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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
- The electric current in AC circuit is given by the relation i-3 sinωt+4 cos ωt.
- Two particles A and B, move with constant velocities V₁ and V₂. At the initial
- The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation
- A spring balance is attached to the ceiling of a lift.A man hangs his bag on the spring
- A monoatomic gas is suddenly compressed to (1/8)th of its initial volume adiabatically.
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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