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MCQs -for Competitive Exams & Improve Knowledge

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What is the chemical formula for hydrochloric acid?

  • (A) H2SO4
  • (B) HCl
  • (C) HNO3
  • (D) NaOH

Answer: HCl

Hydrochloric acid (HCl) is a strong acid commonly used in laboratories and industry.

What part of the cell contains genetic material?

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

Answer: Nucleus

The nucleus contains the cells genetic material (DNA) and controls cell activities like growth and reproduction.

Which of the following is an example of a chemical element?

  • (A) Water
  • (B) Oxygen
  • (C) Salt
  • (D) Sugar

Answer: Oxygen

Oxygen is a chemical element (O), while water, salt and sugar are compounds made up of multiple elements.

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What is the SI unit for electric current?

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

Answer: Ampere

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

Which of the following is the primary gas responsible for global warming?

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

Answer: Carbon dioxide

Carbon dioxide (CO2) is a greenhouse gas that traps heat in the Earths atmosphere, contributing to global warming.

What is the outermost layer of the Earth?

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

Answer: Crust

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

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What is the study of the behavior of matter and energy?

  • (A) Biology
  • (B) Chemistry
  • (C) Physics
  • (D) Geology

Answer: Physics

Physics is the branch of science that studies the behavior of matter, energy and their interactions.

What is the unit of electric charge?

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

Answer: Coulomb

The unit of electric charge is the Coulomb (C), representing the quantity of electricity transported by one ampere in one second.

Which of the following is an example of a force?

  • (A) Friction
  • (B) Temperature
  • (C) Mass
  • (D) Volume

Answer: Friction

Friction is a force that resists motion between two surfaces in contact.

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Which of the following is a good conductor of electricity?

  • (A) Plastic
  • (B) Wood
  • (C) Copper
  • (D) Glass

Answer: Copper

Copper is a good conductor of electricity and is commonly used in electrical wiring.

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