Changes around us Worksheet-2

Changes around us Worksheet-2

 

Fill in the blanks:

  1. Mercury is used in _________ for checking temperature.
  2. Cooling causes a material to ________.(contract/expand)
  3. The balloon _________, as the air inside the balloon contracts on cooling.
  4. Water contracts on cooling until it reaches the temperature of _____°C.
  5. The tyres are _________ to expand them.
  6. Digestion of food is a ________ change.
  7. Chopping of potatoes is a _________ change.
  8. A change that can be reversed is called a _________ change.
  9. A change where no new substances are formed is called a ___________ change.
  10. A change that cannot be reversed is called an __________ change.
  11. A change where new substances with different properties are formed is called a __________ change.
  12. The unit of work is ________.
  13. Mercury __________ when the bulb of the thermometer comes in contact with a hot object. (expands/contracts)
  14. When water is cooled from 4°C to 0°C, it__________. (expands/contracts)
  15. _________ expand the least while gases expand the most.

 

Answer Key:

  1. thermometer
  2. contract
  3. shrinks
  4. 4/ four
  5. Heated
  6. chemical/ irreversible
  7. physical/ irreversible
  8. reversible
  9. physical
  10. irreversible
  11. chemical
  12. joule
  13. expands
  14. expands
  15. Solids