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If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio of their resistances will be
Options
(a) (3:2)
(b) (2:3)
(c) (3:4)
(d) (4:3)
Correct Answer:
(3:2)
Explanation:
P = V² / R
⇒ R₁ / R₂ = P₂ / P₁ = 60 / 40 = 3 / 2 = 3 : 2
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In a uniform circular motion, work done in one complete rotation is
- If the earth shrink such that its mass does not change but radius decreases to one
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
- A spring balance is attached to the ceiling of a lift.A man hangs his bag on the spring
- A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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