| ⇦ | 
| ⇨ |
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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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- 1 Wb/m² equal to
- In a given reaction, ᴢXᴬ → ᴢ+1Yᴬ → ᴢ-1Kᴬ⁻⁴ → ᴢ-1Kᴬ⁻⁴
- Three cells, each of e.m.f 1.5 V and internal resistance 1 ohm are connected in parallel
- If |A x B|= √3 A.B , then the value of |A + B| is
- A particle is executing the motion x=Acos (ωt-θ). The maximum velocity of the particle is
Topics: Magnetic Effects of Current and Magnetism (167)
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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