📄 All MCQs
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277–288 of 322
Vitamin D deficiency causes?
💡 Explanation: Rickets disease
Daily air intake?
💡 Explanation: Approx breathing
Most abundant in Earth crust?
💡 Explanation: Oxygen highest
Most abundant element in universe?
💡 Explanation: Hydrogen dominates
Average blood volume in adults?
💡 Explanation: Approx 5 liters
The Sun is a?
💡 Explanation: Sun is a star
Second most abundant element in Sun?
💡 Explanation: Helium ~25%
Who discovered radioactivity?
💡 Explanation: Discovered in 1896
What is the density of water?
💡 Explanation: Standard density
Average lifespan of red blood cells?
💡 Explanation: RBC lifespan is 120 days
What happens to pressure when gas volume decreases?
💡 Explanation: Boyle’s law
Who discovered the photoelectric effect?
💡 Explanation: Einstein won Nobel Prize