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Physics CBSE Live product
Class 7 (2025-26)
Light: Shadows and reflections
Revision I - Light: Shadows and reflections
8.
Early and modern artificial lights
Question:
3
m.
Select the best option regarding artificial lights:
1
.
Fire
-
Fire is a modern electric source of light used only in lamps and bulbs
Fire was the earliest artificial light created by humans and was mainly used for light and warmth
Fire produces light only when electricity is supplied to it
Fire cannot be controlled and was never used intentionally for lighting
2
.
Oil-lamp
-
An oil lamp uses oil as fuel and produces light by burning it
An oil lamp produces light without using any fuel
An oil lamp is a modern invention used mainly with LED lights
An oil lamp works only when connected to an electric supply
3
.
LED
-
LED bulbs are an early form of artificial lighting used in ancient times
LED bulbs are modern electric lights that consume less energy
LED bulbs produce light only when fire is present
LED bulbs work by burning oil and wax inside them
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