The size of particles being studied in 'nano-technology' is about
- A.1 Å - 10 nm
- B.1 - 100 nm
- C.1 - 50 µ
- D.1 mm - 10 mm
Correct answer
Explanation
The correct answer is B, 1 - 100 nm. Nanotechnology deals with matter at the scale of roughly 1 to 100 nanometres, where materials begin to show new properties.
One nanometre is a billionth of a metre (10-9 m), about the width of ten hydrogen atoms in a row; a human hair is around 80,000 nm thick. At the nanoscale, a very large share of a particle's atoms sit on its surface, and quantum effects appear, so a material's colour, strength, conductivity or chemical activity can change. Gold nanoparticles, for instance, look red or purple instead of yellow. Richard Feynman's 1959 talk There's Plenty of Room at the Bottom is often taken as the start of the idea, and Norio Taniguchi coined the word nanotechnology in 1974.
Option A is wrong because 1 Å to 10 nm covers only the lower part of the range. Option C is wrong because micrometres are a thousand times larger than nanometres. Option D is wrong because millimetres are visible sizes, a million times larger.
Exam tip: nanoscale = 1–100 nm; 1 nm = 10-9 m = 10 Å.
Practice Questions
View all"Million Minds Augmenting National Aspirations and Knowledge" (MANAK), a scheme under the flagship programme, Innovation in Science Pursuit for Inspired Research (INSPIRE), caters to :
- A.The college students studying in the undergraduate programme in the age group of 19 - 25 years.
- B.The research scholars in recognized research laboratories of national importance.
- C.The college teachers of the country.
- D.The school children studying in classes 6 - 10 in the age group of 10 - 15 years.
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INSPIRE-MANAK is the school-level part of INSPIRE. INSPIRE is run by the Department of Science and Technology to draw young talent into science.
Read the full explanation →Which one of the following statements is not correct?
- A.BrahMos is a supersonic cruise missile made by India and Russian Federation.
- B.The name BrahMos came from two rivers, Brahmaputra of India and Moskva of Russia.
- C.Indian military scientists were capable of integrating BrahMos cruise missile with Sukhoi-30 MKI fighter.
- D.Defence Research and Development Organization is the manufacturer of Sukhoi-30 MKI fighter.
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The Sukhoi-30 MKI is not made by DRDO; it was designed by Russia's Sukhoi bureau and is built in India under licence by Hindustan Aeronautics Limited (HAL) at Nashik.
Read the full explanation →'Tejas' is the name of which one of the following?
- A.Main battle tank
- B.Nuclear submarine
- C.Light combat aircraft
- D.Aircraft carrier
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Tejas is India's indigenous single-engine light combat aircraft built for the Indian Air Force. The Light Combat Aircraft programme was started in the 1980s to replace the ageing MiG-21 fleet.
Read the full explanation →Which one of the following is an indigenous assault rifle developed by DRDO?
- A.Heckler
- B.T91
- C.Tikka
- D.Ugram
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Ugram is a 7.62 mm assault rifle designed in India by DRDO for the armed forces and police. Ugram was developed by the Armament Research and Development Establishment (ARDE), Pune, a DRDO laboratory, together with a private Hyderabad firm, Dvipa Armour India, and it was unveiled in January 2024.
Read the full explanation →Ethereum, Tether, Solana and Cardano are all forms of
- A.Crypto currency
- B.Artificial Intelligence(AI) Startups
- C.Humanoid Robots
- D.Medical apps
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Ethereum, Tether, Solana and Cardano are all cryptocurrencies, digital assets recorded on blockchains rather than issued by a central bank.
Read the full explanation →