Robots are machines that sense, decide and act. Nanotechnology works with matter at the scale of atoms and molecules.
The two fields look unrelated. Yet they share one lesson for exams: a smart idea matters only when it can be built cheaply and at scale.
- A robot has sensors, actuators and a control system.
- Nanotechnology works at the size of a billionth of a metre.
- India’s Nano Mission began in May 2007 with ₹1,000 crore over five years.
- Robots in India face a different cost test, because human labour is plentiful.
What robotics is and how a robot works
What is a robot, and what is robotics?
A robot is a machine that senses its surroundings, makes a choice and then acts. Robotics is the study of building and using such machines.
Robots do not need a human body. A factory arm, a vacuum cleaner and a surgical system are all robots.
- Sensing: it gathers data from the world.
- Thinking: it decides what to do next.
- Acting: it moves or changes something.
Sources: ThinkRobotics: parts of a robot.
What are the three main parts of a robot?
Every robot has three working parts. Together they copy the way a living body works.
Sensors are the eyes and ears. They measure light, touch, distance or temperature.
Actuators are the muscles. They are motors or pumps that create movement.
The control system is the brain. It reads the sensors and tells the actuators what to do.
- Sensors: cameras, touch pads, distance finders.
- Actuators: electric motors, hydraulic and air-driven parts.
- Control system: a computer running the robot’s program.
Sources: Evetech: sensor vs actuator; ThinkRobotics: parts of a robot.
What kinds of robots are there?
Robots come in many types. The kind depends on the job.
Industrial robots are fixed arms. They weld, paint and lift on factory floors.
Service robots work near people. A robot vacuum is one simple example.
Medical robots assist surgeons. They add steadiness and precision.
- Industrial: welding, painting, assembly.
- Service: cleaning and delivery.
- Medical: surgery support.
Sources: ThinkRobotics: parts of a robot; IFR: robots in India, 2024.
Which jobs suit robots best?
Robots suit work that is dull, dirty or dangerous. They do not tire or lose focus.
A robot can repeat one task thousands of times with the same accuracy. People are better at judgement, care and new situations.
So most real plants use robots and workers together.
Sources: Evetech: sensor vs actuator.
What are Asimov’s laws of robotics?
Isaac Asimov was a writer. He proposed early, influential rules for robot behaviour in his stories.
The rules say a robot must not harm humans. It must obey humans unless that causes harm. It must protect itself unless that breaks the first two rules.
They are fiction, not law. But they began the modern debate on machine ethics.
Sources: Full Sail: the three laws.
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Asimov is credited with proposing early, influential laws of robotics.
Check 2
A robot’s actuators are the part that senses the surroundings.
What nanotechnology is and why size matters
What does nanotechnology mean?
Nanotechnology is the science of controlling matter at the scale of atoms and molecules. The usual range is 1 to 100 nanometres.
A nanometre is a billionth of a metre. The scale is almost too small to picture.
A human hair is about 80,000–100,000 nanometres wide. A nano-device is thousands of times thinner.
- 1 nanometre = one billionth of a metre.
- Hair width: 80,000–100,000 nm.
- At this size, materials can behave in new ways.
Sources: NNI: how big is a nanometre; Bhatt & Joshi: India’s Nano Mission.
Why is the nanoscale called a new world?
Scientists can now see and move single atoms. That lets them build materials from the bottom up.
This is the idea behind nanotechnology. Instead of cutting a big block down, you assemble tiny parts.
Sources: RajRAS: Nano Mission.
Why do materials act differently at the nanoscale?
At this size, a material has far more surface for its weight. So more of it can react.
Its strength, colour and electrical behaviour can change too. Scientists design these changes on purpose.
This is why nano-materials are used in medicine, energy and industry.
Sources: Bhatt & Joshi: India’s Nano Mission; NNI: how big is a nanometre.
Robots and nanotech at work
How do robots help in surgery?
In robotic surgery, a surgeon guides small robotic arms through tiny cuts. The arms steady the hand and shrink the cut.
Cuts are smaller, so patients often recover faster. The surgeon stays in full control.
