Opaque materials are those that do not permit light to pass through them, making them unable to see through. This lack of transparency occurs because their internal structure either scatters or absorbs light rather than letting it travel through. For example, materials like wood, metal, and concreteRead more
Opaque materials are those that do not permit light to pass through them, making them unable to see through. This lack of transparency occurs because their internal structure either scatters or absorbs light rather than letting it travel through. For example, materials like wood, metal, and concrete are opaque because their dense, irregular structures prevent light from passing through. As a result, objects behind opaque materials are not visible.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
Materials are integral to everyday life, serving numerous functions in various applications. For instance, cotton and wool are used in clothing for comfort and warmth, while materials like bricks and cement are used in building houses and infrastructure. Metals and plastics are commonly used in tranRead more
Materials are integral to everyday life, serving numerous functions in various applications. For instance, cotton and wool are used in clothing for comfort and warmth, while materials like bricks and cement are used in building houses and infrastructure. Metals and plastics are commonly used in transportation vehicles, packaging, and electronics. The choice of materials affects the performance, durability, and functionality of the items we use daily, making them essential for daily tasks and modern living.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
In technology, materials play a critical role by providing essential properties required for various applications. Semiconductors, such as silicon, are used in electronics to control electrical currents and enable functionality. Metals are used for their strength and durability in components like caRead more
In technology, materials play a critical role by providing essential properties required for various applications. Semiconductors, such as silicon, are used in electronics to control electrical currents and enable functionality. Metals are used for their strength and durability in components like casings and connectors, while polymers are used for their flexibility and insulating properties in wiring and housings. The choice of material affects the performance, efficiency, and reliability of technological devices and systems.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
The environmental impact of materials depends on their production, use, and disposal. Plastics can contribute to environmental pollution, as they often do not biodegrade and accumulate in landfills and oceans. Metals require extensive mining and processing, which can deplete natural resources and coRead more
The environmental impact of materials depends on their production, use, and disposal. Plastics can contribute to environmental pollution, as they often do not biodegrade and accumulate in landfills and oceans. Metals require extensive mining and processing, which can deplete natural resources and consume significant energy. Sustainable practices, such as recycling, using renewable resources, and reducing waste, aim to mitigate these impacts and promote environmental stewardship in material use and production.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
An increase in the temperature of an object means that the thermal energy has increased; option [D]. Temperature is a measure of the average kinetic energy of the molecules within an object. As temperature rises, the molecules move faster, increasing the object's overall thermal energy. Thermal enerRead more
An increase in the temperature of an object means that the thermal energy has increased; option [D]. Temperature is a measure of the average kinetic energy of the molecules within an object. As temperature rises, the molecules move faster, increasing the object’s overall thermal energy. Thermal energy is the total kinetic energy due to the random motion of particles in the object. This increase in thermal energy is not the same as an increase in potential energy, which is related to the position of objects in a field, or mechanical energy, which includes both kinetic and potential energy in a macroscopic system. Therefore, when an object’s temperature increases, its thermal energy increases as well, reflecting the higher kinetic energy of its molecules. Thus, the correct option is [D] Thermal energy has increased.
When an object is cooled, the energy of its molecules decreases; option [B]. This reduction in energy means that the thermal energy, which is associated with the random motion of the molecules, is lowered. As a result, the molecules move more slowly. Hence, the speed of the molecules decreases. CoolRead more
When an object is cooled, the energy of its molecules decreases; option [B]. This reduction in energy means that the thermal energy, which is associated with the random motion of the molecules, is lowered. As a result, the molecules move more slowly. Hence, the speed of the molecules decreases. Cooling an object reduces the kinetic energy of its molecules, directly impacting their speed and leading to a slower movement. The mass and weight of the object remain unchanged during this process, as cooling primarily affects the thermal energy and motion of the molecules rather than their mass or weight. Therefore, the correct option is [B] speed decreases. This concept is fundamental in understanding how temperature changes influence the behavior of molecules in various states of matter.
