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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
- A source of unknown frequency gives 4 beats/s, when sounded with a source harmonic
- Sodium has body centred packing. Distance between two nearest atoms is 3.7 Å.
- A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions
- An electron of a stationary hydrogen atom passes from the fifth energy level to
- For a satellite moving in an orbit around the earth, the ratio of kinetic
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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