| ⇦ | 
| ⇨ |
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: - An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
- A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle
- When the length of the vibrating segment of a sonometer wire is increased by
- If the volume of a block of aluminium is decreased by 1%, the pressure
- A metal wire of circular cross-section has a resistance R₁. The wire is now stretched
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
- A bullet is shot from a riffle. As a result the rifle recoils.The kinetic energy of riffle
- When the length of the vibrating segment of a sonometer wire is increased by
- If the volume of a block of aluminium is decreased by 1%, the pressure
- A metal wire of circular cross-section has a resistance R₁. The wire is now stretched
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply