Which one of the following bulbs has the least resistance ?
Correct answer: C. 300 watt
- A. 100 watt
- B. 200 watt
- C. 300 watt
- D. 60 watt
Explanation
For bulbs designed for the same voltage, R = V²/P, so resistance is inversely proportional to rated power. Thus the 300 W bulb has the least resistance: R = V²/(300 W), whereas the 100 W option has a larger resistance and is the most likely distractor.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Resistance and Resistivity questions
Which of the following substances posses the highest elasticity ?
What are the dimensions of stress ?
Which one of the following physical quantities does not have the dimensions of force per unit area ?
The resistance of a conductor at absolute zero (OK) is________________?
The graphical representation of Ohms law is___________________?
Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?