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MCQs -for Competitive Exams & Improve Knowledge

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Which of the following gases is most abundant in the Earths atmosphere?

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

Answer: Nitrogen

Nitrogen makes up approximately 78% of the Earths atmosphere, followed by oxygen at about 21%.

What is the main purpose of white blood cells?

  • (A) To digest food
  • (B) To transport oxygen
  • (C) To fight infection
  • (D) To carry nutrients

Answer: To fight infection

White blood cells are part of the immune system and defend the body against pathogens like bacteria and viruses.

What is the largest bone in the human body?

  • (A) Femur
  • (B) Tibia
  • (C) Humerus
  • (D) Radius

Answer: Femur

The femur is the largest and strongest bone in the human body, located in the thigh.

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Which of the following elements is essential for human respiration?

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

Answer: Oxygen

Oxygen is essential for cellular respiration, where cells generate energy by using oxygen to break down glucose.

What is the chemical formula for carbon dioxide?

  • (A) CO
  • (B) CO2
  • (C) C2O
  • (D) C3O

Answer: CO2

Carbon dioxide consists of one carbon atom and two oxygen atoms, with the formula CO2.

Which of the following is a function of the skeletal system?

  • (A) Producing energy
  • (B) Protecting vital organs
  • (C) Pumping blood
  • (D) Regulating temperature

Answer: Protecting vital organs

The skeletal system provides structural support and protection for vital organs, like the brain, heart and lungs.

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Which element is commonly used in the manufacture of batteries?

  • (A) Gold
  • (B) Zinc
  • (C) Lithium
  • (D) Carbon

Answer: Lithium

Lithium is commonly used in rechargeable batteries, especially for portable electronics and electric vehicles.

What is the center of the atom called?

  • (A) Electron
  • (B) Proton
  • (C) Neutron
  • (D) Nucleus

Answer: Nucleus

The nucleus is the central part of an atom, containing protons and neutrons.

What is the smallest unit of matter?

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

Answer: Atom

The atom is the smallest unit of matter that retains the properties of an element.

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Which of the following is an example of a physical change?

  • (A) Burning wood
  • (B) Melting ice
  • (C) Digesting food
  • (D) Rusting iron

Answer: Melting ice

Melting ice is a physical change because the ice changes from solid to liquid without altering its chemical composition.

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