Heat is a type of energy that can be converted into work; option [B]. Count Rumford, also known as Benjamin Thompson, first provided direct evidence of this concept. In the late 18th century, Rumford conducted experiments while overseeing the boring of cannons in Bavaria. He observed that a significRead more
Heat is a type of energy that can be converted into work; option [B]. Count Rumford, also known as Benjamin Thompson, first provided direct evidence of this concept. In the late 18th century, Rumford conducted experiments while overseeing the boring of cannons in Bavaria. He observed that a significant amount of heat was generated during the boring process, even when the drill and cannon were submerged in water to prevent ignition. Rumford concluded that the heat generated was due to the mechanical work being done, thus challenging the then-prevailing caloric theory, which posited that heat was a fluid. His experiments demonstrated that heat could be produced indefinitely as long as mechanical work continued, establishing a fundamental principle in thermodynamics. Therefore, the correct option is [B] Rumford. His work laid the groundwork for the later development of the concept of the mechanical equivalent of heat, which is central to the first law of thermodynamics.
The scientist who first melted two pieces of ice by rubbing them together was Sir Humphry Davy. In 1799, Davy conducted an experiment where he rubbed two pieces of ice together in a vacuum, demonstrating that friction could generate enough heat to melt the ice; option [C]. This experiment provided sRead more
The scientist who first melted two pieces of ice by rubbing them together was Sir Humphry Davy. In 1799, Davy conducted an experiment where he rubbed two pieces of ice together in a vacuum, demonstrating that friction could generate enough heat to melt the ice; option [C]. This experiment provided significant evidence against the caloric theory, which proposed that heat was a fluid contained within substances. Instead, Davy’s experiment supported the idea that heat could be produced by mechanical action, thereby influencing the development of the kinetic theory of heat. Davy’s work helped pave the way for later discoveries in thermodynamics and the understanding of heat as a form of energy. Therefore, the correct option is [C] Davy. His contributions were crucial in shifting the scientific perspective on the nature of heat and energy.
When some water is churned continuously, its temperature increases; option [C]. This process involves the conversion of mechanical energy into thermal energy. The mechanical energy applied to churn the water causes friction and turbulence among the water molecules, increasing their kinetic energy. TRead more
When some water is churned continuously, its temperature increases; option [C]. This process involves the conversion of mechanical energy into thermal energy. The mechanical energy applied to churn the water causes friction and turbulence among the water molecules, increasing their kinetic energy. This increase in kinetic energy manifests as thermal energy, raising the water’s temperature. Therefore, the correct option is [C] Mechanical energy is converted into thermal energy. This phenomenon is consistent with the principle of energy conservation, where one form of energy (mechanical) is transformed into another form (thermal) without the net loss or gain of energy. Understanding these energy transformations is essential in various fields, including thermodynamics, fluid mechanics, and engineering, as it provides insights into the behavior of systems under different energy inputs and outputs. Overall, the conversion of mechanical energy into thermal energy during water churning demonstrates the fundamental relationship between mechanical work and heat transfer.
The temperature of boiling water in a steam engine can become high because there is high pressure inside the boiler; option [C]. Elevated pressure raises the boiling point of water, allowing it to reach higher temperatures before vaporizing into steam. This high-pressure environment is essential forRead more
The temperature of boiling water in a steam engine can become high because there is high pressure inside the boiler; option [C]. Elevated pressure raises the boiling point of water, allowing it to reach higher temperatures before vaporizing into steam. This high-pressure environment is essential for efficient steam engine operation, as it enables the generation of high-pressure steam needed for power production. The increased temperature of the boiling water enhances the efficiency and effectiveness of the steam engine, facilitating the conversion of thermal energy into mechanical work. Therefore, the correct option is [C]. This principle is central to the operation of steam engines, where controlled pressure conditions inside the boiler ensure optimal performance and power output. Understanding the relationship between pressure, temperature, and boiling point is crucial in engineering applications involving steam power generation and utilization, highlighting the importance of maintaining high pressure within the boiler for efficient steam engine operation.
Why are some materials opaque?
Opaque materials are those that do not permit light to pass through them, making them unable to see through. This lack of transparency occurs because their internal structure either scatters or absorbs light rather than letting it travel through. For example, materials like wood, metal, and concreteRead more
Opaque materials are those that do not permit light to pass through them, making them unable to see through. This lack of transparency occurs because their internal structure either scatters or absorbs light rather than letting it travel through. For example, materials like wood, metal, and concrete are opaque because their dense, irregular structures prevent light from passing through. As a result, objects behind opaque materials are not visible.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
https://www.tiwariacademy.com/ncert-solutions-class-6-science-curiosity-chapter-6/
See lessHow are materials used in everyday life?
