Top 10 Most important MCQs for General Knowledge.

1. Which gas do plants absorb from the atmosphere during photosynthesis?

a) Oxygen

b) Nitrogen

c) Carbon Dioxide

d) Hydrogen

Correct Answer: c) Carbon Dioxide 

Explanation :-  The CO₂ (Carbon Dioxide) provides the carbon needed to build carbohydrates, which are essential for the plant's growth, energy, and overall metabolic processes.

2. What is the largest planet in our solar system?

a) Mars

b) Jupiter

c) Saturn

d) Earth

Correct Answer: b) Jupiter 

Explanation :- Jupiter is the largest planet because its early, massive core had a powerful gravitational pull, enabling it to capture enormous amounts of hydrogen and helium gas before other planets could.

3. What force is responsible for holding the planets in orbit around the sun?

a) Magnetism

b) Gravity

c) Friction

d) Tension

Correct Answer: b) Gravity 

Explanation :- This force is a fundamental attraction between any two objects with mass, such as the Sun and the planets. The greater mass of the Sun creates a powerful gravitational field that pulls on the planets, while the planets' own forward motion prevents them from falling directly into the Sun, resulting in a stable, continuous orbit. 

4. Which of the following is a renewable energy source?

a) Coal

b) Natural Gas

c) Wind

d) Petroleum

Correct Answer: c) Wind 

Explanation :- Wind is a renewable energy source because it's a naturally occurring resource that is constantly replenished, meaning it won't run out.

5. What is the process by which a liquid changes into a gas?

a) Condensation

b) Evaporation

c) Sublimation

d) Deposition

Correct Answer: b) Evaporation 

Explanation :- This happens because the liquid's particles absorb enough heat energy to increase their kinetic energy, move faster, and overcome the intermolecular forces of attraction holding them in the liquid state, allowing them to escape into the gas phase. 

6. Which part of the human body is responsible for pumping blood? 

a) Liver

b) Lungs

c) Heart

d) Brain

Correct Answer: c) Heart 

Explanation :- Because it is a muscular organ designed to continuously contract and relax, creating a force that pushes blood through the circulatory system.

7. What is the chemical symbol for gold?

a) Ag

b) Au

c) Fe

d) Hg

Correct Answer: b) Au 

Explanation :- Au comes from its Latin name, Aurum. Many elements have symbols derived from their Latin or Greek names.

8. Which planet is known as the "Red Planet"?

a) Venus

b) Mars

c) Jupiter

d) Saturn

Correct Answer: b) Mars 

Explanation :- Because its surface is covered in iron oxide, or rust, which gives it a distinctive reddish hue that is visible even to the naked eye from Earth. This widespread iron oxide on the planet's soil and dust is the primary reason for its characteristic red appearance in the sky.  

9. What is the name of the process by which plants make their own food?

a) Respiration

b) Photosynthesis

c) Digestion

d) Circulation

Correct Answer: b) Photosynthesis 

Explanation :- Photosynthesis is the process by which green plants, algae, and some bacteria use sunlight, water, and carbon dioxide to create their own food (sugar) and release oxygen as a byproduct. This process converts light energy into chemical energy stored in glucose (sugar) and requires chlorophyll, a green pigment, to absorb sunlight.

10. What is the hardest natural substance on Earth?

a) Diamond

b) Quartz

c) Iron

d) Gold

Correct Answer: a) Diamond

Explanation :- Due to the incredibly strong covalent bonds between its carbon atoms, which are arranged in a rigid, three-dimensional tetrahedral lattice. This tight, compact structure requires a huge amount of energy to break, making diamond extremely resistant to scratches and other forms of damage from external forces. 

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