Question

(x) Out of these, which one is not a man-made luminous body?
(a) Electric bulb
(b) Burning candle
(c) Firefly (Jugnu)
(d) Oil lamp

Answer 1

Answer:

Fire fly is not a man - made luminous body

Answer 2

Out of these, the one that is not a man-made luminous body is Firefly. (option: c)

• The electric bulb is invented by Thomas Edison, it works when tungsten heats up and current flows inside it.
• A burning candle is a natural light source. It is made up of a chain of carbon atoms surrounded by hydrogen atoms. It is also a man-made invention.
• Firefly is an insect that has its own luminous source.
• An oil lamp is made by humans to save themselves from darkness until the electric bulb was not discovered.

Hence, the firefly is the non-man-made source of light.