Available Answers

1. 1.

   Arrange the substances shown below in order of their increasing hardness.

   

2. 2.

   Choose the correct option. (MCQs)

   1. Which among the following is the building block of matter?
      1. Molecule
      2. Material
      3. Substance
      4. Atom
   2. Which is the strongest solid?
      1. Leather
      2. Glass
      3. Steel
      4. Cotton
   3. Tick the hardest solid among the following.
      1. Talc
      2. Concrete
      3. Diamond
      4. Glass
   4. Two objects, A and B, are of the same shape and size. If B feels heavier than A then tick the correct statement.
      1. B is a metal and A is not.
      2. Density of B is more than A.
      3. Density of A is more than B.
      4. B is made up of cotton and A of metal.
3. 3.

   Which of the following show elasticity and which show plasticity? Write P for plasticity and E for elasticity.

   clay, plasticine, metal spring, band aid, lycra hair band, foam, rubber band, rubber ball

4. 4.

   State True or False.

   1. Atoms combine to form molecules.
   2. Iron is stronger than wood.
   3. A large number of molecules together make a substance.
   4. Metals expand on cooling.
5. 5.

   Oil floats on top of water even though both are liquids. Give reasons.
6. 6.

   Substances like metals expand on heating and contract on cooling? Give reasons.