of −
      1. steel
      2. copper
      3. soft iron 
      4. aluminum 
   6. Permanent magnets are made of −
      1. steel
      2. copper
      3. soft iron
      4. aluminum 
2. 2.

   Fill in the blanks:

   1. The term magnet is derived from the word ___________________.
   2. Artificial magnets are preferred to ________________ magnets because they are more ______________.
   3. A freely suspended bar magnet always points towards ________________ direction.
   4. Similar poles of two magnets ______________ each other.
   5. In a bar magnet, ___________________ have the greatest magnetic force.
   6. Lodestone is a __________________ magnet.
   7. Electromagnet is a _____________________ magnet.
   8. Magnetic induction can only take place in ______________ substances.
3. 3.

   Write True (T) or False (F) against the following statements:

   1. The Earth behaves like a huge magnet.
   2. The north pole of a freely suspended bar magnet will always face towards the geographic south.
   3. Natural magnets are stronger than artificial magnets.
   4. Iron is a non-magnetic substance.
   5. Wood is a non-magnetic substance.
   6. Similar poles attract each other.
   7. Magnetic poles always appear in pairs.
   8. An electromagnetic is a permanent magnet.
   9. Magnetic keepers are used to protect bar magnets.
4. 4.

   Match the following:

   Column  A	Column  B
   1. Iron, cobalt , nickel	a. Natural magnetic
   2. Wood, air, water	b. Electromagnet
   3. Used in large computers	c. Non-magnetic substances
   4. Used in electric bells	d. Magnetic substances
   5. Lodestone	e. Ceramic magnet

    

5. 5.

   With proper reasoning, choose the odd one out :

   1. iron, copper, cobalt, nickel
   2. steel, copper, aluminum, brass 
   3. single-touch method, double-touch method, magnetic induction, magnetic separation 
   4. bar magnet, horseshoe magnet, cylindrical magnet, lodestone 
6. 6.

   Classify the following into magnetic and non-magnetic substances:

   Wood, iron, copper, air, brass spoon, plastic ruler, soap cake, water, paper, clothes, steel, plastic button, cobalt, nickel, aluminum.