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MCQs -for Competitive Exams & Improve Knowledge

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What is the process of converting a solid directly into a gas?

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

Answer: Sublimation

Sublimation is the phase transition in which a solid turns directly into a gas without passing through the liquid phase.

What is the unit of pressure in the International System of Units?

  • (A) Pascal
  • (B) Newton
  • (C) Joule
  • (D) Watt

Answer: Pascal

The unit of pressure in the SI system is the Pascal (Pa), which measures force applied over an area.

Which of the following is a compound?

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

Answer: Water

Water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom.

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Which part of the brain controls balance and coordination?

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

Answer: Cerebellum

The cerebellum is responsible for coordinating movement and maintaining balance in the body.

What is the SI unit of electric current?

  • (A) Volt
  • (B) Ampere
  • (C) Ohm
  • (D) Joule

Answer: Ampere

The SI unit of electric current is the Ampere (A), which measures the flow of electric charge through a conductor.

What is the main component of the Earths atmosphere?

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

Answer: Nitrogen

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

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What is the center of an atom made up of?

  • (A) Electrons
  • (B) Protons
  • (C) Neutrons
  • (D) Nucleus

Answer: Nucleus

The nucleus of an atom contains protons and neutrons, while electrons orbit around the nucleus.

Which of the following is the largest bone in the human body?

  • (A) Femur
  • (B) Skull
  • (C) Spine
  • (D) Pelvis

Answer: Femur

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

Which gas is produced during photosynthesis?

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

Answer: Oxygen

Oxygen is produced during photosynthesis as a byproduct when plants convert carbon dioxide and water into glucose and oxygen using sunlight.

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What is the process of heat transfer through direct contact called?

  • (A) Conduction
  • (B) Convection
  • (C) Radiation
  • (D) Absorption

Answer: Conduction

Conduction is the transfer of heat energy through direct contact between molecules in solids, liquids, or gases.

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