| ⇦ | 
| ⇨ |
A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
Options
(a) 50%
(b) 90%
(c) 10%
(d) 30%
Correct Answer:
90%
Explanation:
? = P output / P input x 100
= 100 / 220 x 0.5 = 90.9%
Related Questions: - A galvanometer having internal resistance 10Ω requires 0.01 A for a full scale
- According to Hook’s law of elasticity, if stress is increased, the ratio of stress
- Maximum range for a projectile motion is given as R. The maximum height will be
- A lead bullet of 10 gm travelling at 300 m/s strikes against a block
- A carbon film resistor has colour code green, black, violet, gold. The value
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A galvanometer having internal resistance 10Ω requires 0.01 A for a full scale
- According to Hook’s law of elasticity, if stress is increased, the ratio of stress
- Maximum range for a projectile motion is given as R. The maximum height will be
- A lead bullet of 10 gm travelling at 300 m/s strikes against a block
- A carbon film resistor has colour code green, black, violet, gold. The value
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply