Thermal Equilibrium
Physics ⇒ Heat and Thermodynamics
Thermal Equilibrium starts at 8 and continues till grade 12.
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See sample questions for grade 10
A metal block at 80 °C is placed in water at 20 °C. After some time, both reach 30 °C. What is the final state called?
A scientist places a thermometer in a beaker of liquid. After a few minutes, the thermometer reads a constant value. What does this indicate about the thermometer and the liquid?
Describe a real-life situation where thermal equilibrium is reached.
Describe what happens to the net heat flow between two objects once they reach thermal equilibrium.
A 2 kg block of iron at 100 °C is placed in 1 kg of water at 20 °C. If no heat is lost to the surroundings, what is the final temperature when thermal equilibrium is reached? (Specific heat of iron = 450 J/kg·K, water = 4200 J/kg·K)
A 200 g piece of metal at 120 °C is placed in 100 g of water at 20 °C. The final temperature is 30 °C. If the specific heat of the metal is 400 J/kg·K, calculate the heat gained by the water. (Specific heat of water = 4200 J/kg·K)
A 500 g block of copper at 150 °C is placed in 1 kg of water at 25 °C. If the final temperature is 30 °C, calculate the amount of heat lost by the copper. (Specific heat of copper = 390 J/kg·K)
A metal block at 80 °C is placed in water at 20 °C. After some time, both reach 30 °C. What is the final state called?
Which law of thermodynamics defines the concept of temperature?
(1) First Law
(2) Second Law
(3) Zeroth Law
(4) Third Law
Which of the following best describes the condition for thermal equilibrium?
(1) Both objects have the same mass
(2) Both objects have the same temperature
(3) Both objects are made of the same material
(4) Both objects have the same color
Which of the following is an example of thermal equilibrium?
(1) Ice melting in a glass of water
(2) A hot pan cooling down in air
(3) A room where all objects are at the same temperature
(4) A cup of coffee just poured
Which of the following is NOT a requirement for two bodies to reach thermal equilibrium?
(1) They must be in thermal contact
(2) They must be at the same temperature
(3) They must be made of the same material
(4) There must be no net heat flow between them
Fill in the blank: At thermal equilibrium, the temperature of all objects in contact is ______.
Fill in the blank: The Zeroth Law of Thermodynamics helps us define the concept of ______.
Fill in the blank: When two objects are in thermal equilibrium, their temperatures are ______.
When two objects at different temperatures are placed in contact, heat will flow from the object at ______ temperature to the object at ______ temperature until thermal equilibrium is reached.
If object A is in thermal equilibrium with object B, and object B is in thermal equilibrium with object C, are objects A and C in thermal equilibrium?
True or False: If two objects are in thermal equilibrium, there is no net flow of heat between them.
True or False: The concept of thermal equilibrium applies only to solids.
True or False: The concept of thermal equilibrium is important in designing thermometers.
