STD-6th Chapter Test Sub-science Mark-20

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STD-6th  Chapter Test   Sub-science  Mark-20 - Quiz

Natural resources-Air,water&land
Q. 1 a) fill in the blanks.


Questions and Answers
  • 1. 

    The layer of of ozone gas absorbs -------- rays that comes from the sun to the earth.

    • A.

      Ultraviolet 

    • B.

      X-rays

    • C.

      Cosmic

    • D.

      Atmospheric

    Correct Answer
    A. Ultraviolet 
    Explanation
    Ozone gas in the atmosphere absorbs ultraviolet rays from the sun. Ultraviolet rays are a form of electromagnetic radiation that can be harmful to living organisms. The ozone layer acts as a protective shield, preventing most of these rays from reaching the Earth's surface. This absorption of ultraviolet rays by the ozone layer helps to maintain a suitable environment for life on Earth.

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  • 2. 

    Of the total water available on the earth from water from ------ Percent.

    • A.

      0.4 

    • B.

      0.7

    • C.

      0.1

    • D.

      0.3

    Correct Answer
    D. 0.3
    Explanation
    The correct answer is 0.3. This means that 0.3 percent of the total water available on Earth is from a specific source.

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  • 3. 

    Both ------ and ------ constituents are present in the soil.

    • A.

      Biotic, abiotioc 

    • B.

      Air,water

    • C.

      Gases,air

    • D.

      Oxygen,nitrogen

    Correct Answer
    A. Biotic, abiotioc 
    Explanation
    The correct answer is "biotic, abiotic". Biotic constituents refer to living organisms in the soil, such as plants, animals, and microorganisms. Abiotic constituents, on the other hand, refer to non-living components, such as minerals, rocks, and water. Both biotic and abiotic constituents are essential for the overall health and fertility of the soil.

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  • 4. 

    The atmosphere is the layer of------- that surrounding the earth.

    • A.

      Water

    • B.

      Air

    • C.

      Gas

    • D.

      Earth 

    Correct Answer
    B. Air
    Explanation
    The atmosphere is the layer of air that surrounds the earth. It consists of a mixture of gases, including nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. The atmosphere plays a crucial role in regulating the temperature of the earth, protecting it from harmful solar radiation, and providing the air we breathe.

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  • 5. 

    --------- layer is a protective shell of the earth.

    • A.

      Ultraviolet

    • B.

      Nitrogen

    • C.

      Ozone

    • D.

      Neon

    Correct Answer
    C. Ozone
    Explanation
    Ozone is the correct answer because it is a layer in the Earth's atmosphere that acts as a protective shell. It is located in the stratosphere and absorbs most of the Sun's ultraviolet (UV) radiation, preventing it from reaching the Earth's surface. This absorption of UV radiation by the ozone layer helps to protect living organisms from the harmful effects of excessive UV exposure, such as skin cancer and damage to the environment.

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  • 6. 

    Q.2 True or false. land and soil are the same things.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Land and soil are not the same things. Land refers to the surface of the earth, including all natural and artificial features such as mountains, valleys, and buildings. Soil, on the other hand, is the upper layer of the earth's crust that supports plant growth, consisting of a mixture of minerals, organic matter, water, and air. While soil is a component of land, they are not interchangeable terms.

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  • 7. 

    The water in the lake is called ground water.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is incorrect. The water in the lake is not called ground water. Ground water refers to the water that is stored beneath the Earth's surface in soil or rock formations. The water in the lake is typically referred to as surface water.

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  • 8. 

    It takes about 1000 year to form a 25 cm thick layer of soil.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The given statement is false. It does not take 1000 years to form a 25 cm thick layer of soil. The time required for soil formation depends on various factors such as climate, parent material, vegetation, and topography. In some cases, soil formation can occur relatively quickly, while in others it may take thousands of years. Therefore, it is not accurate to state a specific time frame for the formation of a 25 cm thick layer of soil.

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  • 9. 

    Radon is use in decorative light.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The given statement is incorrect. Radon is not used in decorative light. Radon is a radioactive gas that is naturally present in the environment and is known to be a health hazard. It is not used in any decorative light or any other decorative purposes.

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  • 10. 

    We also look upon this natural components is solid.liquid and gaseous form a resources.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that natural components exist in solid, liquid, and gaseous forms, making them valuable resources. This implies that substances found in nature can be found in various states of matter, such as minerals (solid), water (liquid), and air (gaseous), and can be utilized for various purposes. Therefore, the statement is true.

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  • 11. 

    Q.2 b) observe the picture page no.1( text book) and answer the question. 5 where do we see the birds?

    • A.

      In sky

    • B.

      Water

    • C.

      Land

    • D.

      Tree

    Correct Answer
    A. In sky
    Explanation
    The correct answer is "In sky" because birds are commonly seen flying in the sky. They have the ability to fly and often use the sky as their natural habitat for hunting, migrating, or simply moving from one place to another. While birds can also be found in other locations such as water (for water birds), land, or trees, the most common and general place to see birds is in the sky.

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  • 12. 

    Where is the aeroplane?

    • A.

      Land 

    • B.

      Sky

    • C.

      Water

    • D.

      Earth 

    Correct Answer
    B. Sky
    Explanation
    The correct answer is "sky" because airplanes are typically found in the sky. They are designed to fly and are commonly used for transportation in the air.

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  • 13. 

    On what is the sailboat floating?

    • A.

      Water

    • B.

      Sky

    • C.

      Land

    • D.

      Tree

    Correct Answer
    A. Water
    Explanation
    The sailboat is floating on water because water is a liquid that can support the weight of the boat. Water provides buoyancy to the sailboat, allowing it to stay afloat. The boat displaces an amount of water equal to its weight, creating an upward force that counteracts the force of gravity. This allows the boat to remain on the surface of the water and move through it.

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  • 14. 

    Where are the fish seen?

    • A.

      Land

    • B.

      Sky

    • C.

      Water

    • D.

      Air

    Correct Answer
    C. Water
    Explanation
    Fish are seen in water because they are aquatic creatures that live and survive in aquatic environments. They have adapted to breathe and move in water, using their gills to extract oxygen from the water and fins to swim. Fish are not seen in land, sky, or air as they are not adapted to survive in these environments. Therefore, the correct answer is water.

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  • 15. 

    Where is the cow grassing?

    • A.

      On ground

    • B.

      Water

    • C.

      Sky

    • D.

      Tree.

    Correct Answer
    A. On ground
    Explanation
    The cow is grazing on the ground because that is where grass typically grows. Grazing refers to the act of animals feeding on grass or other vegetation, and this activity usually takes place on land. Cows are herbivores and rely on grass as their primary source of nutrition, so it makes sense that they would graze on the ground where the grass is accessible to them.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 08, 2020
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    Sandip Thakare
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