Science and Technology PYQs — UPSC Prelims

All 575 Science and Technology Previous Year Questions for UPSC Prelims, with answers and explanations. Click any question for the full solution.

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With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements : 1. All types of UAVs can do vertical landing. 2. All types of UAVs can do automated hovering. 3. All types of UAVs can use battery only as a source of power supply. How many of the statements given above are correct?
In the context of electric vehicle batteries, consider the following elements : 1. Cobalt 2. Graphite 3. Lithium 4. Nickel How many of the above usually make up battery cathodes?
Consider the following substances : 1. Ethanol 2. Nitroglycerine 3. Urea Coal gasification technology can be used in the production of how many of them?
Consider the following statements : 1. No virus can survive in ocean waters. 2. No virus can infect bacteria. 3. No virus can change the cellular transcriptional activity in host cells. How many of the statements given above are correct?
Consider the following statements : 1. Statement I: Activated carbon is a good and an attractive tool to remove pollutants from effluent streams and to remediate contaminants from various industries. 2. Statement II: Activated carbon exhibits a large surface area and a strong potential for adsorbing heavy metals. 3. Statement III : Activated carbon can be easily synthesized from environmental wastes with high carbon content. Which one of the following is correct in respect of the above statements?
Consider the following statements : 1. Statement I: Some rare earth elements are used in the manufacture of flat television screens and computer monitors. 2. Statement II : Some rare earth elements have phosphorescent properties. Which one of the following is correct in respect of the above statements?
With reference to monoclonal antibodies, often mentioned in news, consider the following statements : 1. They are man-made proteins. 2. They stimulate immunological function due to their ability to bind to specific antigens. 3. They are used in treating viral infections like that of Nipah virus. Which of the statements given above are correct?
Consider the following space missions : 1. Axiom-4 2. SpaDeX 3. Gaganyaan How many of the space missions given above encourage and support micro-gravity research?
GPS-Aided Geo Augmented Navigation (GAGAN) uses a system of ground stations to provide necessary augmentation. Which of the following statements is/are correct in respect of GAGAN? 1. It is designed to provide additional accuracy and integrity. 2. It will allow more uniform and high quality air traffic management. 3. It will provide benefits only in aviation but not in other modes of transportation. Select the correct answer using the code given below.
Consider the following statements : 1. It is expected that Majorana 1 chip will enable quantum computing. 2. Majorana 1 chip has been introduced by Amazon Web Services (AWS). 3. Deep learning is a subset of machine learning. Which of the statements given above are correct?
Consider the following countries : 1. United Arab Emirates 2. France 3. Germany 4. Singapore 5. Bangladesh How many countries amongst the above are there other than India where international merchant payments are accepted under UPI?
Consider the following statements : 1. Indian Railways have prepared a National Rail Plan (NRP) to create a 'future ready' railway system by 2028. 2. 'Kavach' is an Automatic Train Protection system developed in collaboration with Germany. 3. 'Kavach' system consists of RFID tags fitted on track in station section. Which of the statements given above are not correct?
With reference to 'Direct Air Capture', an emerging technology, which of the following statements is/are correct? 1. It can be used as a way of carbon sequestration. 2. It can be a valuable approach for plastic production and in food processing. 3. In aviation, it can be a source of carbon for combining with hydrogen to create synthetic low-carbon fuel. Select the correct answer using the code given below.
Consider the following types of vehicles : 1. Full battery electric vehicles 2. Hydrogen fuel cell vehicles 3. Fuel cell-electric hybrid vehicles How many of the above are considered as alternative powertrain vehicles?

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