EVS Chapter10

EVS Chapter10

1. Answer the following questions:
(1) During the rainy season, why do crisp biscuits become soft?
(2) Why does water become coloured when crystals of potassium permanganate are added
      to it?
(3) When we add jaggery to water and stir it, why does it taste sweet?
(4) The mountain peaks in the Himalayas are always covered with snow and ice. What could
      be the reason? 

2. Define:
(1) transparent (2) opaque (3) water vapour

3. Give reason:
(1) Water when boils reduces in quantity.
(2) Ice cubes put in a glass make it moist.

4. Diagram:
(1) Show ice cubes turn into water.

5. True or false.
(1) Water is transparent.
(2) Pure water looks bluish in colour.
(3) When water is heated a lot, it turns into ice.
(4) Sugar does not dissolve in water.

6. Fill in the blanks with words from the brackets.
    [ shape, transparent, solid, pure ]
(1) ___________ water has no colour, smell or taste.
(2) Water is ____________.
(3) Water does not have a ____________ of its own.
(4) Ice is the _____________ state of water.