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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 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω
- A cricketer can throw a ball to a maximum horizontal distance of 100 m. With the same
- A small rod of bismuth is suspended freely between the poles of a strong electromagnet.
- If h is the height of the capillary rise and r be the radius of capillary tube,
- Heat produced in a resistance according to which law?
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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