To measure extremely high temperatures, such as 2000 °C, a total radiation pyrometer is the appropriate instrument. Total radiation pyrometers function by detecting the thermal radiation emitted by an object and converting this radiation into a temperature reading. This method is particularly effectRead more
To measure extremely high temperatures, such as 2000 °C, a total radiation pyrometer is the appropriate instrument. Total radiation pyrometers function by detecting the thermal radiation emitted by an object and converting this radiation into a temperature reading. This method is particularly effective for high-temperature measurements where direct contact methods, such as mercury or gas thermometers, are impractical or unsafe.
Mercury thermometers and gas thermometers are typically limited to much lower temperature ranges and would not withstand the extreme heat of 2000 °C. Vapor pressure thermometers also cannot measure such high temperatures, as they rely on the vapor pressure of a liquid, which would not be stable at these levels. Total radiation pyrometers, however, are designed specifically for such conditions, making them ideal for industrial applications involving furnaces, kilns, and other high-temperature environments. Therefore, the correct answer is [C] Total radiation pyrometer.
The incorrect statement among the given options is [B] Both air conditioner and air cooler control humidity. Air conditioners are designed to control both the temperature and humidity levels in a room. They work by removing heat and moisture from the air, thus lowering both the temperature and humidRead more
The incorrect statement among the given options is [B] Both air conditioner and air cooler control humidity. Air conditioners are designed to control both the temperature and humidity levels in a room. They work by removing heat and moisture from the air, thus lowering both the temperature and humidity. On the other hand, air coolers operate using the principle of evaporative cooling, which involves blowing air through water-soaked pads. This process adds moisture to the air, thereby not controlling but actually increasing humidity.
While air conditioners effectively manage and reduce humidity, air coolers can make the air more humid, especially in already humid environments. Therefore, the statement that both air conditioners and air coolers control humidity is incorrect. Thus, [B] is the incorrect statement, as air coolers do not have the capability to control or reduce humidity levels effectively.
A white and smooth surface is characterized by its ability to reflect most of the incoming light and heat, making it a poor absorber of heat. The color white reflects the majority of the light spectrum, including visible light and heat (infrared radiation), which significantly reduces the amount ofRead more
A white and smooth surface is characterized by its ability to reflect most of the incoming light and heat, making it a poor absorber of heat. The color white reflects the majority of the light spectrum, including visible light and heat (infrared radiation), which significantly reduces the amount of heat energy absorbed by the surface. Additionally, a smooth surface enhances this reflective property by minimizing surface irregularities that could otherwise absorb more heat.
This reflective quality helps in keeping the surface cooler and is the reason why white surfaces are often used in hot climates to reduce heat absorption. For example, white-painted buildings and roofs help in reflecting sunlight, thereby lowering indoor temperatures. Thus, the correct answer is [C] Poor absorber of heat and good reflector, as these properties are typical of white and smooth surfaces.
The outer part of the bottom of cooking utensils is typically left black because black surfaces are known to be excellent absorbers of heat. Black color absorbs a wider spectrum of light and heat energy compared to lighter colors. This characteristic enhances the efficiency of heat transfer from theRead more
The outer part of the bottom of cooking utensils is typically left black because black surfaces are known to be excellent absorbers of heat. Black color absorbs a wider spectrum of light and heat energy compared to lighter colors. This characteristic enhances the efficiency of heat transfer from the stove to the utensil, ensuring that the cooking process is faster and more uniform.
The increased heat absorption helps in maintaining a consistent cooking temperature, which is essential for proper cooking. This is particularly beneficial in ensuring that the heat is distributed evenly across the bottom surface of the utensil, reducing cooking times and improving energy efficiency.
While cleanliness and conductivity are important factors, the primary reason for the blackened bottoms is to maximize heat absorption. Therefore, the correct answer is [D] Black surface is a good absorber of heat.
Wearing white clothes during summer is more comfortable because white fabrics reflect the majority of the sunlight, including visible, infrared, and ultraviolet light. This reflection significantly reduces the amount of heat absorbed by the clothing compared to darker colors, which tend to absorb moRead more
Wearing white clothes during summer is more comfortable because white fabrics reflect the majority of the sunlight, including visible, infrared, and ultraviolet light. This reflection significantly reduces the amount of heat absorbed by the clothing compared to darker colors, which tend to absorb more sunlight and thus more heat. By reflecting sunlight, white clothes help to keep the body cooler, making them more comfortable to wear in hot weather.
Additionally, lighter colors, like white, contribute to better heat dissipation from the body, allowing for a cooler and more comfortable experience. Although white clothes do not inherently provide coolness to the eyes or directly absorb sweat better than other colors, their ability to reflect sunlight and reduce heat absorption is the primary reason they are preferred in the summer. Therefore, the correct answer is [B] They dissipate all the heat transferred from the body.
