UPSC Prelims 2023 · GS Paper I
Science questions from UPSC 2023
Review every Science question in the 2023 paper with its answer and study explanation, then launch the same set under timed exam conditions.
Topic distribution
All 2023 Science questions
Open any question for the full options, answer, explanation, and syllabus metadata.
Question 1 · Biology
Consider the following statements : 1. Some mushrooms have medicinal properties. 2. Some mushrooms have psycho-active properties. 3. Some mushrooms have insecticidal properties. 4. Some mush...
Question 2 · Materials Science
Consider the following statements : 1. Carbon fibres are used in the manufacture of components used in automobiles and aircrafts. 2. Carbon fibres once used cannot be recycled. Which of the...
Question 3 · Defence Technology
Consider the following statements : 1. Ballistic missiles are jet-propelled at subsonic speeds throughout their flights, while cruise missiles are rocket-powered only in the initial phase of...
Question 4 · Space Technology
Which one of the following countries has its own Satellite Navigation System?
Question 5 · Biotechnology & Public Health
'Wolbachia method' is sometimes talked about with reference to which one of the following?
Question 6 · Biotechnology & Environmental Science
'Aerial metagenomics' best refers to which one of the following situations?
Question 7 · Genetics & Evolutionary Biology
'Microsatellite DNA' is used in the case of which one of the following?
Question 8 · Astronomy
Consider the following pairs : Objects in space : Description 1. Cepheids : Giant clouds of dust and gas in space 2. Nebulae : Stars which brighten and dim periodically 3. Pulsars : Neutron...
Question 9 · Science & Technology
With reference to green hydrogen, consider the following statements : 1. It can be used directly as a fuel for internal combustion. 2. It can be blended with natural gas and used as fuel for...
Question 10 · Microbiology
Consider the following statements : 1. Some microorganisms can grow in environments with temperature above the boiling point of water. 2. Some microorganisms can grow in environments with te...
Question 11 · Physics & Technology
Consider the following actions : 1. Detection of car crash/collision which results in the deployment of airbags almost instantaneously 2. Detection of accidental free fall of a laptop toward...
Question 12 · Economic Geography
Consider the following statements : Statement-I : India, despite having uranium deposits, depends on coal for most of its electricity production. Statement-II : Uranium, enriched to the exte...