The geometry of the plastic zone in front of a crack tip is shown in the following figure.

The geometry of the plastic zone in front of a crack tip is shown in the following figure. Correct Answer True

The given diagram represents the state of crack opening correctly. The width of a crack causes the successive displacement of the break and is called the crack opening displacement.
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Focusing on plastic pollution, the June issue of the National Geographic magazine created quite a buzz on social media, contrary to expectations after the cover featured a plastic bag submerged in an ocean with a ’Planet or Plastic?’ text on it. Ironically, the magazine itself was wrapped in a double layer of plastic. Which of the following options can be the reason for the magazine to go viral on the internet as inferred from the statements? I. It highlighted the amount of single-use plastic that enters in the world’s oceans which is a major environmental concern these days. II. National Geographic kicked off its ‘Planet or Plastic’ campaign, the magazine’s multiyear effort to raise awareness about the global plastic trash crisis through the cover. III. The magazine about ocean plastic pollution came wrapped in a plastic bag inside another plastic bag. IV. Because they realized the major flaw and announced that the magazine will no longer be shipped to readers in a plastic bag but will be sent out in a paper envelope instead.
According to Irwin’s correction of plasticity at the crack tip, the sufficient crack length is given as the actual crack length plus the radius of the plastic zone. The radius of the plastic zone (rp) in case of plane stress is given as ________
According to Irwin’s correction of plasticity at the crack tip, the effective crack length is given as the actual crack length plus the radius of the plastic zone. The radius of the plastic zone (rp) in case of plane strain is given as ________
Which of the following sequence of Heat zones is/are correctly placed? A) Torrid zone, South temperate zone and Frigid zone. B) Torrid zone, North temperate zone and Frigid zone. C) South temperate zone, torrid zone and Frigid zone. Select the correct answer given below.
In the following question, the first and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/passage is split into four parts and named P, Q, R, S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. S1. Plastic bags are a major cause of environmental pollution. P. Many countries around the globe have either ban the plastic bag or Levi tax on it. Q. Plastic as a substance is non-biodegradable and thus plastic bags remain in the environment for hundreds of years polluting it immensely. R. However, the problem hasn’t been solved completely because the implementation of these measures hasn’t been as successful. S. It has become very essential to ban plastic bags before they ruin our planet completely. S6. Research shows that waste plastic bags have been a major reason for untimely animal deaths.
Consider the following statements regarding crack : 1. Crack is more likely to occur in the regions of discontinuity such as oil holes. 2. Crack is more likely to occur in the regions of irregularities in machining operations such as stamp mark. 3. Crack is more likely to occur in the internal cracks due to defects in materials like blow holes. Which of the above statements are correct ? 
The following sentences form a paragraph.They are numbered as P, Q, R and S. These four parts are not given in their proper order. Read the sentences and choose the alternative that arranges them in correct order. P. Unfortunately, it is not free of this menace — plastic waste can be seen littered everywhere in this pristine evergreen stretch that is host to numerous species of wildlife.  Q. In order to have a plastic-free world, we have to unlearn the habit of ‘use and throw’. I am working in a biodiversity hotspot situated in the Western Ghats in Kerala.  R. Despite boards that say ‘Littering is prohibited’, visitors still bring plastic with them and leave behind a carpet of waste.  Plastic is slowly choking the environment and we need to stop this. S. Plastic bottles and covers can be seen in the crystal clear waters of forest streams even deep in the forests. 
Read the given passage and answer the question that follows. Plastic is extremely harmful for the earth and the environment. Plastic that we use eventually ends up in landfills and it takes hundreds of years to biodegrade. This plastic stays on the earth and pollutes land and oceans. There is a dire need to eliminate the use of plastic and to reduce and recycle the plastic that already exists in the landfills. Which of the following argument could be made from the above passage?
Given below are four-sentence paragraphs (S1 -S4). S1 and S4 are given. From the options (P, Q, R) choose two sentences which can be S2 and S3. S1: Today, you can hardly look around you and not spot some item that is made entirely from plastic or has some plastic ingredient.  S2: S3: S4: Because of this many governments strictly control its use and create complex law that govern its creation, recycling P. This is not perfect as plastic has several disadvantages that prevent it from becoming universal building block of modern human civilization. Q. This only proves that plastic has managed to become popular building material of millions of useful items. R.  This troublesome ability of plastic doesn’t have great immediate impact on our environment.
The young’s modulus of the steel is 600 MPa, and the plastic stress required to extend the crack is 50*10-9, and the initial crack length is 2 microns. Find the fracture stress required to crack the material?