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A 220 volt and 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will be
Options
(a) 1000 W
(b) 750 W
(c) 500 W
(d) 250 W
Correct Answer:
250 W
Explanation:
P = V² / R. A bulb has a fixed resistance.
⇒ P₁ / P₂ = V₁² / V₂²
⇒ 10000 / P₂ = (220/110)² = 4
⇒ 4P₂ = 1000 ⇒ P₂ = 250 W
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body under the action of a force F⃗ = 6i⃗–8j⃗+10k⃗, acquires an accelerationof 1 m/s². The mass of this body must be
- A ball is dropped from the root of a tower of height h
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- Three capacitors each of capacitance C and of breakdown voltage V are joined in series
- A potentiometer wire of length 10 m and resistance 10 Ω per metre is connected in series
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Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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