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Subject:

science-chemistry

Class:

class VI

Key Concepts

clouds, condensation, drought, evaporation, flood, ground water, hail, ocean, rainwater harvesting, snow, water vapour, water cycle

essential questions

1. What would happen if water cycle did not exist?
2. Quantity of water in the earth does not reduce because of water cycle, but there is scarcity of potable water, can you think why is it so?

Remembering:

  1. Tanks that supply water to towns are built at: a) roofs of buildings   b) tall water towers  c) town level  d) high lands
  2. Fluoride is added to water, which helps to prevent  a) tooth decay   b) infections   c) fever    d) sickness
  3. The smell of water is:  a) sweet  b) bad  c)  odorless   d) irritating
  4. Taste of water is:  a) sour   b) bitter    c) sweet  d) tasteless
  5. Color of water is: a) white  b) grey  c) dark  d) colorless
  6. If we don’t drink water we will eventually:  a) get dry   b) be very thirsty   c) die   d) get hydrated
  7. Most of the rain water goes into: a) Lakes and ponds b) Transpiration and evaporation  c) the ground water  d) rivers and sea
  8. The circulation of water between ocean and land is a continuous process known as ______  a) Transpiration b) evaporation  c) raining  d) water cycle
  9. Rise in water level of rivers leads into:  a) flood   b) drought   c) water scarcity  d) dry lands
  10. In early winter mornings, we can see drops of water on the grass. This is because: a) transpiration  b) photosynthesis  c) condensation  d) water cycle
  11. Fog appearing on a cold winter morning and blackboard drying up after wiping is due to:  a) Evaporation and condensation respectively  b) condensation and evaporation respectively   c) Neither of the two
  12. Which of the following is not a source by which water in rivers, lakes, ponds, wells and soil is replenished:  a) rain  b) hail  c) snow  d) evaporation
  13. Which of the following is not a source of potable water:  a) well   b) river  c) lake  d) sea
  14. Permanent hardness is caused due to: a) magnesium carbonate  b) magnesium bicarbonate  c) magnesium sulphate  d) all of the above
  15. Ground water gets recharged by the process of : a) aquification  b) transpiration  c) infiltration  d) transportation
  16. Water becomes germ free when we boil it for : a) 5 mins b) 10-15 mins  c) add chlorine to water d) Both b & c
  17. What is water hardiness?  a) refers to the level of minerals in the water  b) refers to how frozen water is  c) refers to how deep in the ground the water source is   d) refers to how healthy water is
  18. Define rainwater harvesting.
  19. What is ground water?
  20. Fill in the blanks:
  1. One way of increasing the availability of water is to collect rainwater and store it for later use. This is called ________
  2. Nearly ______ of water is fit to drink and _____ is locked up as frozen ice.
  3. According to research done in Delhi, nearly ______ of water supplied by Delhi Municipal corporation is lost due to leakages of pipe.
  4. Water is called as the ________ solvent.
  5. Chemicals used fro softening of hard water are known as_________
  6. Hard water can be made soft by reducing the concentration of __________ and _______ minerals from water.
  7. Temporary hardness of water is due to ______________ and _________
  8. Temporary hardness can be removed by _______ & filtering water.
  9. Permanent can be removed by adding _________ also know as washing soda to water and filtering it.

 

understanding:

  1. Highlight some of the ways in which we can conserve water.
  2. What are droughts? What happens when there is a drought?
  3. What is water cycle. Explain with a diagram
  4. Water vapor condenses to form tiny droplets of water in the upper layers of air where it is cooler. These droplets fall down as:  a) rain  b) storm  c) cyclone  d) drought
  5. Which of the following is potable water: a) a glass of water fit for drinking   b) water in a pot   c) sea water   d) water with bacteria and chemicals
  6. Water from the wet clothes disappears due to ______:  a) condensation  b) evaporation   c) moisture  d) Sun
  7. Where does the energy for the water cycle come from:  a) the spin of the earth  b) the moon  c) fossil fuels   d) the sun  e) Electricity
  8. Why is water  scarcity increasing  day by day: a) water cycle has stopped functioning  b) total amount of water on earth has decreased   c) consumption of water has increased   d) there is an increase in floods
  9. X is the process by which plants lose water. What is X: a) evaporation  b) transpiration  c)  condensation  d) translocation
  10. Which of these occurs due to condensation: a) drying of wet clothes   b)  water drops appearing on the outer side of a cool water bottle  c)steam rising from wet clothes when they are ironed  d) black board gets dired after it is wiped with wet cloth
  11. Which of the following causes water to change from one state to another: a) pressure  b) concentration  c) temperature  d) volume
  12. Which of the following is not a way that water moves from the land to the atmosphere? a) evaporation    b) precipitation   c) sublimation    d) transpiration
  13. What is the main process by which water moves from land to the atmosphere? A) evaporation b) precipitation c) sublimation d) transpiration e)condensation
  14. What is it called when plants release water that turns into vapor? A) evaporation b) precipitation c) sublimation d) transpiration  e)condensation
  15. What is the process called when water from ice or snow turns directly into vapor without melting?        a) evaporation  b) precipitation   c) sublimation   d) transpiration   e)condensation
  16. In what form can we see water in the atmosphere?  a) lakes  b) rivers  c) oceans  d) winds  e) clouds
  17. What is the process called when water vapor becomes liquid water?  a) evaporation   b) precipitation   c) sublimation  d) transpiration   e) condensation
  18. What is it called when water falls from the atmosphere to the Earth?  a) evaporation  b) precipitation  c) sublimation   d) transpiration   e)condensation

Application:

  1. How are clouds formed?
  2. How do droughts occur? How can we control the occurrence of droughts?
  3. Why is important to maintain the ground water levels in the areas we live?
  4. Can you give reason why there are white deposits formed on taps in some places. What does it tell us about the water of that place.
  5. Why does food gets cooked at a faster pace in a pressure cooker? Usha puts a wet towel to dry out under the sun. Which part will dry out fast : a) X    b) Y   c) Both X and Y together   d) None of these
  6. In a small town, the number of water pumps, concrete houses and roads increased. What happens to the water table of that place:  a) becomes lower   b) becomes higher  c) remains unaffected  d) first becomes lower and then higher
  7. Cloud seeding is a technique that induces rain. What does the process involve:  a) adopting an agricultural practice that depends on clouds   b) Introducing particles in clouds to facilitate condensation  c)  making clouds and placing them in the sky  d) scattering clouds to form seed like structures

Analysis:

  1. A glass containing ice has water droplets around it. What conclusion can be drawn from this :  a) the water from the ice has settled outside the glass   b) there is water in the air which has got condensed around the glass c) the glass is sweating   d) the glass of ice is not so storm hence water goes through the glass and settles outside
  2. In the given figure are four containers that contain the same amount of water. In which of the following containers will water evaporate the slowest? a) S    b) T    c) U   d) V
  3. Why do you think there is so much campaigning around rainwater harvesting? How will it help us?
  4. Why do we see dew drops formation happening in winters only?
  5. Why do clothes dry out faster on a sunny day than on a cloudy day?

Evaluation:

  1. Water is available in the form of water cycle, still it is said we need to conserve water. Why do you think it is important to conserve water.

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