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MCQs -for Competitive Exams & Improve Knowledge

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Which gas is most abundant in natural gas?

  • (A) Methane
  • (B) Propane
  • (C) Butane
  • (D) Ethane

Answer: Methane

Methane is the main component of natural gas, accounting for about 70-90% of its content.

Which of the following is NOT a part of the human digestive system?

  • (A) Stomach
  • (B) Heart
  • (C) Large intestine
  • (D) Esophagus

Answer: Heart

The heart is part of the circulatory system, not the digestive system, which includes the stomach, large intestine and esophagus.

What is the smallest unit of an element?

  • (A) Molecule
  • (B) Proton
  • (C) Atom
  • (D) Neutron

Answer: Atom

The atom is the smallest unit of an element, consisting of protons, neutrons and electrons.

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Which organ in the human body is responsible for producing insulin?

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

Answer: Pancreas

The pancreas produces insulin, which helps regulate blood sugar levels.

What is the function of chlorophyll in plants?

  • (A) Absorb sunlight
  • (B) Store water
  • (C) Produce oxygen
  • (D) Absorb carbon dioxide

Answer: Absorb sunlight

Chlorophyll is the green pigment in plants that absorbs sunlight, which is crucial for photosynthesis.

What is the process by which water moves from the roots to the leaves of a plant?

  • (A) Transpiration
  • (B) Evaporation
  • (C) Osmosis
  • (D) Diffusion

Answer: Transpiration

Transpiration is the process where water is absorbed by plant roots, transported through the plant and released as vapor through the leaves.

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

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

Answer: Ionic bond

In ionic bonding, electrons are transferred from one atom to another, creating positive and negative ions that attract each other.

Which gas is released during photosynthesis?

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

Answer: Oxygen

Oxygen is released during photosynthesis as a byproduct of the process by which plants convert sunlight, carbon dioxide and water into glucose.

What is the primary function of the heart?

  • (A) Circulate oxygen
  • (B) Produce red blood cells
  • (C) Pump blood
  • (D) Break down food

Answer: Pump blood

The hearts primary function is to pump blood throughout the body, delivering oxygen and nutrients to tissues.

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What is the chemical symbol for the element silver?

  • (A) Ag
  • (B) Si
  • (C) Au
  • (D) Pb

Answer: Ag

Silver has the chemical symbol Ag, derived from the Latin word argentum.

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