UPSC Prelims 2021 · GS Paper I
Science questions from UPSC 2021
Review every Science question in the 2021 paper with its answer and study explanation, then launch the same set under timed exam conditions.
Topic distribution
All 2021 Science questions
Open any question for the full options, answer, explanation, and syllabus metadata.
Question 1 · Physics
With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street-lights, sod...
Question 2 · Microbiology
Consider the following : 1. Bacteria 2. Fungi 3. Virus Which of the above can be cultured in artificial/synthetic medium?
Question 3 · Biotechnology & Vaccines
With reference to recent developments regarding 'Recombinant Vector Vaccines', consider the following statements : 1. Genetic engineering is applied in the development of these vaccines. 2....
Question 4 · Physics
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following? 1. Area of the hole in the lid 2. Temperature of the flame 3. Weight of the lid...
Question 5 · Biotechnology & Human Health
In the context of hereditary diseases, consider the following statements : 1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy eit...
Question 6 · Chemistry & Properties of Water
Water can dissolve more substances than any other liquid because
Question 7 · Biotechnology
Bollgard I and Bollgard II technologies are mentioned in the context of
Question 8 · Biology & Virology
Consider the following statements : 1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes. 2. Common cold is sometime caused by an adenovirus...
Question 9 · Physics & Astronomy
Which one of the following is a reason why astronomical distances are measured in light-years?
Question 10 · Biology
The term 'ACE2' is talked about in the context of