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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 option '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.
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Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
Explanation:
To explain why the correct answer is option 'D' (Conduction), let's understand the different processes of heat transfer.
1. Conduction: It is the process of heat transfer through direct contact between particles of a substance. In metals, heat is primarily conducted through the free electrons present in them. When one part of a metal is heated, the kinetic energy of the atoms increases, causing them to vibrate. These vibrations are passed on to neighboring atoms, and this transfer of energy continues until it reaches the other end of the metal. This is how heat is conducted in metals.
2. Convection: It is the process of heat transfer in liquids and gases. In convection, heat is transferred through the movement of the heated substance itself. When a liquid or gas is heated, its particles gain kinetic energy and move faster. The hotter and less dense regions rise, while the cooler and denser regions sink, creating a circulation pattern. This circulation transfers heat from one place to another.
3. Radiation: It is the process of heat transfer through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium to transfer heat. Heat energy is emitted in the form of electromagnetic waves, which can travel through vacuum as well as transparent substances. For example, the heat from the Sun reaches the Earth through radiation.
In the given options, the correct answer is 'D' (Conduction) because heat in metals is primarily conducted through the process of conduction. Metals are good conductors of heat because they have free electrons that can easily transfer heat energy from one part to another through direct contact. This is why metals feel hot when heated at one end, as the heat is conducted throughout the metal.
To summarize:
- Heat in metals is conducted through the process of conduction.
- Conduction is the transfer of heat through direct contact between particles of a substance.
- In metals, heat is primarily conducted by the free electrons present in them.
- Convection is the transfer of heat in liquids and gases through the movement of the heated substance itself.
- Radiation is the transfer of heat through electromagnetic waves and does not require a medium.
Additional Information:
- It is important to note that different materials have different abilities to conduct heat. Metals are good conductors of heat, while materials like wood and plastic are poor conductors, known as insulators.
To explain why the correct answer is option 'D' (Conduction), let's understand the different processes of heat transfer.
1. Conduction: It is the process of heat transfer through direct contact between particles of a substance. In metals, heat is primarily conducted through the free electrons present in them. When one part of a metal is heated, the kinetic energy of the atoms increases, causing them to vibrate. These vibrations are passed on to neighboring atoms, and this transfer of energy continues until it reaches the other end of the metal. This is how heat is conducted in metals.
2. Convection: It is the process of heat transfer in liquids and gases. In convection, heat is transferred through the movement of the heated substance itself. When a liquid or gas is heated, its particles gain kinetic energy and move faster. The hotter and less dense regions rise, while the cooler and denser regions sink, creating a circulation pattern. This circulation transfers heat from one place to another.
3. Radiation: It is the process of heat transfer through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium to transfer heat. Heat energy is emitted in the form of electromagnetic waves, which can travel through vacuum as well as transparent substances. For example, the heat from the Sun reaches the Earth through radiation.
In the given options, the correct answer is 'D' (Conduction) because heat in metals is primarily conducted through the process of conduction. Metals are good conductors of heat because they have free electrons that can easily transfer heat energy from one part to another through direct contact. This is why metals feel hot when heated at one end, as the heat is conducted throughout the metal.
To summarize:
- Heat in metals is conducted through the process of conduction.
- Conduction is the transfer of heat through direct contact between particles of a substance.
- In metals, heat is primarily conducted by the free electrons present in them.
- Convection is the transfer of heat in liquids and gases through the movement of the heated substance itself.
- Radiation is the transfer of heat through electromagnetic waves and does not require a medium.
Additional Information:
- It is important to note that different materials have different abilities to conduct heat. Metals are good conductors of heat, while materials like wood and plastic are poor conductors, known as insulators.
Community Answer
Practice Quiz or MCQ (Multiple Choice Questions) with solutions are av...
Heat energy can move through a substance by conduction. Metals are good conductors of heat but non-metals and gases are usually poor conductors of heat. Poor conductors ofheat are called insulators. Heat energy isconducted from the hot end of an object to the cold end.
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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 option 'D'. Can you explain this answer?
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