The unit of viscosity is Poise; option [A]. Viscosity is a measure of a fluid's resistance to flow, describing its internal friction. It is defined as the ratio of shear stress to shear rate within the fluid. The Poise is the standard unit used to quantify viscosity. It is named after French physiolRead more
The unit of viscosity is Poise; option [A]. Viscosity is a measure of a fluid’s resistance to flow, describing its internal friction. It is defined as the ratio of shear stress to shear rate within the fluid. The Poise is the standard unit used to quantify viscosity. It is named after French physiologist Jean Léonard Marie Poiseuille, who made significant contributions to the understanding of fluid dynamics and the study of viscosity. The Pascal, on the other hand, is a unit of pressure, while Poiseuille is a unit used to measure flow rate in fluid dynamics, particularly in the context of laminar flow through cylindrical tubes, named after Jean Léonard Marie Poiseuille. Therefore, the correct unit for viscosity is Poise, denoted by the symbol “P”.
If the diameter of the capillary is doubled, the height of the water surface rising in it remains the same; option [C]. This is governed by the capillary action phenomenon described by the Jurin's Law. According to this law, the height to which a liquid rises in a capillary tube is inversely proportRead more
If the diameter of the capillary is doubled, the height of the water surface rising in it remains the same; option [C]. This is governed by the capillary action phenomenon described by the Jurin’s Law. According to this law, the height to which a liquid rises in a capillary tube is inversely proportional to the diameter of the tube. Therefore, doubling the diameter would result in halving the height, and vice versa. However, if the diameter is doubled, the effect cancels out, and the height remains unchanged. This principle is essential in various fields such as fluid mechanics, biology, and materials science, where capillary action plays a crucial role in phenomena like plant water uptake, ink absorption in paper, and the functioning of microfluidic devices. Understanding this relationship between capillary diameter and height helps in designing and optimizing systems utilizing capillary action for various applications.
Astronauts cannot stand straight in space because there is no gravity; option [A]. In the microgravity environment of space, there is no significant gravitational force pulling them towards any particular direction. As a result, they experience weightlessness and float freely, unable to stand in theRead more
Astronauts cannot stand straight in space because there is no gravity; option [A]. In the microgravity environment of space, there is no significant gravitational force pulling them towards any particular direction. As a result, they experience weightlessness and float freely, unable to stand in the traditional sense. Instead, they rely on restraints and handholds to stabilize themselves and move around in spacecraft or space stations. While other forces, such as the solar wind or atmospheric pressure, may affect space missions in various ways, they do not directly influence the ability of astronauts to stand straight in space. It is the absence of gravity that fundamentally alters the behavior of objects and individuals in the space environment, requiring astronauts to adapt and use specialized equipment for mobility and stability.
Ventilators are installed near the ceiling of the room primarily because the exhaled hot air rises up and goes out; option [A]. Hot air is less dense than cold air, causing it to ascend towards the ceiling. By placing ventilators near the ceiling, they effectively expel this hot air, promoting betteRead more
Ventilators are installed near the ceiling of the room primarily because the exhaled hot air rises up and goes out; option [A]. Hot air is less dense than cold air, causing it to ascend towards the ceiling. By placing ventilators near the ceiling, they effectively expel this hot air, promoting better air circulation and ventilation within the room.
Additionally, installing ventilators near the ceiling helps to provide cross ventilation in the room. Cross ventilation involves the flow of air through opposing openings, such as windows or ventilators, allowing fresh air to enter while stale air exits. Placing ventilators strategically near the ceiling enables them to work in conjunction with other openings in the room, facilitating the exchange of air and maintaining indoor air quality.
Moreover, ventilators near the ceiling do not necessarily provide light to the room. Their primary function is ventilation, not illumination. Lighting fixtures or windows are typically used to provide illumination in a room, while ventilators focus on improving air quality and comfort.
As for aesthetics, the placement of ventilators near the ceiling is more practical than decorative. While aesthetics may play a role in design considerations, the primary reason for installing ventilators near the ceiling is to optimize air circulation and ventilation within the room.
When soap is dissolved in water, the surface tension initially decreases; option [A]. Soap molecules contain hydrophilic heads and hydrophobic tails. The hydrophobic tails disrupt the cohesive forces between water molecules at the surface, reducing surface tension. This decrease facilitates the spreRead more
When soap is dissolved in water, the surface tension initially decreases; option [A]. Soap molecules contain hydrophilic heads and hydrophobic tails. The hydrophobic tails disrupt the cohesive forces between water molecules at the surface, reducing surface tension. This decrease facilitates the spreading of water and enhances its ability to wet surfaces, enabling effective cleaning.
However, at higher concentrations of soap, the excess molecules can aggregate to form structures called micelles. In these micelles, the hydrophobic tails are shielded from the water, leading to a slight increase in surface tension compared to the initial decrease. This increase occurs because the micelles effectively reduce the number of free soap molecules available to disrupt the water’s surface tension directly.
Therefore, the behavior of surface tension when soap is dissolved in water can be described as initially decreasing due to the disruptive action of individual soap molecules, followed by a potential slight increase as micelles form at higher concentrations. Overall, the presence of soap alters the surface tension of water, impacting its properties and enhancing its effectiveness in cleaning applications.
