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MCQs -for Competitive Exams & Improve Knowledge

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What is the chemical symbol for gold?

  • (A) Au
  • (B) Ag
  • (C) Ge
  • (D) Ga

Answer: Au

Golds chemical symbol is Au, derived from the Latin name Aurum.

What is the purpose of the human digestive system?

  • (A) To regulate temperature
  • (B) To transport oxygen
  • (C) To break down food
  • (D) To circulate blood

Answer: To break down food

The digestive system is responsible for breaking down food into nutrients that the body can absorb for energy and growth.

What is the most common element in the Earths crust?

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

Answer: Oxygen

Oxygen makes up about 46% of the Earths crust by weight, mainly combined with silicon to form silicates.

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Which planet is the second from the Sun?

  • (A) Earth
  • (B) Mars
  • (C) Venus
  • (D) Mercury

Answer: Venus

Venus is the second planet from the Sun and is known for its extreme temperatures and thick atmosphere.

Which organ in the human body produces bile?

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

Answer: Liver

The liver produces bile, which aids in the digestion and absorption of fats in the small intestine.

What type of bond involves the sharing of electrons between atoms?

  • (A) Ionic bond
  • (B) Covalent bond
  • (C) Hydrogen bond
  • (D) Metallic bond

Answer: Covalent bond

A covalent bond forms when two atoms share one or more pairs of electrons to achieve a stable electron configuration.

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Which gas is primarily responsible for the greenhouse effect?

  • (A) Oxygen
  • (B) Carbon dioxide
  • (C) Nitrogen
  • (D) Hydrogen

Answer: Carbon dioxide

Carbon dioxide traps heat in Earths atmosphere, contributing to the greenhouse effect, which leads to global warming.

What is the basic unit of genetic information?

  • (A) Cell
  • (B) Nucleotide
  • (C) Gene
  • (D) Chromosome

Answer: Gene

A gene is a segment of DNA that carries genetic information, determining traits in organisms.

Which of the following is an example of a compound?

  • (A) Oxygen
  • (B) Water
  • (C) Hydrogen
  • (D) Nitrogen

Answer: Water

Water (H2O) is a compound formed by the chemical bonding of two hydrogen atoms and one oxygen atom.

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What is the process by which an organism makes its own food?

  • (A) Respiration
  • (B) Photosynthesis
  • (C) Digestion
  • (D) Fermentation

Answer: Photosynthesis

Photosynthesis is the process by which plants convert light energy into chemical energy, using carbon dioxide and water.

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