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Published on: 06/09/2019
Heat
Download Tamil Nadu 6th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Two bodies are said to be in the state of thermal________ if there is no transfer of heat taking place.
2.
Solids_________ on heating and______ on cooling.
3.
The SI unit of temperature is ________.
4.
The unit of heat and temperature are the same.
5.
Borosilicate glass do not expand much on being heated.
6.
What do you understand by thermal equilibrium?
7.
What is thermal expansion?
8.
What is temperature?
9.
Distinguish between heat and temperature.
10.
What difference do you think heating the solid will make in their molecules ?
11.
Explain thermal expansion with suitable examples.
12.
Suppose your normal body temperature were lower than what it is. How would the sensation of hot and cold change?
13.
An iron ball at 50°C is dropped in a mug containing water at 50o C. The heat will
flow from iron ball to water
not flow from iron ball to water or from water to iron ball
flow from water to iron ball
increase the temperature of both
14.
One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be
80o C
More than 50°C but less than 80o C
20o C
around 40o C
15.
When an object is heated, the molecules that make up the object
begin to move faster
lose energy
become heavier
become lighter
1.
( )
thermal equilibrium
2.
( )
expand, contract
3.
( )
kelvin
4.
False - Correct statement: The unit of heat and temperature are not the same. (or) The unit of heat and temperature are different
5.
True
6.
Thermal equilibrium exists when two objects in thermal contact no longer affect each other's temperature.
7.
The expansion of a substance on heating is called, the thermal expansion of that substance.
8.
(i) The measurement of warmness or coldness of a substance is known as its Temperature.
(ii) SI unit of temperature is kelvin
9.
| HEAT | TEMPERATURE |
| i) Heat is an energy | The measurement of warmness or coldness of a substance |
| ii) Heat not only depends on the temperature of the substance but also depends on how many molecules are there in the object | Temperature is related to how fast the atoms or molecules move or vibrate within the substance. |
| iii) Heat measures the total kinetic energy of molecules | Temperature measures the average kinetic energy of molecules |
| iv) SI unit of heat is Joule | SI unit of temperature is kelvin |
10.
The molecules in the solid move faster and vibrate when heating. Spread apart and occupy more space. So solid expands when heated.
11.
The expansion of substance on heating is called, the thermal expansion of that substance
(i) Gaps are left in between rails while laying railway track :
So that there is enough margin for the tracks to expand and contract due to the temperature changes. If that gap is not left then the tracks might have enormous stress in them while expanding due to heat, which can damage them.
(ii) Gaps are left in between two joints of a concrete bridge:
Thermal expansion takes place due to the increase in the kinetic energy of the constituent molecules as they are heated. Thermal expansion is the reason we leave some gaps between section of h concrete bridge.
12.
We feel hot because the heat is transferred from atmosphere to your body. Heat energy flows from higher temperature to lower temperature.
13.
(b)
not flow from iron ball to water or from water to iron ball
14.
(d)
around 40o C
15.
(a)
begin to move faster
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Tamilnadu Stateboard 6th Standard Subjects
Tamilnadu Stateboard Standards