Question
Download Solution PDFWhich of the following is dimensionless?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Longitudinal strain.
Key Points
CONCEPT:
- The powers to which fundamental quantities must be raised in order to express the given physical quantity are called its dimensions.
- A quantity without dimension will usually be a ratio of two quantities with similar dimensions and, hence, cancel out.
- Thus, they will have no units.
EXPLANATION:
- Longitudinal stress:
- Longitudinal stress is the stress which acts along the length and its unit is N/m2 or Pascal.
- Shear stress:
- If the deforming force acts tangentially to the surface of the body, It produces a change in the shape of the body.
- This tangential force applied per unit area is called shear stress.
- Its unit is N/mm2 or MPa.
- Deforming force:
- Deforming Force An external force applied to a body that changes its size or shape or both is called deforming force.
- its unit is N or kg-m/s2.
- Longitudinal strain:
- The change in the length (ΔL) to the original length (L) of the body is known as longitudinal strain.
i.e., \(Longitudinal\;strain = \frac{{{\rm{\Delta }}L}}{L}\)
- And since it is a ratio of two lengths, hence it is a dimensionless quantity.
Last updated on Jun 3, 2025
-> The Staff Selection Commission has officially released the SSC Selection Post Phase 13 Notification 2025 on its official website at ssc.gov.in.
-> A total number of 2423 Vacancies have been announced for various selection posts under Government of India.
-> The Computer Based Exam is scheduled from 24th July to 4th August, 2025. Candidates will be able to apply online from 2nd June 2025 to 23rd June 2025.
-> The SSC Selection Post Phase 13 exam is conducted for recruitment to posts of Matriculation, Higher Secondary, and Graduate Levels.
-> The selection process includes a CBT and Document Verification.
-> Some of the posts offered through this exam include Laboratory Assistant, Deputy Ranger, Upper Division Clerk (UDC), and more.
-> Enhance your exam preparation with the SSC Selection Post Previous Year Papers & SSC Selection Post Mock Tests for practice & revision.