Sources: ThinkRobotics: parts of a robot; Evetech: sensor vs actuator.
How is nanotechnology used in medicine and materials?
Nanomedicine uses tiny particles to carry a drug straight to diseased cells. Healthy cells then see less of the drug.
Nanomaterials are lighter and stronger than ordinary ones. They are used in coatings, electronics and batteries.
The health side is covered fully in SciTech0043 and SciTech0160.
Sources: NNI: how big is a nanometre; Tribune: light-driven nanobots.
Does tiny size bring risks?
Yes, it can. Very small particles may enter the body or the environment more easily than large ones.
So new nano-products need safety testing before wide use. Rules and testing are still catching up with the science.
Sources: NNI: how big is a nanometre; RajRAS: Nano Mission.
How can nanotechnology help agriculture?
Nano-based fertilisers and pesticides aim to deliver nutrients or protection more precisely. They could cut the total amount of chemicals used.
This is still an active research area. Field results are not yet settled.
Sources: Bhatt & Joshi: India’s Nano Mission.
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Nanomedicine aims to carry drugs straight to diseased cells.
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One nanometre is a millionth of a metre.
India’s push: the Nano Mission
What is India’s Nano Mission, and when did it start?
The Nano Mission was approved in May 2007. The Department of Science and Technology (DST) is its nodal agency.
It was given ₹1,000 crore over five years. It grew out of DST’s earlier Nano Science and Technology Initiative, running since 2001.
In 2014, the mission continued into a second phase with ₹650 crore.
- Approved: May 2007; nodal agency: DST.
- First budget: ₹1,000 crore for five years.
- Earlier base: the initiative of 2001; Phase II: ₹650 crore from 2014.
Sources: RajRAS: Nano Mission; Bhatt & Joshi: India’s Nano Mission.
What does the Nano Mission fund?
It has five aims. Each one builds a part of the nano ecosystem.
The aims are basic research and centres of excellence, shared facilities, applications, trained people and global links.
- Basic research and centres of excellence.
- Shared facilities for labs.
- Applications and technology development.
- Human resources and training.
- International collaboration.
Sources: Bhatt & Joshi: India’s Nano Mission; RajRAS: Nano Mission.
Does robotics help or hurt India’s workers?
India has plentiful labour at low cost. So the cost-benefit trade-off of automation differs from high-wage countries.
India installed about 9,100 industrial robots in 2024, up 7%. That ranks it sixth in the world for new installations.
Automotive makes up about 45% of those installs. Automation can displace some jobs. It also creates demand for skilled operators.
Sources: IFR: robots in India, 2024.
Why does manufacturing matter more than the breakthrough?
A technology’s impact often depends less on the science itself. It depends more on how cheaply and reliably it can be built at scale.
Both robots and nanotech follow this rule. A lab result changes little until a factory can repeat it.
Sources: RajRAS: Nano Mission; NNI: how big is a nanometre.
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The Nano Mission was approved in May 2007 with ₹1,000 crore over five years.
Check 6
Robots mean automation always adds more jobs than it removes in every setting.
Exam traps
Carbon nanotube trap. UPSC CSP 2020 (Q41) tested four claims at once. Nanotubes can carry drugs and antigens, work in biochemical sensors, and are biodegradable. The claim that they can be made into artificial blood capillaries is the one the official key does not accept.
Carbon nanotube trap, part two. Read all four claims before you pick an option. See UPSC CSP 2020, Q41.
Nano-health trap. UPSC CSP 2015 (Q23) asked whether nanotechnology can deliver targeted drugs and gene therapy. Both statements are correct. See UPSC CSP 2015, Q23.
Mains angle. GS-III Mains 2016 asked why nanotechnology is a key technology of the 21st century. It also asked for the Nano Mission’s salient features. Build the answer in three layers: what nano is, what the mission funds, and which real uses follow.
Current affairs. In Aug 2026, INST Mohali and BARC Mumbai unveiled a light-driven nanobot for breast cancer. It uses folic acid to find cancer cells. It was tested in tumour-bearing mice, not yet in humans. See The Tribune.
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