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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 disc of moment of inertia (9.8/π²) kg m² is rotating at 600 rpm. If the frequency
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A disc of moment of inertia (9.8/π²) kg m² is rotating at 600 rpm. If the frequency
- In which of the processes, does the internal energy of the system remain constant?
- Two wheels having radii in the ratio 1:3 are connected by a common belt
- The electric potential at the surface of an atomic nucleus (z=50) of radius
- A wire of length L metre carrying a current I ampere is bent in the form
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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