Which among the following is most energy efficient?
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Incandescent bulb
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Fluorescent tube light
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Compact fluorescent lamp
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non of the above
C
Correct answer
Explanation
Compact fluorescent lamps (CFLs) are significantly more energy efficient than incandescent bulbs, converting more electrical energy into visible light rather than heat. They typically use 60-80% less energy than incandescent bulbs while producing the same luminous output. Fluorescent tube lights are more efficient than incandescent but less efficient than CFLs due to their larger ballast requirements.