Available Answers

1. 1.

   Tick the correct option.

   1. The colour of methyl orange in acids is
      1. yellow.
      2. pink.
      3. red.
      4. orange.
   2. Rusting of iron can be prevented by
      1. galvanising.
      2. electroplating.
      3. alloying.
      4. galvanising, electroplating and alloying.
   3. Humus and the smallest particles of rock form the
      1. A-Horizon.
      2. B-Horizon.
      3. C-Horizon.
      4. bedrock.
   4. The scientists who study and forecast weather are called ______________.
      1. meteorologists
      2. biologists
      3. psychologists
      4. geologists
   5. Exhaled air contains more of ______________ gas than inhaled air.
      1. nitrogen
      2. oxygen
      3. carbon dioxide
      4. argon
2. 2.

   What makes the soil acidic? How it can be treated?

3. 3.

   How can you say whether distilled water is acidic/basic/neutral?

4. 4.

   What will happen if a copper wire is dipped in a solution of ferrous sulphate?

5. 5.

   The air above a farmland is shimmering during a hot summer day. Give reason.

6. 6.

   How do elephants living in tropical rainforests adapt themselves?