1. In order to increase the amount of work done, what should you do?
a) Increase the distance over which the force is applied.
b) Decrease the force applied.
c) Decrease the time taken to perform the work.
d) Keep the force and distance the same.
Answer: a) When the distance over which a force is applied increases, more work is done because the force is exerted over a larger distance. This allows for more energy to be transferred and more work to be accomplished.
2. Which experiment can demonstrate the conversion of light energy to thermal energy?
a) Burning a candle
b) Heating water using a solar panel
c) Turning on a switch to light an LED bulb
d) Observing the movement of windmill blades
Answer: b) A solar panel absorbs sunlight (light energy) and converts it into thermal energy, which can be used to heat water. This demonstrates the conversion of one form of energy (light) into another form (thermal).
3. Three friends, Miranda, Ethan, and Lizzy made comments about the conservation of energy. This is what they said:
Miranda: Energy can be created or destroyed.
Ethan: Work can be done with or without energy.
Lizzy: Energy can be converted from one form to another.
Who made the correct statement?
a) Only Miranda
b) Only Ethan
c) Only Lizzy
d) Ethan And Lizzy
Answer: c) Only Lizzy made the correct statement. Energy can indeed be converted from one form to another, as stated by Lizzy. Miranda's statement contradicts the principle of conservation of energy, which states that energy cannot be created or destroyed. Ethan's statement is incorrect because work requires the use of energy.
4. Which of the following is an example of a non-renewable energy source that is used for cooking?
a) Biomass
b) Hydroelectric power
c) Geothermal energy
d) Charcoal
Answer: d) Charcoal is derived from wood and is a non-renewable energy source. It is commonly used for cooking, especially in barbecues and grills.
5. Match the following types of energy with their corresponding examples:
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Column I
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Column II
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1. Kinetic Energy
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A) A stretched rubber band
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2. Potential Energy
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B) Heat from a burning fire
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3. Thermal Energy
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C) A moving car
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4. Chemical Energy
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D) Batteries in a flashlight
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a) 1:A, 2:C, 3:D, 4:B
b) 1:B, 2:A, 3:C, 4:D
c) 1:D, 2:B, 3:A, 4:C
d) 1:C, 2:A, 3:B, 4:D
Answer: d) Kinetic Energy: A moving car
Potential Energy: A stretched rubber band
Thermal Energy: Heat from a burning fire
Chemical Energy: Batteries in a flashlight
FAQs
1. What is Geothermal Energy?
The heat that originates from the Earth's interior is known as geothermal energy. It can produce energy and heat buildings and is present in rocks and liquids beneath the surface of the Earth.
2. What is Mechanical Energy?
The energy connected to an object's motion or location is known as mechanical energy. Whether an item is moving, lifting, or pushing anything, it is made possible by energy.
The two forms of Mechanical energy are:
- Kinetic energy and
- potential energy
3. What is Conservation of Energy?
According to the scientific theory of conservation of energy, energy can only change forms; it cannot be generated or destroyed. This indicates that the overall energy content of a closed system doesn't change over time. To put it another way, energy may be compared to a magical money that is neither lost nor generated out of thin air.
4. What is Kinetic Energy?
The energy that an object has because it is moving is known as kinetic energy. Kinetic energy is the force that propels an item through space. An item has more kinetic energy the quicker it goes and the heavier it is.
5. What are few examples of Renewable and Non-renewable Energy?
Examples of Renewable Energy Sources:
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Solar Energy
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Wind Energy
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Hydropower
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Biomass Energy
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Geothermal Energy
Examples of Non-Renewable Energy Sources:
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Fossil Fuels
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Nuclear Energy
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Tar Sands and Oil Shale
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Natural Gas Hydrates
