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1. Thermal energy flows between objects due to difference in _____________.
2. When a liquid is heated it _____________.
3. Convection current gives rise to _____________.
4. Dark colours are good _____________ of heat.
5. The degree of hotness or coldness in a substance is called _____________.
6. _____________ is a conductor of heat.
7. The thermos flask is made up of double walled glass vessels because glass is _____________.
8. In solids transter of heat can take place by _____________.
9. Mercury is a liquid metal in _____________.
10. The form of energy that flows from hot object to a cold object is called _____________.
11. The boiling point of water in the Celsius scale is _____________.
12. The transfer of energy between object that are in physical contact is by ___________.
13. The ___________ in a clinical thermometer prevents backflow of the Mercury into the bulb.
14. The handle of cooking utensils are made of material that are___________.
15. The vacuum in a thermos flask reduces the heat loss due to___________.
1. Thermal energy flows between objects due to difference in temperature.
2. When a liquid is heated it expands.
3. Convection current gives rise to breeze.
4. Dark colours are good absorbers of heat.
5. The degree of hotness or coldness in a substance is called temperature.
6. Copper is a conductor of heat.
7. The thermos flask is made up of double walled glass vessels because glass is poor conductor of heat.
8. In solids transter of heat can take place by conduction.
9. Mercury is a liquid metal in liquid form at room temperature.
10. The form of energy that flows from hot object to a cold object is called heat.
11. The boiling point of water in the Celsius scale is 100 degree Celsius.
12. The transfer of energy between object that are in physical contact is by radiation.
13. The kink in a clinical thermometer prevents backflow of the Mercury into the bulb.
14. The handle of cooking utensils are made of material that are insulator.
15. The vacuum in a thermos flask reduces the heat loss due to convection.
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