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Good and Bad Insulators of Heat Video Lecture | Science Class 7 (Old NCERT)
FAQs on Good and Bad Insulators of Heat Video Lecture - Science Class 7 (Old NCERT)
| 1. What are the good insulators of heat? |  |
Ans. Good insulators of heat include materials such as wood, rubber, plastic, and air. These substances have high resistance to the flow of heat and can effectively prevent the transfer of thermal energy.
| 2. What are the bad insulators of heat? | |
Ans. Bad insulators, also known as conductors of heat, allow the transfer of thermal energy easily. Examples of bad insulators include metals like copper, aluminum, and iron. These materials have low resistance to heat flow and are efficient conductors.
| 3. Why are wood and air considered good insulators of heat? | |
Ans. Wood and air are considered good insulators of heat due to their low thermal conductivity. Wood has a cellular structure with air pockets that trap heat and hinder its transfer. Similarly, air is a poor conductor of heat, and when trapped in spaces or between objects, it acts as an insulating layer.
| 4. How do insulators help in maintaining temperature? | |
Ans. Insulators help in maintaining temperature by reducing heat transfer between different objects or environments. When insulating materials are used to cover or enclose an area, they prevent the loss or gain of heat, thereby maintaining the desired temperature inside the space.
| 5. Can insulators be used in electrical applications? | |
Ans. Yes, insulators are commonly used in electrical applications to prevent the flow of electricity. Materials such as rubber, plastic, and glass are excellent electrical insulators as they have high resistance to the flow of electric current. They help in insulating wires, cables, and electrical components, ensuring safety and preventing electrical accidents.
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