Question
A soap bubble expands isothermally and its radius
doubles. The work done by surface tension during this expansion is:ÂSolution
When a soap bubble expands, work is done against surface tension to increase the surface area. A soap bubble has two surfaces (inner and outer), so total surface area is twice that of a single sphere. Let:
- Initial radius =
- Final radius = 2R
- Surface tension = T
In each of the given questions, three sentences are given with a phrase/idiom highlighted in bold. You have to select the answer choice that s...
Directions : In the following question, three statements are given with an idiom highlighted in bold. You have to select the answer choice that has the...
She can’t keep her head above water with all of the new orders.
- Select the most appropriate meaning of the bolded idiom in the following sentence.
After the argument, he decided to bury the hatchet and move on w... Select the most appropriate meaning of the given idiom.
Spill the beans
- Waiting for the _______ to jump Â
Angry residents are up in arms over a proposal to site a giant mobile phone mast near their homes.
In the following question, a sentence is given with the phrase or idiom highlighted in bold. Select the option given below that cannot replace the phra...
Directions : An idiom/phrase is given in bold. Following this idiom/phrase are given three sentences, which use the given idiom/phrase. The idiom/phras...
After weeks of practice, the team was finally able to get their act together before the big game.
Relevant for Exams:
