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Weekly Quiz Competition
  • Question 1
    1 / -0

    Addition of harmful substance in water to make it unfit for human consumption is called?

    Solution

    Explanation:

    Whenever harmful substances such as sewage, toxic chemicals, silt, etc., get mixed with water, the water becomes polluted and unfit for human consumption. This is known as water pollution.

     

  • Question 2
    1 / -0

    The substance that pollute the natural substance is called

    Solution

    Explanation:

    The substances that pollute the natural substances like air, water and soil are called pollutants. Exhaust and sewage from industries,vehicular emission, non-biodegradable materials,silt etc. are some common pollutants.

     

  • Question 3
    1 / -0

    Conversion of dead trees and other plants into coal is called :

    Solution

    Explanation:

    Conversion of dead trees and other plants into coal inside the earth crust due to high temperature and pressure is called carbonisation.

     

  • Question 4
    1 / -0

    Coal type that contains lowest amount of carbon is :

    Solution

    Explanation:

    Carbon content in lignite coal is less than 50%, so, lignite coal is the inferior quality of coal. Bituminous coal is best quality of coal.

     

  • Question 5
    1 / -0

    Rust formation is called :

    Solution

    Explanation:

    Formation of rust on metal surface like iron is also called as corrosion. Corrosion occurs in presence of water and oxygen.

     

  • Question 6
    1 / -0

    Non metals occur as:

    Solution

    Explanation:

    Non-metals are found in nature in solid, liquid and gaseous state. On the other hand metals are found in solid state except mercury that is liquid at room temperature.

     

  • Question 7
    1 / -0

    Any plant cultivated on large scale at a large stretch of land is called :

    Solution

    Explanation:

    When plants of same kind are grown and cultivated at one place on large scale, it is called a crop. For example crop of wheat, crop of rice etc.

     

  • Question 8
    1 / -0

    Process of loosening and turning the soil is called :

    Solution

    Explanation:

    The process of loosing and turning of the soil is called tilling or ploughing. This is done by using a plough, made up of wood or iron.

     

  • Question 9
    1 / -0

    Robert Hooke observed under microscope :

    Solution

    Explanation:

    Robert Hooke observed dead cells of thin slice of cork. He observed small compartments and called it cell.

     

  • Question 10
    1 / -0

    Hen's  egg is a :

    Solution

    Explanation:

    Hen’s egg is a single cell. Most of the cells are not visible with naked eyes. Microscope is needed to observe cells but Ostrich eggs and Hen’s eggs are also single cell.

     

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