Temperature heat class 7 detailed ppt. pptx

class 7 heat & Temperature

1. Heat is a form of _______ Ans : energy

2. The S.I. unit of heat_______ Ans : joule

3. 1 joule = _______ cal Ans : 0.24

4. Heat is a form of energy because ___________ Ans : It has the capacity to do work

5. Write True/ False On touching a lump of ice, we feel cold because some heat passes from our body to the ice Ans : True

6. Write True/ False Heat flows from a body at a lower temperature to a body at a higher temperature when they are kept in contact Ans : False

7. List any two sources of heat Ans : Sun, fire, electricity, human body, chemical reactions, friction

8. List any two applications of heat Ans : cooking, food preservation, power generation, transportation

9. Temperature Temperature is the degree of hotness or coldness of a body When a body is heated, its temperature rises and when it is cooled, its temperature falls

10. Units of Temperature Degree Celsius ( C) Degree Fahrenheit ( F) Kelvin (K) – S.I. unit

11. Difference between heat and temperature Heat Temperature It is a form of energy It is the degree of hotness or coldness of a body Flows from a hot body to a cold body Rises when heated and falls when cooled It is a cause It is an effect It is measured in joules It is measured in Kelvin

12. T hermometer

13. Why Mercury??? Liquid at room temperature Good conductor of heat High boiling point Consistent expansion

14. Parallax error

15. Types of thermometer Clinical thermometer

16. Laboratory thermometer

17. Digital thermometer

18. Infrared thermometer Infrared Ear thermometer

19. Magic Mug