Observe the diagram and answer the given questions below it.i. Label

1.	Observe the diagram and answer the given questions below it.i. Label parts 1 – 4ii. What is the principle of this object?iii. State the uses of the given object.iv. What is an infrared camera?v. What is thermoware?
Answer» i. 1. Vacuum 2. metal/plastic jar 3. Spring 4. silvered surface of the glass. ii. As there is no medium in the vacuum between the two bottles, no transfer of heat takes place due to conduction and convection and radiated heat is reflected back by the shiny surface. iii. The temperature of substances inside it are maintained for some time. Hot things remain hot and cold things cold for 2 – 3 hours. iv. It is a camera which uses radiations to make our surroundings visible at night. Using this camera, it is possible to keep a watch on the movements of the enemy during the night. v. Thermoware are object which do not allow heat to escape from them. So things stay warm in them. eg. hot pot, thermos flask.

Observe the diagram and answer the given questions below it.i. Label parts 1 – 4ii. What is the principle of this object?iii. State the uses of the given object.iv. What is an infrared camera?v. What is thermoware?

Answer»

i. 1. Vacuum

2. metal/plastic jar

3. Spring

4. silvered surface of the glass.

ii. As there is no medium in the vacuum between the two bottles, no transfer of heat takes place due to conduction and convection and radiated heat is reflected back by the shiny surface.

iii. The temperature of substances inside it are maintained for some time. Hot things remain hot and cold things cold for 2 – 3 hours.

iv. It is a camera which uses radiations to make our surroundings visible at night. Using this camera, it is possible to keep a watch on the movements of the enemy during the night.

v. Thermoware are object which do not allow heat to escape from them. So things stay warm in them. eg. hot pot, thermos flask.

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