Optics Question 14
Question: Assertion : The fluorescent tube is considered better than an electric bulb. Reason : Efficiency of fluorescent tube is more than the efficiency of electric bulb.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: A
Solution:
The efficiency of fluorescent tube is about 50 lumen/watt, whereas efficiency of electric bulb is about 12 lumen/watt.
Thus for same amount of electric energy consumed, the tube gives nearly 4 times more light than the filament bulb.
