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4 questions · timed · auto-graded

Question 13 Marks
Hydroelectricity is considered a good energy option for the future. Why?
Answer
Hydropower is fueled by water, so it’s a clean fuel source, meaning it won’t pollute the air like power plants that bum fossil fuels, such as coal or natural gas.
Hydroelectric power is a domestic source of energy, allowing each state to produce its own energy without being reliant on international fuel sources.
The energy generated through hydropower relies on the water cycle, which is driven by the sun, making it a renewable power source, making it a more reliable and affordable source than fossil fuels that are rapidly being depleted.
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Question 23 Marks
Discuss the ways by which you can conserve energy, especially petroleum and electricity, in your homes and school. What changes do you need to make in your daily routine to save these precious resources?
Answer
I would preferably follow all the ways mentioned in the question to conserve energy.
  1. Careful use of petroleum and electricity : One should preferably use bicycle or barefoot for shorter distances instead of cars. One must switch off the switches when lights/fans are not required.
  2. Careful use of water when washing and gardening : One should properly utilise the water while washing clothes and gardening. Do not keep the taps open and waste water.
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Question 33 Marks
What do you know about wind energy?
Answer
The wind is used to produce electricity. When the wind blows, it turns the three large blades of the windmill which are attached to the turbine. The turbine, which is connected to the generator converts the energy of the wind into electrical energy.
Wind, like the sun, is nature’s gift to the earth. It is free and widely available.
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Question 43 Marks
Explain briefly geothermal energy.
Answer
Geothermal energy is the energy generated by harnessing the heat in the interiors of the earth. The earth has very hot materials below the crust. They heat up groundwater to produce hot water and steam. This hot water and steam gush up in many places as springs and geysers, which may be used to run turbines to generate electricity.
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[3 Mark Question Answer] - Geography STD 7 Questions - Vidyadip