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Sources of Energy Test - 22

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Sources of Energy Test - 22
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  • Question 1
    1 / -0
    Define biomass.
    Solution
    The waste and dead parts of living beings is called biomass. Wastes and dead parts of living being buried deep inside the earth turns up into fossil fuels after a long time.
  • Question 2
    1 / -0
    Which of the following is / are disadvantage of building large dams for generating hydro electric power?
    Solution

    The construction of dams for generating hydroelectric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

    A) disturbance of the natural ecosystem in the surrounding forest area.

    B) disruption of the plants and animals life.

    C) displacement of people on a large scale.

    D) disruption of the aquatic ecosystem.

    Option D.

  • Question 3
    1 / -0
    Construction of dams
    Solution

    $$\underline{\text{Advantages of construction of dams:}}$$

    A) generation of hydro energy and use of it in the generation of electricity

    B) Hydro energy is cleaner as compared to fossil fuels

    C) Hydro energy is not exhaustible

    $$\underline{\text{Disadvantages of construction of dams:}}$$

    A) disturbance of the natural ecosystem in the surrounding forest area

    B) disruption of the plants and animals life

    C) displacement of people on a large scale

    D) disruption of the aquatic ecosystem.

    So,construction of dams has both advantages and disadvantages

  • Question 4
    1 / -0
    Define renewable sources of energy.
    Solution
    A natural source of energy that can provide us energy continuously without being exhausted is called a renewable source of energy.
  • Question 5
    1 / -0
    Global warming is caused due to:
    Solution
    Global warming is caused due to the greenhouse effect. Earth's atmosphere allows infrared radiations (heat radiations) to pass through it and reach the Earth's surface. When these rays are reflected back from the earth's surface, most of the heat is absorbed by greenhouse gases. This raises the temperature of the Earth's atmosphere.
  • Question 6
    1 / -0
    Define air pollutants.
    Solution
    Air pollution refers to any physical, chemical or biological change in the air. It is the contamination of air by harmful gases, dust and smoke which affects plants, animals and humans drastically. 
    Air pollution is caused by mixing up of air with materials injurious to health and causes inconvenience to animals and plants. The substances that cause air pollution are called air pollutants. 
  • Question 7
    1 / -0
    Rise of ocean level is called ________ and fall of ocean level is called ________.
    Solution
    Tides are the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon, Sun, and rotation of the Earth. The effect of the moon is the most prominent among all the factors. The rise of ocean level is called high tide and the fall of ocean level is called low tide.
  • Question 8
    1 / -0
    What is not an effect of global warming?
    Solution
    Some of the effects of global warming are:
    1. Increases in the temperature of the Earth
    2. Melting of glaciers in polar caps and mountains
    3. Rise in water levels in rivers and seas
    4. Flooding 
    5. Speeding up of water cycle and more precipitation leading to flooding
    6. Skin diseases due to excessive heat on the surface of the Earth.
    Whereas Earthquakes are mostly caused due to tectonic movements or explosions inside the Earth's surface.
  • Question 9
    1 / -0
    Kinetic energy possessed by fast moving oceanic waves is called:
    Solution
    Due to the wind blowing on the surface of oceans, waves move at high speed on their surface which is called the oceanic waves. The kinetic energy possessed by fast-moving oceanic waves is called oceanic waves energy.
  • Question 10
    1 / -0
    The use of conventional sources of energies is not responsible for:
    Solution
    Conventional sources of energy are coal, gas, and petroleum. Extraction or generation of such sources causes pollution and releases gases like $$CH_4\ \& \ CO_2$$ causing global warming and the greenhouse effect.
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