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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: - Two charged spheres seperated at a distance d exert a force F on each other.
- The ratio of the dimensions of planck’s constant and that of the moment of inertia is
- A slab consists of two parallel layers of two different materials of same thickness
- A body of mass m is thrown upwards at an angle θ with the horizontal with velocity
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two charged spheres seperated at a distance d exert a force F on each other.
- The ratio of the dimensions of planck’s constant and that of the moment of inertia is
- A slab consists of two parallel layers of two different materials of same thickness
- A body of mass m is thrown upwards at an angle θ with the horizontal with velocity
- The speed of light in media M₁ and M₂ are 1.5×10⁸ ms⁻¹ and 2×10⁸ ms⁻¹ respectively.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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