Q.6: Explain an activity to show:
1- Law of conservation of mechanical energy.
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2- The idea working of simple electric cell.
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3- Electric circulation.
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Q.7: Mention 3 harms of technology applications of energy transformation.
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Q.8: On operating a car engine, several transformations of energy take place. Mention some of these transformations explain this with a simple diagram.
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Lesson 3
Q.1: What is the scientific term for each of the following…?
1- The process results in transformation of mechanical energy into heat energy
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2- Heat transfers through solids from one end to another. [-----------------------]
3- Heat transfers without any need for a material medium. [----------------------]
4- Heat transfers through gas & liquid media. [---------------------------]
5- It is the condition which states the direction of heat energy from or to the object when it comes in contact with another. [----------------------------]
6- It is a form of energy which transfers from higher temperature to a lower one. [----------------------------]
Q.2: Give reason:
1- The temperature of the bicycle tire increases during using of the brakes.
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2- The freezer found at the top of the fridge.
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3- Electric heater found on the floor of the room not at the top.
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4- It is preferable to use solar heater than both electric heater and petroleum heater.
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Q.3: Put () or (X) with correction:
1- Heat transfers from lower temperature to higher temperature. ( )
2- Temperature is raised as speed of spheres increases. ( )
3- Density of heated molecules is higher than cooled molecules. ( )
4- Petrol fuel is one of the non permanent resources of energy. ( )
5- Solar energy is one of the permanent resources of energy. ( )
6- Transferring of heat by conduction doesn't need to media to transfer through. ( )
7- Transferring of heat by radiation needs media to transfer through. ( )
8- Friction turns mechanical energy into heat energy. ( )
9- Convection takes place through solids. ( )