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.
The water in the hand pump is hot in winter because water comes out from inside and absorbs heat from the surroundings; option [D]. When water travels through pipes underground, it absorbs heat from the relatively warmer Earth. As a result, when it is pumped out, it feels warmer compared to the coldRead more
The water in the hand pump is hot in winter because water comes out from inside and absorbs heat from the surroundings; option [D]. When water travels through pipes underground, it absorbs heat from the relatively warmer Earth. As a result, when it is pumped out, it feels warmer compared to the colder atmospheric temperature. This phenomenon occurs due to the natural tendency of water to reach thermal equilibrium with its surroundings, where it absorbs heat from the warmer environment.
This process is not influenced by our body’s temperature or the temperature inside the Earth being higher than the atmosphere. Friction generated during pumping might slightly heat the water, but it’s not the primary reason for the water being hot. Instead, the predominant factor is the water’s absorption of heat from the surrounding environment.
Therefore, the correct option is [D]. Water absorbs heat from the surroundings, particularly the warmer Earth, as it travels through underground pipes, resulting in it feeling warmer when pumped out during winter.
The tibia bone is found in the [B] Leg. It is one of the two long bones in the lower leg, situated on the medial side (inner side) of the leg. The tibia extends from the knee joint proximally to the ankle joint distally. Functionally, the tibia plays a crucial role in weight-bearing and locomotion,Read more
The tibia bone is found in the [B] Leg. It is one of the two long bones in the lower leg, situated on the medial side (inner side) of the leg. The tibia extends from the knee joint proximally to the ankle joint distally.
Functionally, the tibia plays a crucial role in weight-bearing and locomotion, serving as a major support structure for the body’s weight during standing, walking, running, and other activities. It also acts as a site for muscle attachment, facilitating movements of the foot and ankle joints.
Together with the fibula, which is the other bone in the lower leg, the tibia provides stability to the ankle joint and helps distribute forces generated during weight-bearing activities. Additionally, the tibia contributes to the formation of the knee joint proximally and the ankle joint distally, playing a vital role in overall lower limb function and mobility.
Leg bone in the human body is [C] solid. The leg bones, including the femur, tibia, and fibula, are composed of dense cortical bone tissue, which is solid and compact. This solid structure provides strength, support, and protection to the lower limbs, allowing them to withstand the forces exerted duRead more
Leg bone in the human body is [C] solid. The leg bones, including the femur, tibia, and fibula, are composed of dense cortical bone tissue, which is solid and compact. This solid structure provides strength, support, and protection to the lower limbs, allowing them to withstand the forces exerted during weight-bearing activities like walking, running, and jumping.
Unlike some bones, such as the long bones of birds, which can be hollow to reduce weight, human leg bones are solid to better withstand the mechanical stresses and strains encountered during locomotion. Additionally, the porous nature of bone tissue, known as trabecular or cancellous bone, is present within the interior of the bone to provide flexibility and absorb shock.
Overall, the solid composition of leg bones ensures their durability and functionality, enabling efficient movement and weight-bearing while minimizing the risk of fractures and injuries.
The humerus bone is found in the [C] Upper arm. It is the long bone that extends from the shoulder joint, connecting to the scapula (shoulder blade), to the elbow joint. The humerus is the largest bone in the upper limb and plays a crucial role in supporting arm movements and providing structural inRead more
The humerus bone is found in the [C] Upper arm. It is the long bone that extends from the shoulder joint, connecting to the scapula (shoulder blade), to the elbow joint. The humerus is the largest bone in the upper limb and plays a crucial role in supporting arm movements and providing structural integrity to the upper arm.
Located between the shoulder and elbow, the humerus serves as an attachment point for muscles and ligaments involved in various arm movements, such as flexion, extension, and rotation. It also houses the brachial artery, which supplies blood to the arm, and the radial and ulnar nerves, which transmit sensory and motor signals to the forearm and hand.
Overall, the humerus bone is essential for the functionality and mobility of the upper limb, allowing for a wide range of movements and providing stability and support to the arm.
The bone that is not a part of the human leg is [B] Humerus. The humerus is located in the upper arm, connecting the shoulder joint with the elbow joint. It is the longest bone of the upper limb and is essential for arm movement and support. On the other hand, the tibia, fibula, and femur are all boRead more
The bone that is not a part of the human leg is [B] Humerus. The humerus is located in the upper arm, connecting the shoulder joint with the elbow joint. It is the longest bone of the upper limb and is essential for arm movement and support.
On the other hand, the tibia, fibula, and femur are all bones of the human leg. The femur is the thigh bone, the longest bone in the body, extending from the hip to the knee. The tibia, also known as the shinbone, is the larger of the two bones in the lower leg and is located on the inner side. The fibula, or calf bone, is thinner and located on the outer side of the lower leg. Together, the tibia and fibula provide structural support and stability to the lower leg and ankle joint.
