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UPSC CDS Science & Technology — practice questions — page 8

Explore 248 free Science & Technology questions in UPSC CDS Environment. Open each question or exercise to read its content, reference answers and available explanation.

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Science & Technology questions and exercises with answers

Showing questions 211–240 of 248.

Catch the forest treesRead the answer and worked solution →Pop the forest productsRead the answer and worked solution →Run the forest chainRead the answer and worked solution →Slice the forest wordsRead the answer and worked solution →Plant or animalRead the answer and worked solution →Sort layers, cycles and servicesRead the answer and worked solution →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 →

Worked practice questions

Catch the forest trees

Read exercise and reference answers
Items
  1. Matches the category
    Yes
    Item
    Sal
  2. Matches the category
    Yes
    Item
    Teak
  3. Matches the category
    Yes
    Item
    Semal
  4. Matches the category
    Yes
    Item
    Sheesham
  5. Matches the category
    Yes
    Item
    Neem
  6. Matches the category
    Yes
    Item
    Palash
  7. Matches the category
    No
    Item
    Boar
  8. Matches the category
    No
    Item
    Bison
Category
Forest trees
Instructions
Catch the trees Tibu identified in the forest. Let the animals fall.
_Source: syllabus Science, Chapter 17, Forests: Our Lifeline._

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Pop the forest products

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Other terms
  1. Steel
  2. Plastic
  3. Cement
  4. Glass
Matching terms
  1. Plywood
  2. Paper
  3. Gum
  4. Spices
  5. Fodder
  6. Matchsticks
Instructions
Pop the products we get from forests. Leave the factory materials.
_Source: syllabus Science, Chapter 17, Forests: Our Lifeline._

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Run the forest chain

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Questions
  1. Correct
    Grass
    Choices
    1. Grass
    2. Frog
    3. Eagle
  2. Correct
    Frog
    Choices
    1. Grass
    2. Frog
    3. Eagle
  3. Correct
    Eagle
    Choices
    1. Grass
    2. Frog
    3. Eagle
  4. Correct
    Crown
    Choices
    1. Crown
    2. Canopy
    3. Humus
  5. Correct
    Canopy
    Choices
    1. Crown
    2. Canopy
    3. Humus
  6. Correct
    Humus
    Choices
    1. Crown
    2. Canopy
    3. Humus
Instructions
Chain: producer, insect eater, top eater; then: tree's branchy top, roof of branches, decayed matter.
_Source: syllabus Science, Chapter 17, Forests: Our Lifeline._

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