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If voltage across a bulb rated 220 volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is:
Options
(a) 20%
(b) 2.50%
(c) 5%
(d) 10%
Correct Answer:
5%
Explanation:
Resistance of bulb is constant
P = V² / R
∆p / p = 2∆V / V + ∆R / R
∆p / P = 2 x 2.5 + 0 = 5%
Related Questions: - A body is moving in a vertical circle. The string must remain taut at the highest point
- Which of the following phenomenon exhibited the particle nature of light?
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body is moving in a vertical circle. The string must remain taut at the highest point
- Which of the following phenomenon exhibited the particle nature of light?
- A body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature
- When a mass m is attached to a spring, it normally extends by 0.2 m.
- The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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