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
What is Newton's second law of motion?
Answer: Force equals mass times acceleration (F = ma)
Newton's second law states that force equals mass multiplied by acceleration: F = ma.
What is the SI unit of electric current?
Answer: Ampere
The Ampere (A) is the SI unit of electric current, defined as the flow of one coulomb per second.
The speed of light in vacuum is approximately how many km/s?
Answer: 300,000 km/s
The speed of light in vacuum is approximately 300,000 km/s (3 × 10⁸ m/s).
Which gas is produced when zinc reacts with dilute sulphuric acid?
Answer: Hydrogen
When zinc reacts with dilute H₂SO₄, zinc sulphate and hydrogen gas are produced: Zn + H₂SO₄ → ZnSO₄ + H₂.
What does DNA stand for?
Answer: Deoxyribonucleic Acid
DNA stands for Deoxyribonucleic Acid, the molecule that carries genetic information in living organisms.
Which phenomenon explains why the sky appears blue?
Answer: Rayleigh Scattering
Rayleigh Scattering causes shorter blue wavelengths of sunlight to scatter more than other colors, making the sky appear blue.
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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