Available Answers

1. 1.

   Look at the pictures and write the type of weather below each.

   

2. 2.

   Complete the following lines:

   1. Moving air is called _______________.
   2. Gentle and soft blowing wind is called _______________.
   3. Fast and strong blowing wind is called _______________.
3. 3.

   Fill in the blanks with the help of given words:

   (boiling, bacteria, oxygen, gases, three)

   1. Air is a mixture of _______________.
   2. Animals too need _______________ to survive.
   3. Water exists in _______________ forms.
   4. Soluble impurities cannot be seen like _______________ and germs.
   5. The best way of purifying water to remove bacteria and germs is _______________.
4. 4.

   Choose and write the correct option:

   1. Which of the following gas plants need?
      1. Oxygen
      2. Carbon dioxide
      3. Nitrogen
   2. Which of these heats up faster?
      1. Land
      2. Water
      3. Rain
   3. The process in which water changes from liquid form to its vapour from is called _______________.
      1. evaporation
      2. condensation
      3. boiling
   4. Which of the following is the soluble impurity?
      1. stones
      2. mud
      3. germs
   5. We should boil water for about _______________.
      1. minutes
      2. 15 minutes
      3. half an hour
5. 5.

   Write right or wrong for the following statements:

   1. Our Earth is surrounded by a layer of air called atmosphere.
   2. Higher the temperature, lower is the evaporation.
   3. Warm air weighs more than cold air.
   4. During the night, the land cools faster than the sea.
   5. In the process of sedimentation, water is purified using a filter paper.
6. 6.

   Name the gases present in the air.