Physics
Grade-9
Easy
Question
When a thermometer is dipped in a tumbler of cool water, its mercury level comes down. This is due to ____.
- Thermal expansion
- Thermal contraction
- Increase in its volume
- Change in its chemical composition
Hint:
When the thermometer is placed in cold water, the molecules slow down and their attractions bring them a little closer
The correct answer is: Thermal contraction
- When the thermometer is placed in cold water, the molecules slow down and their attractions bring them a little closer together bringing them down the tube.
- Hence it is Thermal Contraction because it is a decrease in a material's volume when its temperature decreases. As the temperature decreases, the average kinetic energy of the particles decreases and they slow down and get closer together thereby decreasing the volume of the material.
Related Questions to study
Physics
When the temperature of a substance increases, it ____.
When the temperature of a substance increases, it ____.
PhysicsGrade-9
Physics
As a result of thermal expansion, liquids experience a change in _____.
As a result of thermal expansion, liquids experience a change in _____.
PhysicsGrade-9
Physics
Thermal expansion occurs in _____.
Thermal expansion occurs in _____.
PhysicsGrade-9
Physics
In order to maintain the temperature of an isothermal system constant, ____.
In order to maintain the temperature of an isothermal system constant, ____.
PhysicsGrade-9
Physics
The picture below represents an ______ process.
The picture below represents an ______ process.
PhysicsGrade-9
Physics
The picture below represents an ______ process.
The picture below represents an ______ process.
PhysicsGrade-9
Physics
The picture below represents an ______ process.
The picture below represents an ______ process.
PhysicsGrade-9
Physics
The picture below represents an ______ process.
The picture below represents an ______ process.
PhysicsGrade-9
Physics
Resistance is a/an ____ property and resistivity is a/an ____ property.
Resistance is a/an ____ property and resistivity is a/an ____ property.
PhysicsGrade-9
Physics
The volume of a system is different from its other properties, such as pressure, temperature, and density, as it is a/an ____.
The volume of a system is different from its other properties, such as pressure, temperature, and density, as it is a/an ____.
PhysicsGrade-9
Physics
Pick the odd one out.
Pick the odd one out.
PhysicsGrade-9
Physics
In a closed system, _______ can get into or out of the system.
In a closed system, _______ can get into or out of the system.
PhysicsGrade-9
Physics
When a change of state is observed in a system, ________ is said to occur.
When a change of state is observed in a system, ________ is said to occur.
PhysicsGrade-9
Physics
The following picture represents a/an _____.
The following picture represents a/an _____.
PhysicsGrade-9
Physics
In the system (water inside an air-tight copper bottle) shown below, ______ can be exchanged with the surroundings.
In the system (water inside an air-tight copper bottle) shown below, ______ can be exchanged with the surroundings.
PhysicsGrade-9