When 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 lessThe water in the hand pump is hot in winter because
The water in the hand pump is hot in winter because water comes out from inside and absorbs heat from the surroundings; option [D]. When water travels through pipes underground, it absorbs heat from the relatively warmer Earth. As a result, when it is pumped out, it feels warmer compared to the coldRead more
The water in the hand pump is hot in winter because water comes out from inside and absorbs heat from the surroundings; option [D]. When water travels through pipes underground, it absorbs heat from the relatively warmer Earth. As a result, when it is pumped out, it feels warmer compared to the colder atmospheric temperature. This phenomenon occurs due to the natural tendency of water to reach thermal equilibrium with its surroundings, where it absorbs heat from the warmer environment.
See lessThis process is not influenced by our body’s temperature or the temperature inside the Earth being higher than the atmosphere. Friction generated during pumping might slightly heat the water, but it’s not the primary reason for the water being hot. Instead, the predominant factor is the water’s absorption of heat from the surrounding environment.
Therefore, the correct option is [D]. Water absorbs heat from the surroundings, particularly the warmer Earth, as it travels through underground pipes, resulting in it feeling warmer when pumped out during winter.
Where is the tibia bone found?
The tibia bone is found in the [B] Leg. It is one of the two long bones in the lower leg, situated on the medial side (inner side) of the leg. The tibia extends from the knee joint proximally to the ankle joint distally. Functionally, the tibia plays a crucial role in weight-bearing and locomotion,Read more
The tibia bone is found in the [B] Leg. It is one of the two long bones in the lower leg, situated on the medial side (inner side) of the leg. The tibia extends from the knee joint proximally to the ankle joint distally.
See lessFunctionally, the tibia plays a crucial role in weight-bearing and locomotion, serving as a major support structure for the body’s weight during standing, walking, running, and other activities. It also acts as a site for muscle attachment, facilitating movements of the foot and ankle joints.
Together with the fibula, which is the other bone in the lower leg, the tibia provides stability to the ankle joint and helps distribute forces generated during weight-bearing activities. Additionally, the tibia contributes to the formation of the knee joint proximally and the ankle joint distally, playing a vital role in overall lower limb function and mobility.
Leg bone in human body is
Leg bone in the human body is [C] solid. The leg bones, including the femur, tibia, and fibula, are composed of dense cortical bone tissue, which is solid and compact. This solid structure provides strength, support, and protection to the lower limbs, allowing them to withstand the forces exerted duRead more
Leg bone in the human body is [C] solid. The leg bones, including the femur, tibia, and fibula, are composed of dense cortical bone tissue, which is solid and compact. This solid structure provides strength, support, and protection to the lower limbs, allowing them to withstand the forces exerted during weight-bearing activities like walking, running, and jumping.
Unlike some bones, such as the long bones of birds, which can be hollow to reduce weight, human leg bones are solid to better withstand the mechanical stresses and strains encountered during locomotion. Additionally, the porous nature of bone tissue, known as trabecular or cancellous bone, is present within the interior of the bone to provide flexibility and absorb shock.
See lessOverall, the solid composition of leg bones ensures their durability and functionality, enabling efficient movement and weight-bearing while minimizing the risk of fractures and injuries.
Where is the humerus bone found?
The humerus bone is found in the [C] Upper arm. It is the long bone that extends from the shoulder joint, connecting to the scapula (shoulder blade), to the elbow joint. The humerus is the largest bone in the upper limb and plays a crucial role in supporting arm movements and providing structural inRead more
The humerus bone is found in the [C] Upper arm. It is the long bone that extends from the shoulder joint, connecting to the scapula (shoulder blade), to the elbow joint. The humerus is the largest bone in the upper limb and plays a crucial role in supporting arm movements and providing structural integrity to the upper arm.
Located between the shoulder and elbow, the humerus serves as an attachment point for muscles and ligaments involved in various arm movements, such as flexion, extension, and rotation. It also houses the brachial artery, which supplies blood to the arm, and the radial and ulnar nerves, which transmit sensory and motor signals to the forearm and hand.
Overall, the humerus bone is essential for the functionality and mobility of the upper limb, allowing for a wide range of movements and providing stability and support to the arm.
See lessWhich of the following is not a bone of the human leg?
The bone that is not a part of the human leg is [B] Humerus. The humerus is located in the upper arm, connecting the shoulder joint with the elbow joint. It is the longest bone of the upper limb and is essential for arm movement and support. On the other hand, the tibia, fibula, and femur are all boRead more
The bone that is not a part of the human leg is [B] Humerus. The humerus is located in the upper arm, connecting the shoulder joint with the elbow joint. It is the longest bone of the upper limb and is essential for arm movement and support.
See lessOn the other hand, the tibia, fibula, and femur are all bones of the human leg. The femur is the thigh bone, the longest bone in the body, extending from the hip to the knee. The tibia, also known as the shinbone, is the larger of the two bones in the lower leg and is located on the inner side. The fibula, or calf bone, is thinner and located on the outer side of the lower leg. Together, the tibia and fibula provide structural support and stability to the lower leg and ankle joint.