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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: - An air bubble in a glass slab with refractive index 1.5 (near normal incidence)
- A particle of mass ‘m’ is kept at rest at a height 3R from the surface of earth
- Find the fundamental frequency of a closed pipe if the length of air column is 42m.
- Equal currents are passing through two very long and straight parallel wires
- A projectile is fired from the surface of the earth with a velocity of 5 m s⁻¹ and angle
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An air bubble in a glass slab with refractive index 1.5 (near normal incidence)
- A particle of mass ‘m’ is kept at rest at a height 3R from the surface of earth
- Find the fundamental frequency of a closed pipe if the length of air column is 42m.
- Equal currents are passing through two very long and straight parallel wires
- A projectile is fired from the surface of the earth with a velocity of 5 m s⁻¹ and angle
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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