OPSC 2017 Solved Paper

Question : 94 of 100

Marks: +1, -0

The approximate life time of a common electric bulb is

1000 {hrs}

whereas the approximate life time of a LED bulb is

$5000 {hrs}$
$10000 {hrs}$
$20000 {hrs}$
$50000 {hrs}$

Validate

Solution:

According to EESL, an incandescent bulb requires 60 watts of power to emit 350-400 lumen of light (unit of light) while CFLs with its hazardous mercury coat emit 450-550 lumen of light on 14-16 watts. In sharp contrast, LEDs cast 600-700 lumen, consuming just 6 watts of power and saving

90 \%

more energy than regular bulbs. LED bulbs also have a life of

15,000-20,000

hours.

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