UPSC 2013 Science and Technology Questions with Answers
12 previous year UPSC Prelims questions on Science and Technology in the UPSC 2013 Prelims. 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
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UPSC 2013Science and Technology · Miscellaneous
Q11. Many transplanted seedlings do not grow because:
Explanation
Transplanted seedlings often experience root injury during transplantation, which can lead to difficulties in establishment and growth. The majority of the water that is finally delivered to the plant’s top growth is absorbed by tiny roots that are farther from the plant and are covered by even smaller hairs. These delicate roots are typically killed after a transplant either by being chopped to reduce the size of the root ball or by drying out. It’s referred to as transplant shock. Transplant shock refers to a number of stresses that occur in recently transplanted trees and shrubs. It involves failure of the plant to root well, consequently the plant establishes poorly in the landscape. New transplants frequently experience stress due to a shortage of water because their root systems are not yet well established. Water stressed plants may be more vulnerable to harm from other factors, such as the environment, insects, or disease.
UPSC 2013Science and Technology · Miscellaneous
Q12. The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?
Explanation
Fundamental forces of nature can be categorised in four categories like Gravitational force, Weak Nuclear force, Electromagnetic force and Strong Nuclear force. Notably, latter three forces are all part of the Standard Model of physics Gravity and the electromagnetic force both have an unlimited range. However, despite its infinite reach, gravity is the weakest of the four fundamental forces. In contrast, the strong nuclear force is the strongest but operates only over a very short range. Strong Nuclear Force > Electromagnetic Force > Weak Nuclear Force > Gravitational Force. Options (b), (c) and (d) are correct:
Electromagnetic Force is weaker than the strong nuclear force. It acts between electrically charged particles. It also has infinite range and is attractive or repulsive. The Weak Nuclear Force is very weak and causes radioactive decay. It governs particle decay. It has a short-range. Strong Nuclear Force as the name suggests is very strong but has a short-range. It holds protons and neutrons inside the nucleus of the atom.
Answer key for these questions
Q
UPSC year
Correct answer
11
2013
(c) most of the root hairs are lost during transplantation
12
2013
(a) Gravity is the strongest of the four
Frequently asked questions
How many previous year UPSC questions are there on Science and Technology?
This page covers 12 previous year UPSC Prelims GS Paper-I questions on Science and Technology in the UPSC 2013 Prelims, asked from 1996 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 Science and Technology?
Questions on Science and Technology in the UPSC 2013 Prelims are available for 30 years, from 1996 to 2025. Use the Year filter to practise a single paper.
