Please select a subject first
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Which of the following is/are products of wastewater treatment?
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The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
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Which of the following is not a source of waste water?
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State whether the following statement is True or False. In case a statement is false, write the correct statement.
Sewage is a solid waste which causes water pollution and soil pollution
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State whether the following statement is True or False. In case a statement is false, write the correct statement.
Used water is wastewater
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State whether the following statement is True or False. In case a statement is false, write the correct statement.
Wastewater could be reused
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State whether the following statement is True or False. In case a statement is false, write the correct statement.
Where underground sewerage systems and refuse disposal systems are not available, the high cost on-site sanitation system can be adopted
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Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
- Sludge is scraped out and skimmer removes the floating grease.
- Water is made to settle in a large tank with a slope in the middle.
- Large objects like plastic bags are removed by passing wastewater through bar screens.
- Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.
- Wastewater enters a grit and sand removal tank.
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Three statements are provided here which define the terms –
- sludge
- sewage and
- wastewater.
Pick out the correct definition for each of these terms.
- The settled solids are removed in wastewater treatment with a scraper.
- Water from the kitchen is used for washing dishes.
- Wastewater is released from homes, industries, hospitals and other public buildings.
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Describe various steps of cleaning wastewater in a wastewater treatment plant.
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Collect data from your friends, neighbours and classmates to know more about “milk teeth".
Tabulate your data. One way of doing it is given below:
| S.No. | Age at which first tooth fell | Age at which last tooth fel | No. of teeth lost | No. of teeth replaced |
| 1. | ||||
| 2. | ||||
| 3. | ||||
| 4. | ||||
| 5. |
Find out from at least twenty children and find the average age at which children lose the milk teeth. You may take help of your friends.
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Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
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Visit a laughing gallery in some science centre, or a science park or a village mela. You will find some large mirrors there. You can see your distorted and funny images in these mirrors. Try to find out the kind of mirrors used there.
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How would you test the presence of starch in leaves?
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Give a brief description of the process of synthesis of food in green plants.
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Show with the help of a sketch that the plants are the ultimate source of food.
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In photosynthesis, solar energy is absorbed by the pigment called ______.
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During photosynthesis plants take in ______ and release ______ gas.
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Name the following:
A plant that has both autotrophic and heterotrophic mode of nutrition.
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