Madhya Pradesh Police Exam Model Paper 5

The correct answer is Yellow.

• A luminous flame appears to be yellow in colour.
• A region of burning gases is called flame.
• There are three different zones of a flame:
  1. Dark zone.
  2. Luminous zone.
  3. Non-luminous zone
• When the oxygen supply is insufficient, the fuel burns partially by producing a yellow flame, it is said to be a luminous flame.
• When kerosene burned in a lamp, it produces a luminous flame.
• When the oxygen supply is sufficient, the fuel burns completely by producing a blue flame, it is said to be a non-luminous flame.
• In an LPG stove, the LPG burns with non-luminous
• A non-luminous zone is the hottest zone of a candle flame.