A thermometer suitable for measuring 2000 °C is
To measure extremely high temperatures, such as 2000 °C, a total radiation pyrometer is the appropriate instrument. Total radiation pyrometers function by detecting the thermal radiation emitted by an object and converting this radiation into a temperature reading. This method is particularly effectRead more
To measure extremely high temperatures, such as 2000 °C, a total radiation pyrometer is the appropriate instrument. Total radiation pyrometers function by detecting the thermal radiation emitted by an object and converting this radiation into a temperature reading. This method is particularly effective for high-temperature measurements where direct contact methods, such as mercury or gas thermometers, are impractical or unsafe.
Mercury thermometers and gas thermometers are typically limited to much lower temperature ranges and would not withstand the extreme heat of 2000 °C. Vapor pressure thermometers also cannot measure such high temperatures, as they rely on the vapor pressure of a liquid, which would not be stable at these levels. Total radiation pyrometers, however, are designed specifically for such conditions, making them ideal for industrial applications involving furnaces, kilns, and other high-temperature environments. Therefore, the correct answer is [C] Total radiation pyrometer.
See lessWhich of the following statements is Not correct?
The incorrect statement among the given options is [B] Both air conditioner and air cooler control humidity. Air conditioners are designed to control both the temperature and humidity levels in a room. They work by removing heat and moisture from the air, thus lowering both the temperature and humidRead more
The incorrect statement among the given options is [B] Both air conditioner and air cooler control humidity. Air conditioners are designed to control both the temperature and humidity levels in a room. They work by removing heat and moisture from the air, thus lowering both the temperature and humidity. On the other hand, air coolers operate using the principle of evaporative cooling, which involves blowing air through water-soaked pads. This process adds moisture to the air, thereby not controlling but actually increasing humidity.
While air conditioners effectively manage and reduce humidity, air coolers can make the air more humid, especially in already humid environments. Therefore, the statement that both air conditioners and air coolers control humidity is incorrect. Thus, [B] is the incorrect statement, as air coolers do not have the capability to control or reduce humidity levels effectively.
See lessWhat is a white and smooth surface like?
A white and smooth surface is characterized by its ability to reflect most of the incoming light and heat, making it a poor absorber of heat. The color white reflects the majority of the light spectrum, including visible light and heat (infrared radiation), which significantly reduces the amount ofRead more
A white and smooth surface is characterized by its ability to reflect most of the incoming light and heat, making it a poor absorber of heat. The color white reflects the majority of the light spectrum, including visible light and heat (infrared radiation), which significantly reduces the amount of heat energy absorbed by the surface. Additionally, a smooth surface enhances this reflective property by minimizing surface irregularities that could otherwise absorb more heat.
This reflective quality helps in keeping the surface cooler and is the reason why white surfaces are often used in hot climates to reduce heat absorption. For example, white-painted buildings and roofs help in reflecting sunlight, thereby lowering indoor temperatures. Thus, the correct answer is [C] Poor absorber of heat and good reflector, as these properties are typical of white and smooth surfaces.
See lessWhy is the outer part of the bottom of cooking utensils left black?
The outer part of the bottom of cooking utensils is typically left black because black surfaces are known to be excellent absorbers of heat. Black color absorbs a wider spectrum of light and heat energy compared to lighter colors. This characteristic enhances the efficiency of heat transfer from theRead more
The outer part of the bottom of cooking utensils is typically left black because black surfaces are known to be excellent absorbers of heat. Black color absorbs a wider spectrum of light and heat energy compared to lighter colors. This characteristic enhances the efficiency of heat transfer from the stove to the utensil, ensuring that the cooking process is faster and more uniform.
The increased heat absorption helps in maintaining a consistent cooking temperature, which is essential for proper cooking. This is particularly beneficial in ensuring that the heat is distributed evenly across the bottom surface of the utensil, reducing cooking times and improving energy efficiency.
While cleanliness and conductivity are important factors, the primary reason for the blackened bottoms is to maximize heat absorption. Therefore, the correct answer is [D] Black surface is a good absorber of heat.
See lessWearing white clothes in summer is comfortable because
Wearing white clothes during summer is more comfortable because white fabrics reflect the majority of the sunlight, including visible, infrared, and ultraviolet light. This reflection significantly reduces the amount of heat absorbed by the clothing compared to darker colors, which tend to absorb moRead more
Wearing white clothes during summer is more comfortable because white fabrics reflect the majority of the sunlight, including visible, infrared, and ultraviolet light. This reflection significantly reduces the amount of heat absorbed by the clothing compared to darker colors, which tend to absorb more sunlight and thus more heat. By reflecting sunlight, white clothes help to keep the body cooler, making them more comfortable to wear in hot weather.
Additionally, lighter colors, like white, contribute to better heat dissipation from the body, allowing for a cooler and more comfortable experience. Although white clothes do not inherently provide coolness to the eyes or directly absorb sweat better than other colors, their ability to reflect sunlight and reduce heat absorption is the primary reason they are preferred in the summer. Therefore, the correct answer is [B] They dissipate all the heat transferred from the body.
See less