Blackening of the vessel's bottom is a sign of incomplete combustion. This happens when there isn't enough oxygen for the fuel to burn fully, or when the temperature is too low for complete oxidation. Soot, a byproduct of incomplete combustion, is what causes the blackening.
While cooking, the bottom of the vessel is getting blackened on the outside, it means that :
Asked in Executive Officer and Tax & Revenue Inspector Exam 2023 · Topic: Heat and Thermodynamics (Blackbody Radiation and Laws (Stefan-Boltzmann, Wien's Displacement))
Show answer
Answer: B. The fuel is not burning completely.
More Physics questions
- Consider the following statements : Assertion (A) : Light coloured clothes are preferred in summer. Reason (R) : Light colours are poor absorbers of heat. Select correct answer from the code given below :
- A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the- - temperature of the object - temperature of the surroundings - temperature difference between the object and its surroundings - average temperature of the object and its surroundings
- After a hot sunny day, people sprinkle water on the roof-top because :
- A piece of ice, 100 g in mass is kept at 0 °C. The amount of heat it requires to melt at 0 °C is (take latent heat of melting of ice to be 333.6 J/ g):
- Which of the following represents a relation for 'heat lost = heat gained'?
- An ice bullet of temperature – 10°C is fired upon an object. The bullet spends 20% of its kinetic energy in penetrating into the object and remaining kinetic energy is spent into melting the bullet at 0°C. The latent heat of fusion of ice is 3·4 × 10⁵ J kg⁻¹ and its specific heat capacity is 2000 J kg⁻¹ K⁻¹. Which one among the following is the correct initial speed of the bullet ?
- 100 grams of ice at 0°C is put in 240 grams of water at 5°C. The mixture finally comes to equilibrium at 0°C with m grams of ice melted in the process. Value of m is close to : (latent heat of ice = 3.33 × 105 J/kg and specific heat of water = 4.2 J g-1°C)
- There are two statements given below : Statement I : Steam produces less severe burns than water at the same temperature. Statement II : Dry ice is colder than regular ice. In the light of these two statements, choose the most appropriate answer from the options given below :