Heat

Samacheer Book Back Questions And Answers For Science Standard 6 Term 2 “Heat“

I. Choose the correct answer:
1. When an object is heated, the molecules that make up the object _____.
(a) Begin to move faster
(b) Lose energy
(c) Become heavier
(d) Become lighter

2. The unit of heat is _____.
(a) Newton
(b) Joule
(c) Volt
(d) Celsius

3. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be _____.
(a) 80°C
(b) More than 50°C but less than 80°C
(c) 20°C
(d) around 40°C

4. An iron ball at 50°C is dropped in a mug containing water at 50°C. The heat will _____.
(a) Flow from iron ball to water.
(b) Not flow from iron ball to water or from water to iron ball.
(c) Flow from water to iron ball.
(d) Increase the temperature of both.

II. Fill in the Blanks:
1. Heat flows from a _____ body to a _____ body.
2. The hotness of the object is determined by its _____.
3. The SI unit of temperature is _____.
4. Solids _____ on heating and _____ on cooling.
5. Two bodies are said to be in the state of thermal _____ if there is no transfer of heat taking place.

Answers:
1. Hot, Cold
2. Temperature
3. Kelvin
4. Expand, Contract
5. Equilibrium

III. True or False. If False, give the correct answer:
1. Heat is a kind of energy that flows from a hot body to a cold body.
2. Steam is formed when heat is released from water.
3. Thermal expansion is always a nuisance.
4. Borosilicate glass do not expand much on being heated.
5. The unit of heat and temperature are the same.

Answers:
1. True
2. False (Steam is formed when the heat is absorbed from the water)
3. False (Thermal expansion is always not a nuisance)
4. True
5. False (Unit of heat and temperature are not same)

V. Match the following:
1. Heat                              A. 0ºC
2. Temperature                 B. 100ºC
3. Thermal Equilibrium     C. Kelvin
4. Ice cube                        D. No heat flow
5. Boiling water                 E. Joule

Answers:
1. E
2. C
3. D
4. A
5. B

VI. Analogy:
1. Heat: Joule :: Temperature : _____
2. Ice cube : 0°C :: Boiling water : _____
3. Total Kinetic Energy of molecules: Heat:: Average Kinetic Energy : _____

Answers:
1. Kelvin
2. 100° C
3. Temperature

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