| ⇦ | 
| ⇨ |
A spherical liquid drop of radius R is divided into 8 equal droplets. If the surface tension is T, then work done in the process will be
Options
(a) 2πR²T
(b) 3πR²T
(c) 4πR²T
(d) 2πRT²
Correct Answer:
4πR²T
Explanation:
Given: Surface tension = T
Radius of liquid drop = R
Let r be the radius of each small droplet
.·. Volume of big drop = volume of small droplets
(4/3) πR³ = 8 x (4/3) πr²
or R = 2r or r = R/2 ——(i)
Surface area of big drop = 4πR²
Surface are of 8 small droplets = 8 x 4πr²
8 x 4π x (R/2)² = 2(4πR²)
Increase in surface area = 2(4πR²) – 4πR² = 4πR²
Work done = T x increase in surface area
= T x 4πR² = 4πR²T.
Related Questions: - Equal charge q each are placed at the vertices AQ and B of an equilateral triangle
- Assuming the sun to have a spherical outer surface of radius r
- The angle of a prism is A. One of its refracting surfaces is silvered
- An engine pumps water through a hose pipe. Water passes through the pipe
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Equal charge q each are placed at the vertices AQ and B of an equilateral triangle
- Assuming the sun to have a spherical outer surface of radius r
- The angle of a prism is A. One of its refracting surfaces is silvered
- An engine pumps water through a hose pipe. Water passes through the pipe
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
Topics: Properties of Bulk Matter (130)
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