7th Cbse Ncert Sample Questions | Wastewater Story, Ncert Science

 


WASTEWATER STORY
CBSE Class VII, Science (NCERT)
Sample questions with their Solutions (as per latest CCE scheme of examinations of CBSE)
Important Short Type Questions with Solutions

Q.1: Which decade has been decided for action on “Water for Life”?

Solution: It is 2005 - 2015.

Q.2: By which name the toilets in which human excreta are treated by earthworms is called?

Solution: Vermi-processing toilet.

Q.3: Fill in the blanks:
  1. _______ is generated in homes, industries, agricultural fields and in other human activities. This is called _______.
  2. Sewage is a liquid waste which causes ______ and ____ pollution.
  3. Wastewater is treated in _______ treatment plant.
  4. By-products of wastewater treatment are ______ and _______.
  5. ________ of water can be removed by boiling it or treating it with washing soda.
  6. Cleaning of waste water is commonly known as ________.

Solution: a. wastewater, sewage. b. water, soil. c. sewage. d. sludge, biogas. e. hardness. f. sewage treatment. 

Q.4: What is ‘Sanitation’?

Solution: The proper disposal of sewage and garbage from the houses and other sources like industries etc. is called ‘Sanitation’.

Q.5: What is ‘Chlorination’?

Solution: It is the process of adding bleaching powder to water. Water can be made suitable for drinking purpose by chlorination.

Important Long Type Questions with Solutions

Q.1: What are different methods to make water potable (fit for drinking)?

Solution: We use different methods in our homes to make water potable. Water obtained from the source is filtered before use. Those who depend on wells for the supply of water pot a few crystals of potassium permanganate into the well. Bleaching powder chlorine tablets are also used to make water fit for drinking. Now-a-days machines are available for water purification in which water is passed through carbon filter, ultra-violet ray or through Reverse Osmosis process.

View Wastewater Story, Class 7 Solutions of NCERT (CBSE) Science Chapter Exercise Questions

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  1. Q.1: Which decade has been decided for action on “Water for Life”?

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