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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
- If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
- A body travels 200 cm in the first two seconds and 220 cm in the next 4 secs
- If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
- In a diffraction pattern due to a singleslit of width a, the first minimum is observed
- A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens
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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