Q1: Hot working of lead is carried out at

ANS:B - 373°K

The temperature 373 Kelvin (373 K) is equivalent to 100 degrees Celsius (100°C) on the Celsius scale. Explanation:

1. Kelvin Scale: The Kelvin scale is an absolute temperature scale commonly used in scientific measurements. In the Kelvin scale, 0 K represents absolute zero, the lowest possible temperature where particles have minimal thermal motion.
2. Conversion: To convert temperatures from Celsius to Kelvin, you simply add 273.15 to the Celsius temperature. For example, to convert 100°C to Kelvin, you add 273.15: Temperature in Kelvin=Temperature in Celsius+273.15Temperature in Kelvin=Temperature in Celsius+273.15 373 K=100 °C+273.15373K=100°C+273.15
3. Importance: Kelvin scale is often used in scientific calculations and measurements, especially in fields such as physics, chemistry, and engineering, where absolute temperature values are necessary. It is particularly useful when dealing with gas laws, thermodynamics, and other areas where precise temperature measurements are required.
4. Absolute Zero: As mentioned earlier, absolute zero (0 K) is the lowest possible temperature, where all thermal motion ceases. It is the point at which the volume of an ideal gas would theoretically be zero. While absolute zero is a theoretical concept, temperatures close to absolute zero have been achieved in laboratory settings using techniques such as laser cooling and magnetic cooling.