Materials are integral to everyday life, serving numerous functions in various applications. For instance, cotton and wool are used in clothing for comfort and warmth, while materials like bricks and cement are used in building houses and infrastructure. Metals and plastics are commonly used in tranRead more
Materials are integral to everyday life, serving numerous functions in various applications. For instance, cotton and wool are used in clothing for comfort and warmth, while materials like bricks and cement are used in building houses and infrastructure. Metals and plastics are commonly used in transportation vehicles, packaging, and electronics. The choice of materials affects the performance, durability, and functionality of the items we use daily, making them essential for daily tasks and modern living.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
https://www.tiwariacademy.com/ncert-solutions-class-6-science-curiosity-chapter-6/
See lessWhat is the role of materials in technology?
In technology, materials play a critical role by providing essential properties required for various applications. Semiconductors, such as silicon, are used in electronics to control electrical currents and enable functionality. Metals are used for their strength and durability in components like caRead more
In technology, materials play a critical role by providing essential properties required for various applications. Semiconductors, such as silicon, are used in electronics to control electrical currents and enable functionality. Metals are used for their strength and durability in components like casings and connectors, while polymers are used for their flexibility and insulating properties in wiring and housings. The choice of material affects the performance, efficiency, and reliability of technological devices and systems.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
https://www.tiwariacademy.com/ncert-solutions-class-6-science-curiosity-chapter-6/
See lessWhat are the environmental impacts of using different materials?
The environmental impact of materials depends on their production, use, and disposal. Plastics can contribute to environmental pollution, as they often do not biodegrade and accumulate in landfills and oceans. Metals require extensive mining and processing, which can deplete natural resources and coRead more
The environmental impact of materials depends on their production, use, and disposal. Plastics can contribute to environmental pollution, as they often do not biodegrade and accumulate in landfills and oceans. Metals require extensive mining and processing, which can deplete natural resources and consume significant energy. Sustainable practices, such as recycling, using renewable resources, and reducing waste, aim to mitigate these impacts and promote environmental stewardship in material use and production.
For more CBSE Class 6 Science Curiosity Chapter 6 Materials Around Us Extra Questions & Answer:
https://www.tiwariacademy.com/ncert-solutions-class-6-science-curiosity-chapter-6/
See lessAn increase in the temperature of an object means that
An increase in the temperature of an object means that the thermal energy has increased; option [D]. Temperature is a measure of the average kinetic energy of the molecules within an object. As temperature rises, the molecules move faster, increasing the object's overall thermal energy. Thermal enerRead more
An increase in the temperature of an object means that the thermal energy has increased; option [D]. Temperature is a measure of the average kinetic energy of the molecules within an object. As temperature rises, the molecules move faster, increasing the object’s overall thermal energy. Thermal energy is the total kinetic energy due to the random motion of particles in the object. This increase in thermal energy is not the same as an increase in potential energy, which is related to the position of objects in a field, or mechanical energy, which includes both kinetic and potential energy in a macroscopic system. Therefore, when an object’s temperature increases, its thermal energy increases as well, reflecting the higher kinetic energy of its molecules. Thus, the correct option is [D] Thermal energy has increased.
See lessWhen an object is cooled, the energy of its molecules
When an object is cooled, the energy of its molecules decreases; option [B]. This reduction in energy means that the thermal energy, which is associated with the random motion of the molecules, is lowered. As a result, the molecules move more slowly. Hence, the speed of the molecules decreases. CoolRead more
When an object is cooled, the energy of its molecules decreases; option [B]. This reduction in energy means that the thermal energy, which is associated with the random motion of the molecules, is lowered. As a result, the molecules move more slowly. Hence, the speed of the molecules decreases. Cooling an object reduces the kinetic energy of its molecules, directly impacting their speed and leading to a slower movement. The mass and weight of the object remain unchanged during this process, as cooling primarily affects the thermal energy and motion of the molecules rather than their mass or weight. Therefore, the correct option is [B] speed decreases. This concept is fundamental in understanding how temperature changes influence the behavior of molecules in various states of matter.
See lessHeat is a type of energy that can be converted into work. Who first gave direct evidence of this?
