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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: - When a mass M is attached to the spring of force constant k,
- If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When a mass M is attached to the spring of force constant k,
- If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
- Zener diode is used
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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