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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%
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The Rutherford scattering experiment proves that an atom consists of
- A pan is suspended from a steel wire. Weights are slowly put on the pan
- The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element Y
- When a radioactive substance emits an ∝ particle, its position in the periodic table
- An aicraft executes a horizontal loop of radius 1 km with a speed of 900 kmh⁻¹
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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