Heat is a type of energy that can be converted into work; option [B]. Count Rumford, also known as Benjamin Thompson, first provided direct evidence of this concept. In the late 18th century, Rumford conducted experiments while overseeing the boring of cannons in Bavaria. He observed that a significRead more
Heat is a type of energy that can be converted into work; option [B]. Count Rumford, also known as Benjamin Thompson, first provided direct evidence of this concept. In the late 18th century, Rumford conducted experiments while overseeing the boring of cannons in Bavaria. He observed that a significant amount of heat was generated during the boring process, even when the drill and cannon were submerged in water to prevent ignition. Rumford concluded that the heat generated was due to the mechanical work being done, thus challenging the then-prevailing caloric theory, which posited that heat was a fluid. His experiments demonstrated that heat could be produced indefinitely as long as mechanical work continued, establishing a fundamental principle in thermodynamics. Therefore, the correct option is [B] Rumford. His work laid the groundwork for the later development of the concept of the mechanical equivalent of heat, which is central to the first law of thermodynamics.
See lessWhich scientist first melted two pieces of ice by rubbing them together?
The scientist who first melted two pieces of ice by rubbing them together was Sir Humphry Davy. In 1799, Davy conducted an experiment where he rubbed two pieces of ice together in a vacuum, demonstrating that friction could generate enough heat to melt the ice; option [C]. This experiment provided sRead more
The scientist who first melted two pieces of ice by rubbing them together was Sir Humphry Davy. In 1799, Davy conducted an experiment where he rubbed two pieces of ice together in a vacuum, demonstrating that friction could generate enough heat to melt the ice; option [C]. This experiment provided significant evidence against the caloric theory, which proposed that heat was a fluid contained within substances. Instead, Davy’s experiment supported the idea that heat could be produced by mechanical action, thereby influencing the development of the kinetic theory of heat. Davy’s work helped pave the way for later discoveries in thermodynamics and the understanding of heat as a form of energy. Therefore, the correct option is [C] Davy. His contributions were crucial in shifting the scientific perspective on the nature of heat and energy.
See lessWhen some water is churned continuously, its temperature increases. In this process
When some water is churned continuously, its temperature increases; option [C]. This process involves the conversion of mechanical energy into thermal energy. The mechanical energy applied to churn the water causes friction and turbulence among the water molecules, increasing their kinetic energy. TRead more
When some water is churned continuously, its temperature increases; option [C]. This process involves the conversion of mechanical energy into thermal energy. The mechanical energy applied to churn the water causes friction and turbulence among the water molecules, increasing their kinetic energy. This increase in kinetic energy manifests as thermal energy, raising the water’s temperature. Therefore, the correct option is [C] Mechanical energy is converted into thermal energy. This phenomenon is consistent with the principle of energy conservation, where one form of energy (mechanical) is transformed into another form (thermal) without the net loss or gain of energy. Understanding these energy transformations is essential in various fields, including thermodynamics, fluid mechanics, and engineering, as it provides insights into the behavior of systems under different energy inputs and outputs. Overall, the conversion of mechanical energy into thermal energy during water churning demonstrates the fundamental relationship between mechanical work and heat transfer.
See lessFor what reason can the temperature of boiling water in a steam engine become high?
The temperature of boiling water in a steam engine can become high because there is high pressure inside the boiler; option [C]. Elevated pressure raises the boiling point of water, allowing it to reach higher temperatures before vaporizing into steam. This high-pressure environment is essential forRead more
The temperature of boiling water in a steam engine can become high because there is high pressure inside the boiler; option [C]. Elevated pressure raises the boiling point of water, allowing it to reach higher temperatures before vaporizing into steam. This high-pressure environment is essential for efficient steam engine operation, as it enables the generation of high-pressure steam needed for power production. The increased temperature of the boiling water enhances the efficiency and effectiveness of the steam engine, facilitating the conversion of thermal energy into mechanical work. Therefore, the correct option is [C]. This principle is central to the operation of steam engines, where controlled pressure conditions inside the boiler ensure optimal performance and power output. Understanding the relationship between pressure, temperature, and boiling point is crucial in engineering applications involving steam power generation and utilization, highlighting the importance of maintaining high pressure within the boiler for efficient steam engine operation.
See less