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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are available for Practice, which would help you prepare for chapter Heat, Class 7, Science. You can practice these practice quizzes as per your speed and improvise the topic.
Q.
The heat in metals is conducted by the process of
- a)Absorption
- b)Radiation
- c)Convection
- d)Conduction
Correct answer is 'D'. Can you explain this answer?
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Verified Answer
Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
The heat in metals is conducted by the process of conduction in which molecules in contact transfer heat to adjacent molecules.
Most Upvoted Answer
Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
Explanation:
The correct answer is 'D) Conduction'.
Conduction:
- Conduction is the process of heat transfer through direct contact between particles of a substance.
- In metals, heat is primarily conducted through the movement of free electrons.
- Metals have free electrons that are not bound to any particular atom and are free to move within the metal lattice.
- When one part of the metal is heated, the free electrons gain kinetic energy and move faster.
- These electrons collide with neighboring atoms, transferring their kinetic energy to them.
- This collision and transfer of energy continue, creating a chain reaction and causing the heat to be conducted throughout the metal.
- Thus, the heat in metals is conducted by the process of conduction.
Comparison with other options:
- Absorption: Absorption refers to the process of taking in heat or energy from the surroundings. However, in the context of heat transfer in metals, absorption is not the primary mechanism by which heat is conducted.
- Radiation: Radiation is the transfer of heat through electromagnetic waves. While radiation plays a role in heat transfer, it is not the primary mechanism in metals. Metals primarily transfer heat through conduction.
- Convection: Convection is the transfer of heat through the movement of fluid or gases. While convection can occur in fluids and gases, it is not the primary mechanism for heat transfer in metals.
Conclusion:
- The heat in metals is primarily conducted through the process of conduction, where heat is transferred through direct contact between particles of the metal.
- This mechanism involves the movement of free electrons within the metal lattice, which collide with neighboring atoms and transfer their kinetic energy, causing the heat to be conducted throughout the metal.
The correct answer is 'D) Conduction'.
Conduction:
- Conduction is the process of heat transfer through direct contact between particles of a substance.
- In metals, heat is primarily conducted through the movement of free electrons.
- Metals have free electrons that are not bound to any particular atom and are free to move within the metal lattice.
- When one part of the metal is heated, the free electrons gain kinetic energy and move faster.
- These electrons collide with neighboring atoms, transferring their kinetic energy to them.
- This collision and transfer of energy continue, creating a chain reaction and causing the heat to be conducted throughout the metal.
- Thus, the heat in metals is conducted by the process of conduction.
Comparison with other options:
- Absorption: Absorption refers to the process of taking in heat or energy from the surroundings. However, in the context of heat transfer in metals, absorption is not the primary mechanism by which heat is conducted.
- Radiation: Radiation is the transfer of heat through electromagnetic waves. While radiation plays a role in heat transfer, it is not the primary mechanism in metals. Metals primarily transfer heat through conduction.
- Convection: Convection is the transfer of heat through the movement of fluid or gases. While convection can occur in fluids and gases, it is not the primary mechanism for heat transfer in metals.
Conclusion:
- The heat in metals is primarily conducted through the process of conduction, where heat is transferred through direct contact between particles of the metal.
- This mechanism involves the movement of free electrons within the metal lattice, which collide with neighboring atoms and transfer their kinetic energy, causing the heat to be conducted throughout the metal.
Community Answer
Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
because in conduction heat is transfer from molecules to molecules without any movement of molecules
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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are available for Practice, which would help you prepare for chapter Heat, Class 7, Science. You can practice these practice quizzes as per your speed and improvise the topic.Q.The heat in metals is conducted by the process ofa)Absorptionb)Radiationc)Convectiond)ConductionCorrect answer is 'D'. Can you explain this answer?
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