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The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer?.

Solutions for The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.

Here you can find the meaning of The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The following itemare based on thepassagein English to test the comprehension of English language and therefore these itemdo not have Hindi version. Read thepassage and answerthe itemthat follow.English Passage - 2The helix is a complex shape found in many natural settings. It is commonlyillustrated by the shape of DNA molecules. The roots of some plants also burrow as helices, like corkscrews winding downward in search of richer soil. But during an experiment at Harvard University, mechanical engineers were surprised when a pair of rubber ribbons expected to form a helix did not, buckling into a shape rarely observed in nature.Every helix winds in a left or right direction. The engineers observed what they called a hemi helix: a helix that changes its direction midway. The region along which it changes its direction is called a perversion. Charles Darwin observed plant tendrils forming hemi helices in 1888. Thanks to the Harvard team, we know why they form: "as a result of elastic instabilities", according to Katia Bertoldi, a professor of applied mechanics at the university and a participant in the study."The geometry and pre-stretch parameters assign different competition power to these two categories," explained Dr. Bertoldi in an email. Specifically, they found that which shape forms depends on the strips' aspect ratio: the ratio of its length to width. With fixed stretching force for a given polymer, hemi helices were preferred for lower aspect ratios, when the buckling load increased. For ratios around or under 1, the number of perversions increased quickly. For ratios over 3, helices were preferred.Thus, by tweaking the make-up of certain elastic ribbons, Dr. Bertoldi's work shows we can deterministically manufacture complex 3D shapes from flat structures. This is already a ubiquitous enterprise — e.g. beating sheet metal into the chassis of a car. "The potential applications involve 3D electromagnetic wave-guides, and mechanical, thermal and chemical sensors," Prof. Bertoldi added.Q.The shape of hemi helices in nature was first observed bya)Charles Darwinb)The Harvard team of mechanical engineersc)Dr. Bertoldid)None oftheseCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice UPSC tests.