Physics and Science Flashcards
6 cards from real CDS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Physics and Science flashcards as text
The unit of electrical resistance is named after which scientist?
Answer: Georg Ohm
The Ohm (Ω), the unit of electrical resistance, is named after German physicist Georg Simon Ohm.
Which planet is known as the 'Red Planet'?
Answer: Mars
Mars is called the Red Planet because its surface is covered with iron oxide (rust), giving it a reddish appearance.
What is the process by which plants make food using sunlight called?
Answer: Photosynthesis
Photosynthesis is the process by which plants convert sunlight, CO₂, and water into glucose and oxygen.
Sonar technology uses which type of waves to detect underwater objects?
Answer: Sound waves
Sonar (Sound Navigation And Ranging) uses sound waves (ultrasonic) to detect and locate underwater objects.
What is the atomic number of hydrogen?
Answer: 1
Hydrogen has atomic number 1, meaning it has one proton in its nucleus; it is the simplest element.
Which type of lever has the fulcrum between the effort and the load?
Answer: First-class lever
In a first-class lever, the fulcrum is positioned between the effort and the load, like a seesaw or crowbar.
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Sources & references
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- upsc.gov.in — Test delivery, fees, exam format, passing score, retake policy, time limit · verified Oct 2026