Science & Technology Notes For UPSC – General Science Notes For IAS Preparation


Find below the pdfs of UPSC notes on Science and Technology for the Civil Services Exam. Science and Technology is part of both UPSC Prelims Syllabus and the UPSC Mains Syllabus (GS III). Also, science subjects like Botany, Chemistry and Biology are part of the optional subject choices in the IAS Mains exam. Subjects with a scientific base are highly scoring, yet they often poses a challenge to IAS aspirants, as students find it hard to make notes balancing both static and dynamic topics/issues in the news. Hence, we have provided Byju’s Science and Technology notes for IAS exam preparation.

How to prepare Science and Technology for UPSC exam?

  • Read/prepare notes
  • Read NCERTs
  • Check UPSC previous year question papers
  • If a Science subject is your optional subject, have a definite strategy
  • Follow daily news analysis

For all the above and more, check the links at the bottom of the article.

Science and Technology Notes for UPSC Prelims exam and IAS Mains



  • Biology – Human Organ Systems
    • Integumentary system
    • Digestive system
    • Respiratory system
    • Circulatory system
    • Nervous system
    • Muscular system
    • Skeletal system
  • Biology – Human Organ Systems (contd.)
    • Endocrine system
    • Reproductive system
  • Food and Nutrition
    • Important Terms
    • Hunger and Malnutrition
    • FSSAI Act 2006
    • Occupational Lifestyle Diseases
  • Biotechnology
    • Definition and explanation
    • Transgenic and Cisgenic Organisms
    • Types
    • Bt Brinjal
    • Bt Cotton
    • Genetic Pollution
    • Concerns about GM food


  • Information Technology
    • Important terms in IT
    • Cyber Warfare
  • Nanotechnology
    • Definition and basic information
    • Approaches to Nano Tech
    • Applications of Nanotechnology
  • Optics
    • Reflection
    • Refraction
  • Space Technology
    • Space Research
    • Types of Orbits
    • Geostationary v/s Geosynchronous
    • Types of Satellites
    • Challenges in building a Cryogenic engine
  • Modulation
    • Types of Modulation
    • Need for Modulation
  • Electromagnetic Spectrum
    • Important Terms
    • Types of EM Spectrum
  • Different generations in Wireless Telephony
    • 3G v/s 4G
  • Telecom Policies in India

General Science for UPSC prelims

For the UPSC prelims exam, a general knowledge of school level science is enough as the questions are rarely too technical. However, aspirants also need to track current affairs while preparing Science and Technology for both prelims and IAS mains.

Here are a few IAS exam questions from previous years Prelims papers to give you an idea.

Q.1 India-based Neutrino Observatory is included by the Planning Commission as a mega science project under the 11th five-Year Plan. In this context, consider the following statements:

  1. Neutrinos are chargeless elementary particles that travel close to the speed of light.
  2. Neutrinos are created in nuclear reactions of beta decay.
  3. Neutrinos have a negligible, but nonzero mass.
  4. Trillions of Neutrinos pass through human body every second.

Which of the statements given above are correct?

(a) 1 and 3 only

(b) 1, 2 and 3 only

(c) 2, 3 and 4

(d) 1, 2, 3 and 4

Solution: d

Q.2 During a thunderstorm, the thunder in the sky is produced by the

  1. Meeting of cumulonimbus clouds in the sky
  2. Lightning that separates the nimbus clouds
  3. Violent upward movement of air and water particles

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3

(C) 1 and 3

(d) None of the above produces the thunder

Solution: C

Q.3 Consider the following:

  1. Electromagnetic radiation
  2. Geothermal energy
  3. Gravitational force
  4. Plate movements
  5. Rotation of the earth
  6. Revolution of the earth

Which of the above are responsible for bringing dynamic changes on the surface of the earth?

(a) 1, 2, 3 and 4 only

(b) 1, 3, 5 and 6 only

(c) 2, 4, 5 and 6 only

(d) 1, 2, 3, 4, 5 and 6

Solution: d

Q.4 Recombinant DNA technology (Genetic Engineering) allows genes to be transferred

  1. across different species of plants
  2. from animals to plants
  3. from microorganisms to higher organisms

Select the correct answer using the codes given below:

  1. 1 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1,2 and 3

Solution: a

Q.5 ‘Ethanol’ has widespread usages and application. Consider the statements with reference to it

(1) It cannot be used as rocket propellant

(2) It can be used in thermometer

(3) It can be used as an antiseptic

(4) It causes cancer

(5) It can cause birth defects

(6) It cannot be used in DNA extraction because it is highly toxic

Correct code/s

(a) 1, 2, 3 and 5

(b) 1, 2, 4, 5 and 6

(c) 2, 3, 4 and 6

(d) 2, 3, 4 and 5

Answer: d

Feel ready for the challenge? Try Byju’s IAS Prelims Test Series – 2019 to get an idea where you stand in the crowd.

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