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MCQs -for Competitive Exams & Improve Knowledge

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Which gas is responsible for the greenhouse effect?

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

Answer: Carbon dioxide

Carbon dioxide is the primary gas responsible for trapping heat in the Earths atmosphere and contributing to the greenhouse effect.

Which planet is known for its Great Red Spot?

  • (A) Mars
  • (B) Saturn
  • (C) Neptune
  • (D) Jupiter

Answer: Jupiter

Jupiter is known for its Great Red Spot, a massive storm that has been raging for centuries.

What is the force that causes objects to fall towards the Earth?

  • (A) Friction
  • (B) Gravity
  • (C) Magnetism
  • (D) Inertia

Answer: Gravity

Gravity is the force that pulls objects towards the Earths center, causing them to fall when dropped.

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What is the center of an atom called?

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

Answer: Nucleus

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

Which element is most commonly found in living organisms?

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

Answer: Carbon

Carbon is the basis of life on Earth, forming the backbone of organic molecules like proteins, lipids and carbohydrates.

What is the term for the movement of water through a plant?

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

Answer: Transpiration

Transpiration is the process where plants lose water vapor through their leaves, which also helps in water movement through the plant.

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What is the process by which solid ice changes into a gas?

  • (A) Evaporation
  • (B) Sublimation
  • (C) Condensation
  • (D) Melting

Answer: Sublimation

Sublimation is the process where a solid changes directly into a gas, skipping the liquid phase, like ice turning into water vapor.

Which part of the human brain controls breathing?

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

Answer: Medulla

The medulla oblongata controls involuntary functions, including breathing, heart rate and digestion.

What is the primary component of air?

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

Answer: Nitrogen

Nitrogen makes up about 78% of the Earths atmosphere, while oxygen makes up about 21%.

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What is the largest planet in our solar system?

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

Answer: Jupiter

Jupiter is the largest planet in the solar system, known for its massive size and strong magnetic field.

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