Which of the following diagrams shows a non-luminous flame?

I only

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II only

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I and II

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II and IV

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Solution

The correct option is A I only
A blue colored flame which produces very little light is called non-luminous flame. In other words when a fuel undergoes complete combustion it is non luminous flame.

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Similar questions

Which of the following are non-luminous objects?

A. Orion

B. Morning star

C. Moon

D. Pole star

(a) A and B

(b) B and C

(d) Only C

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