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MCQs -for Competitive Exams & Improve Knowledge

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Which of the following is a primary source of energy for the human body?

  • (A) Carbohydrates
  • (B) Proteins
  • (C) Fats
  • (D) Vitamins

Answer: Carbohydrates

Carbohydrates are the bodys primary source of energy, providing fuel for cells.

What is the main purpose of the circulatory system?

  • (A) Break down food
  • (B) Carry oxygen
  • (C) Produce hormones
  • (D) Filter waste

Answer: Carry oxygen

The circulatory system transports oxygen, nutrients and waste products throughout the body.

Which of the following is a non-metal?

  • (A) Iron
  • (B) Oxygen
  • (C) Copper
  • (D) Gold

Answer: Oxygen

Oxygen is a non-metal and is a vital component of the Earths atmosphere and living organisms.

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What is the largest planet in the solar system?

  • (A) Earth
  • (B) Jupiter
  • (C) Saturn
  • (D) Uranus

Answer: Jupiter

Jupiter is the largest planet in the solar system, with a diameter of about 139,820 km.

What is the most abundant element in the Earth?s crust?

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

Answer: Oxygen

Oxygen is the most abundant element in Earths crust, making up about 46% of the Earths composition.

Which part of the human brain is responsible for regulating heartbeat?

  • (A) Cerebrum
  • (B) Medulla oblongata
  • (C) Cerebellum
  • (D) Hypothalamus

Answer: Medulla oblongata

The medulla oblongata controls vital functions such as heart rate, breathing and blood pressure.

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What is the molecular formula of carbon dioxide?

  • (A) CO2
  • (B) CO
  • (C) C2O2
  • (D) CO3

Answer: CO2

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

What is the primary function of the respiratory system?

  • (A) Pump blood
  • (B) Break down food
  • (C) Exchange gases
  • (D) Produce hormones

Answer: Exchange gases

The respiratory system allows the body to take in oxygen and expel carbon dioxide through breathing.

Which of the following is a type of electromagnetic wave?

  • (A) Sound wave
  • (B) Light wave
  • (C) Ocean wave
  • (D) Water wave

Answer: Light wave

Light waves are a type of electromagnetic wave, part of the spectrum that also includes radio, microwaves and X-rays.

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What is the chemical formula of water?

  • (A) H2O
  • (B) H2O2
  • (C) O2
  • (D) OH-

Answer: H2O

Water consists of two hydrogen atoms and one oxygen atom, forming the compound H2O.

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