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MCQs -for Competitive Exams & Improve Knowledge

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What is the chemical symbol for sodium?

  • (A) Na
  • (B) S
  • (C) So
  • (D) Nd

Answer: Na

Sodiums chemical symbol is Na, derived from the Latin name Natrium.

What is the boiling point of water in Fahrenheit?

  • (A) 100?F
  • (B) 200?F
  • (C) 212?F
  • (D) 32?F

Answer: 212?F

The boiling point of water is 212?F at sea level, which is equivalent to 100?C.

What is the name of the force that pulls objects toward the Earth?

  • (A) Electromagnetic force
  • (B) Gravitational force
  • (C) Nuclear force
  • (D) Frictional force

Answer: Gravitational force

Gravity is the force that attracts objects towards the Earths center, keeping everything grounded.

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Which gas is responsible for the green house effect?

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

Answer: Carbon dioxide

Carbon dioxide traps heat in the Earths atmosphere, contributing to the greenhouse effect and climate change.

What is the outermost layer of the Earth called?

  • (A) Mantle
  • (B) Core
  • (C) Crust
  • (D) Lithosphere

Answer: Crust

The Earths crust is the outermost layer, made of solid rock and minerals.

What is the process by which a caterpillar turns into a butterfly?

  • (A) Metamorphosis
  • (B) Germination
  • (C) Photosynthesis
  • (D) Respiration

Answer: Metamorphosis

Metamorphosis is the process in which a caterpillar undergoes transformation into a butterfly.

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Which of the following is the lightest element?

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

Answer: Hydrogen

Hydrogen is the lightest element, consisting of just one proton and one electron.

Which part of the cell controls the cells activities?

  • (A) Nucleus
  • (B) Mitochondria
  • (C) Cytoplasm
  • (D) Ribosomes

Answer: Nucleus

The nucleus contains the cells genetic material and controls its activities, including growth and reproduction.

What is the primary component of the Earths core?

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

Answer: Iron

The Earths core is primarily composed of iron, with smaller amounts of nickel and other elements.

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Which gas is used by plants for photosynthesis?

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

Answer: Carbon dioxide

Plants use carbon dioxide (CO2) from the atmosphere to produce glucose during photosynthesis.

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