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MCQs -for Competitive Exams & Improve Knowledge

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What is the chemical formula for sulfuric acid?

  • (A) H2SO4
  • (B) HCl
  • (C) H2O
  • (D) CO2

Answer: H2SO4

Sulfuric acid has the chemical formula H2SO4, consisting of two hydrogen atoms, one sulfur atom and four oxygen atoms.

What is the largest internal organ in the human body?

  • (A) Brain
  • (B) Liver
  • (C) Stomach
  • (D) Heart

Answer: Liver

The liver is the largest internal organ in the human body, responsible for detoxification, metabolism and more.

Which organ in the human body produces insulin?

  • (A) Stomach
  • (B) Liver
  • (C) Pancreas
  • (D) Kidney

Answer: Pancreas

The pancreas produces insulin, which regulates blood sugar levels in the body.

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What is the process by which plants lose water through their leaves?

  • (A) Evaporation
  • (B) Transpiration
  • (C) Photosynthesis
  • (D) Condensation

Answer: Transpiration

Transpiration is the process where plants lose water vapor through small pores in their leaves.

What does the term biodiversity refer to?

  • (A) Different ecosystems
  • (B) Different species
  • (C) Genetic variety
  • (D) All of the above

Answer: All of the above

Biodiversity includes the variety of ecosystems, species and genetic diversity in an area.

What is the primary function of white blood cells?

  • (A) Carry oxygen
  • (B) Carry nutrients
  • (C) Fight infections
  • (D) Regulate body temperature

Answer: Fight infections

White blood cells are part of the immune system and are responsible for defending the body against pathogens.

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What is the hardest known natural material?

  • (A) Gold
  • (B) Diamond
  • (C) Iron
  • (D) Platinum

Answer: Diamond

Diamond is the hardest known natural material due to its crystal structure.

Which of the following is not a part of the electromagnetic spectrum?

  • (A) Radio waves
  • (B) Ultraviolet
  • (C) Sound waves
  • (D) X-rays

Answer: Sound waves

Sound waves are mechanical waves, not electromagnetic waves like radio, ultraviolet and X-rays.

Which organ is responsible for filtering blood in the human body?

  • (A) Liver
  • (B) Kidney
  • (C) Heart
  • (D) Lungs

Answer: Kidney

The kidneys filter waste and excess substances from the blood to form urine.

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Which element is the most abundant in the Earths crust?

  • (A) Oxygen
  • (B) Silicon
  • (C) Aluminum
  • (D) Iron

Answer: Oxygen

Oxygen is the most abundant element in the Earths crust, forming compounds like silicates and oxides.

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