The unit of viscosity is
The unit of viscosity is Poise; option [A]. Viscosity is a measure of a fluid's resistance to flow, describing its internal friction. It is defined as the ratio of shear stress to shear rate within the fluid. The Poise is the standard unit used to quantify viscosity. It is named after French physiolRead more
The unit of viscosity is Poise; option [A]. Viscosity is a measure of a fluid’s resistance to flow, describing its internal friction. It is defined as the ratio of shear stress to shear rate within the fluid. The Poise is the standard unit used to quantify viscosity. It is named after French physiologist Jean Léonard Marie Poiseuille, who made significant contributions to the understanding of fluid dynamics and the study of viscosity. The Pascal, on the other hand, is a unit of pressure, while Poiseuille is a unit used to measure flow rate in fluid dynamics, particularly in the context of laminar flow through cylindrical tubes, named after Jean Léonard Marie Poiseuille. Therefore, the correct unit for viscosity is Poise, denoted by the symbol “P”.
See lessIf the diameter of the capillary is doubled then the height of the water surface rising in it
If the diameter of the capillary is doubled, the height of the water surface rising in it remains the same; option [C]. This is governed by the capillary action phenomenon described by the Jurin's Law. According to this law, the height to which a liquid rises in a capillary tube is inversely proportRead more
If the diameter of the capillary is doubled, the height of the water surface rising in it remains the same; option [C]. This is governed by the capillary action phenomenon described by the Jurin’s Law. According to this law, the height to which a liquid rises in a capillary tube is inversely proportional to the diameter of the tube. Therefore, doubling the diameter would result in halving the height, and vice versa. However, if the diameter is doubled, the effect cancels out, and the height remains unchanged. This principle is essential in various fields such as fluid mechanics, biology, and materials science, where capillary action plays a crucial role in phenomena like plant water uptake, ink absorption in paper, and the functioning of microfluidic devices. Understanding this relationship between capillary diameter and height helps in designing and optimizing systems utilizing capillary action for various applications.
See lessAstronauts cannot stand straight in space because
Astronauts cannot stand straight in space because there is no gravity; option [A]. In the microgravity environment of space, there is no significant gravitational force pulling them towards any particular direction. As a result, they experience weightlessness and float freely, unable to stand in theRead more
Astronauts cannot stand straight in space because there is no gravity; option [A]. In the microgravity environment of space, there is no significant gravitational force pulling them towards any particular direction. As a result, they experience weightlessness and float freely, unable to stand in the traditional sense. Instead, they rely on restraints and handholds to stabilize themselves and move around in spacecraft or space stations. While other forces, such as the solar wind or atmospheric pressure, may affect space missions in various ways, they do not directly influence the ability of astronauts to stand straight in space. It is the absence of gravity that fundamentally alters the behavior of objects and individuals in the space environment, requiring astronauts to adapt and use specialized equipment for mobility and stability.
See lessVentilators are installed near the ceiling of the room, because
Ventilators are installed near the ceiling of the room primarily because the exhaled hot air rises up and goes out; option [A]. Hot air is less dense than cold air, causing it to ascend towards the ceiling. By placing ventilators near the ceiling, they effectively expel this hot air, promoting betteRead more
Ventilators are installed near the ceiling of the room primarily because the exhaled hot air rises up and goes out; option [A]. Hot air is less dense than cold air, causing it to ascend towards the ceiling. By placing ventilators near the ceiling, they effectively expel this hot air, promoting better air circulation and ventilation within the room.
Additionally, installing ventilators near the ceiling helps to provide cross ventilation in the room. Cross ventilation involves the flow of air through opposing openings, such as windows or ventilators, allowing fresh air to enter while stale air exits. Placing ventilators strategically near the ceiling enables them to work in conjunction with other openings in the room, facilitating the exchange of air and maintaining indoor air quality.
Moreover, ventilators near the ceiling do not necessarily provide light to the room. Their primary function is ventilation, not illumination. Lighting fixtures or windows are typically used to provide illumination in a room, while ventilators focus on improving air quality and comfort.
As for aesthetics, the placement of ventilators near the ceiling is more practical than decorative. While aesthetics may play a role in design considerations, the primary reason for installing ventilators near the ceiling is to optimize air circulation and ventilation within the room.
See lessWhen soap is dissolved in water, the surface tension
When soap is dissolved in water, the surface tension initially decreases; option [A]. Soap molecules contain hydrophilic heads and hydrophobic tails. The hydrophobic tails disrupt the cohesive forces between water molecules at the surface, reducing surface tension. This decrease facilitates the spreRead more
When soap is dissolved in water, the surface tension initially decreases; option [A]. Soap molecules contain hydrophilic heads and hydrophobic tails. The hydrophobic tails disrupt the cohesive forces between water molecules at the surface, reducing surface tension. This decrease facilitates the spreading of water and enhances its ability to wet surfaces, enabling effective cleaning.
However, at higher concentrations of soap, the excess molecules can aggregate to form structures called micelles. In these micelles, the hydrophobic tails are shielded from the water, leading to a slight increase in surface tension compared to the initial decrease. This increase occurs because the micelles effectively reduce the number of free soap molecules available to disrupt the water’s surface tension directly.
Therefore, the behavior of surface tension when soap is dissolved in water can be described as initially decreasing due to the disruptive action of individual soap molecules, followed by a potential slight increase as micelles form at higher concentrations. Overall, the presence of soap alters the surface tension of water, impacting its properties and enhancing its effectiveness in cleaning applications.
See less