Miscellaneous: UPSC Previous Year Questions (Science and Technology)
12 previous year UPSC Prelims questions on Miscellaneous (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 11–12 of 12 questions
UPSC 2011Science and Technology · Miscellaneous
Q11. A layer in the Earth’s atmosphere called Ionosphere facilitates radio communication. Why? 1. The presence of ozone causes the reflection of radio waves to Earth. 2. Radio waves have a very long wavelength. Which of the statements given above is/are correct?
Explanation
Statement 1 is incorrect: The presence of ions, and not ozone, in the Ionosphere is responsible for radio communication. Ozone is primarily present in the Stratosphere and not in the Ionosphere.
Statement 2 is incorrect: They have frequencies from 300 GHz to as low as 3 kHz and corresponding wavelengths from 1 millimetre to 100 kilometres. They have a long range of wavelengths, so they can have very small wavelengths as well.
UPSC 2011Science and Technology · Miscellaneous
Q12. A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed. The objective of this is:
Explanation
Bt Brinjal is the first Genetically Modified food crop in India that has reached the approval stage for commercialization. Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. Brinjal plants now have resistance to lepidopteran pests such the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer as a result of the gene’s insertion (Helicoverpa armigera).
Answer key for these questions
Q
UPSC year
Correct answer
11
2011
(d) Neither 1 nor 2
12
2011
(a) To make it pest-resistant
Frequently asked questions
How many previous year UPSC questions are there on Miscellaneous?
This page covers 12 previous year UPSC Prelims GS Paper-I questions on Miscellaneous (Science and Technology), asked from 2011 to 2025. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Miscellaneous?
Questions on Miscellaneous (Science and Technology) are available for 15 years, from 2011 to 2025. Use the Year filter to practise a single paper.
