Heat Book Back Questions & Answers
Unit 1 > Science > Class 6 > Samacheer Kalvi - English Medium
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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
Correct answer: a. begin to move faster
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2. The unit of heat is
a. newton
b. joule
c. volt
d. celsius
Correct answer: b. joule
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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
Correct answer: d. around 40°C
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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
Correct answer: b. not flow from iron ball to water or from water to iron ball.
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1. Heat flows from a ____________ body to a ____________ body.
Correct answer: higher temperature, lower temperature
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2. The hotness of the object is determined by its _______________
Correct answer: temperature
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3. The SI unit of temperature is ________
Correct answer: kelvin
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4. Solids________________ on heating and______________ on cooling.
Correct answer: expand, contract
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5. Two bodies are said to be in the state of thermal______________ if there is no transfer of heat taking place
Correct answer: equilibrium
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1. Heat is a kind of energy that flows from a hot body to a cold body.
Correct answer: True
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2. Steam is formed when heat is released from water.
Correct answer: False
Correct Statement: Ice is formed when heat is released from water
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3. Thermal expansion is always a nuisance.
Correct answer: FALSE
Correct Statement: Thermal expansion is always a beneficial
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4. Borosilicate glass do not expand much on being heated.
Correct answer: True
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5. The unit of heat and temperature are the same.
Correct answer: False
Correct Statement: The SI unit of heat is joule. The SI unit of temperature is Kelvin
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1. Heat
Correct answer: joule
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2. Temperature
Correct answer: kelvin
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3. Thermal Equilibrium
Correct answer: No heat flow
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4. Ice cube
Correct answer: 0°C
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5. Boiling water
Correct answer: 100°c
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1. Heat : Joule :: Temperature : _____________
Correct answer: Kelvin
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2. ice cube : 0°C :: Boiling water :_____________
Correct answer: 100°C
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3. Total Kinetic Energy of molecules: Heat :: Average Kinetic Energy : __________
Correct answer: Temperature