UPSC Prelims Science and Technology Previous Year Questions, Tips to Prepare

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UPSC Prelims Science and Technology Previous Year Questions

UPSC Prelims Science and Technology Previous Year Questions are the best tools for UPSC CSE preparation. Candidates can answer these questions easily if they practice well. Science and Technology questions are basically based on current affairs or fundamental questions. Candidates should download UPSC Prelims Previous Year Question Paper to practice and get good score in the Science and Technology section. Check out some popular questions below from this section.

UPSC Prelims Science and Technology Questions

It is always suggested that take the help of the UPSC prelims syllabus and PYQ paper if you want to get shortlisted for the Mains exam. Around 10 to 12 questions will be from Science and Tech.

1. Consider the following:
(1) Aarogya Setu
(3) DigiLocker
Which of the above are built on top of open-source digital platforms?

(A) 1, 2, 3 and 4
(B) 1, 3 and 4 only
(C) 2, 3 and 4 only
(D) 1 and 2 only
Answer: (a) 1, 2, 3 and 4

2. Water can dissolve more substances than any other liquid because:
(A) It has a high value of specific heat,
(B) It is an oxide of hydrogen,
(C) It is dipolar in nature,
(D) It is a good conductor of heat.

Answer: (c) It is dipolar in nature

3. Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
(A) Polyvinyl Chloride,
(B) Polyethylene terephthalate,
(C) Polycarbonate,
(D) Low-density polyethylene

Answer: (c) Polycarbonate

4. “Triclosan” considered harmful when exposed to high levels for a long time, is most likely present in which of the following?
(A) Toiletries
(B) Reused plastic containers
(C) Fruit-ripening substances
(D) Food preservatives

Answer: (A) Toiletries

5. Which one of the following statements best describes the role of B cells and T cells in the human body?
(A) They protect the environmental allergens. body
(B) They alleviate the body’s pain and inflammation.
(C) They act as immunosuppressants in the body
(D) They protect the body from the diseases caused by pathogens.

Answer: D

6. With reference to “Software as a Service (SaaS)”, consider the following statements: (1) SaaS buyers can customise the user interface and can change data fields,
(2) SaaS users can access their data through their mobile devices
(3) Outlook, Hotmail and Yahoo! Mail are forms of SaaS.
Which of the statements given above are correct?
(A) 1 and 3 only
(B) 1, 2 and 3
(C) 1 and 2 only
(D) 2 and 3 only

Answer: B

7. With reference to street lighting, how do sodium lamps differ from LED lamps?
(1) Sodium lamps produce light at 360 degrees but it is not so in the case of LED lamps, (2) As street lights, sodium lamps have a longer life span than LED lamps
(3) The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the codes:
(A) 1, 2 and 3
(B) 1 and 3 only
(C) 2 only
(D) 3 only

Answer: D

8. Consider the following statements: DNA Barcoding can be a tool to:
1. Assess the age of a plant or animal
2. Distinguish among species that look alike
3. Identify undesirable animal or plant materials in processed foods.
Which of the statements given above is/are correct?
(A) 1 only
(B) 3 only
(C) 1 and 2
(D) 2 and 3

Answer: D

9. If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth?
1. GPS and navigation systems could fail.
2. Tsunamis could occur at equatorial regions.
3. Power grids could be damaged.
4. Intense auroras could occur over much of the Earth.
5. Forest fires could take place over much of the planet.
6. Orbits of the satellites could be disturbed.
7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted.
Select the correct answer using the code given below:
(A) 1, 2, 4 and 5 only
(B) 2, 3, 5, 6 and 7 only
(C) 1, 3, 4, 6 and 7 only
(D) 1, 2, 3, 4, 5, 6 and 7


10. Consider the following
1. Bluetooth device
2. Cordless phone
3. Microwave oven
4. Wi-Fi device
Which of the above can operate between 2-4 and 2-5 GHz range of radio frequency band?
(A) 1 and 2 only
(B) 3 and 4 only
(C) 1, 2 and 4 only
(D) 1, 2, 3 and 4

Answer: D

Also Read: UPSC Exam Date 2024 (Out)

Tips to Solve Prelims Science and Technology Question Paper

Below, we have mentioned some tips that will help you to solve the UPSC Prelims Science and Technology Previous Year Question Paper. Check them out:

  1. Keep an eye on latest events– Most questions from this section are directly related to current affairs and the latest developments. Following newspapers on a daily basis will help you to score well.
  2. Answer Easy Questions First- According to the UPSC Prelims Exam Pattern, You’ll have limited time and a negative marking system. Try to answer questions which you are 100% sure of.
  3. Eliminate Wrong Answers- If you don’t know the correct answer then try to eliminate the wrong answers and this will help you to find the right answer easily.

Best Books for UPSC Prelims Sci & Tech

Science and Technology section plays an important role in the Prelims & Mains exam. Below we have mentioned some best books for UPSC that will be helpful for you to prepare for the exam.

  1. NCERT Books from VI to XII
  2. General Science For Civil Services Preliminary Examinations – S.A.Majid
  3. 1000 Plus Questions on General Science – TMH

Apart from these books, you can follow daily newspapers and magazines for current affairs.

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