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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
- If angular momentum of a body is increased by 200% its kinetic energy will increase
- If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
- A particle of masses m is thrown upwards from the surface of the earth, with a velocity u
- The electric potential at a point (x,y,z) is given by V = – x²y – xz³ + 4.
- The magnetic susceptibility does not depend upon the temperature in
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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