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State PSC Environment & Ecology — practice questions — page 11

Explore 332 free Environment & Ecology questions in State PSC Environment. Open each question or exercise to read its content, reference answers and available explanation.

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Environment & Ecology questions and exercises with answers

Showing questions 301–330 of 332.

Type the numberRead the answer and worked solution →Forests bingoRead the answer and worked solution →Used water rich in lather, oil and dirt going down drains from sinks and toilets is called:Read the answer and worked solution →More than how many people worldwide have no access to safe drinking water?Read the answer and worked solution →The UN proclaimed 2005-2015 as the International Decade for action on:Read the answer and worked solution →Wastewater released by homes, industries, hospitals and offices, including storm runoff, is:Read the answer and worked solution →Vibrio cholerae and Salmonella paratyphi in sewage cause cholera and:Read the answer and worked solution →The network of big and small pipes carrying sewage to a treatment plant is the:Read the answer and worked solution →Manholes in a sewerage system are located every:Read the answer and worked solution →The first step at a wastewater treatment plant removes rags, sticks and cans using:Read the answer and worked solution →In the grit and sand removal tank, the speed of incoming wastewater is decreased so that:Read the answer and worked solution →Solids like faeces that settle at the bottom of the clarifier tank are called:Read the answer and worked solution →The device that removes floatable solids like oil and grease from wastewater is a:Read the answer and worked solution →Sludge in a separate tank is decomposed by anaerobic bacteria, producing:Read the answer and worked solution →Air is pumped into clarified water to help which bacteria grow and eat remaining waste?Read the answer and worked solution →Activated sludge is about what share water?Read the answer and worked solution →Dried sludge from a treatment plant is used as:Read the answer and worked solution →Treated water may be disinfected before release with chlorine and:Read the answer and worked solution →Which trees planted along sewage ponds absorb surplus wastewater and release pure vapour?Read the answer and worked solution →Cooking oil and fats should not go down the drain because they:Read the answer and worked solution →Swachh Bharat, the mission for sewage disposal and toilets for all, began in:Read the answer and worked solution →A vermi-processing toilet treats human excreta using:Read the answer and worked solution →Groundwater polluted by open defecation becomes the most common route for:Read the answer and worked solution →Septic tanks are suitable for hospitals, isolated buildings or a cluster of how many houses?Read the answer and worked solution →Catch the treatment stepsRead the answer and worked solution →Pop the water borne diseasesRead the answer and worked solution →Run the treatment plantRead the answer and worked solution →Slice the sewage wordsRead the answer and worked solution →Organic or inorganic impurityRead the answer and worked solution →Sort the treatment processesRead the answer and worked solution →

Worked practice questions

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Questions
  1. Answer
    60
    Question
    Years ago Tibu's village was carved from the forest, about
  2. Answer
    5
    Question
    Organisms in the chain grass, insects, frog, snake, eagle
  3. Answer
    3
    Question
    Forest layers: tall trees, shrubs and grasses, herbs
  4. Answer
    30
    Question
    Minutes the rain lasted before it stopped, about
  5. Answer
    1
    Question
    Hours the children spent at Tibu's village
  6. Answer
    3
    Question
    Days to wait before checking the warm compost pit
Instructions
Type the number only.
_Source: syllabus Science, Chapter 17, Forests: Our Lifeline._

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Forests bingo

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Clues and terms
  1. Clue
    Forests giving oxygen.
    Item
    Green lungs
  2. Clue
    Branchy top of a tree.
    Item
    Crown
  3. Clue
    Roof of tall tree branches.
    Item
    Canopy
  4. Clue
    Horizontal forest layer.
    Item
    Understorey
  5. Clue
    Grass to insects to frog to snake.
    Item
    Food chain
  6. Clue
    Turns dead matter into humus.
    Item
    Decomposer
  7. Clue
    Dark decayed matter.
    Item
    Humus
  8. Clue
    Kept up by seeping rain.
    Item
    Water table
  9. Clue
    Stops forest regeneration.
    Item
    Overgrazing
Instructions
Read each clue and tap the term it describes.
_Source: syllabus Science, Chapter 17, Forests: Our Lifeline._

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Used water rich in lather, oil and dirt going down drains from sinks and toilets is called:

  1. Wastewater
  2. Rainwater
  3. Groundwater
  4. Fresh water
Show answer and solution

Correct answer: A. Wastewater

1. It should not be wasted. 2. This used water is wastewater. 3. Pollutants are removed by treatment. _Source: syllabus Science, Chapter 18, Wastewater Story._

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