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Heat Book Back Questions & Answers, Exercises, Solutions, Tests, Quizzes, Videos and Podcasts for Class 9 | Unit 7 | Physics | Science | Samacheer Kalvi – English Medium

Samacheer Kalvi New Book Back Questions & Answers: https://www.thelearning.app/samacheer-kalvi-english-medium/class-9/science-4/heat/exercises

Podcasts: https://www.thelearning.app/samacheer-kalvi-english-medium/class-9/science-4/heat/videos

Tests & Quizzes: https://www.thelearning.app/samacheer-kalvi-english-medium/class-9/science-4/heat/tests

Flash Cards: https://www.thelearning.app/samacheer-kalvi-english-medium/class-9/science-4/heat/flashcards

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00:00 Introduction
00:10 Choose the correct answer
01:56 Fill in the blanks
02:32 Assertion and reason

Questions answered in this video –

1. Calorie is the unit of

2. SI unit of temperature is

3. Two cylindrical rods of same length have the area of cross section in the ratio 2:1. If both the rods are made up of same material, which of them conduct heat faster?

4. In which mode of transfer of heat, molecules pass on heat energy to neighbouring molecules without actually moving from their positions?

5. A device in which the loss of heat due to conduction, convection and radiation is minimized is

6. The fastest mode of heat transfer is______ .

7. During day time, air blows from _______ to _______ .

8. Liquids and gases are generally _______conductors of heat.

9. The fixed temperature at which matter changes state from solid to liquid is called _______

10. (A): Food can be cooked faster in vessels with copper bottom… (R): Copper is the best conductor of heat.

11. (A): Maximum sunlight reaches earths surface during the noon time.. (R): Heat from the sun reaches earths surface by radiation.

12. (A): When water is heated up to 100oC, there is no raise in temperature until all water gets converted into water vapour… (R): Boiling point of water is 10C.

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