Everyday Science MCQs – Set 6
Practice 20 important Everyday Science MCQs covering human anatomy, nutrition, chemistry, physics, plants, weather, geology and astronomy. Click Show Correct Answer to reveal the answer with a short explanation.
1. Which part of the human heart prevents blood from flowing backward?
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Correct Answer: A. Valves
Heart valves open and close in response to pressure changes, helping keep blood flowing in one direction.
Heart valves open and close in response to pressure changes, helping keep blood flowing in one direction.
2. Which organ is primarily responsible for detoxifying many substances in the blood?
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Correct Answer: A. Liver
The liver processes many substances in the blood and helps break down toxins, drugs and other chemicals.
The liver processes many substances in the blood and helps break down toxins, drugs and other chemicals.
3. Which nutrient is the body's main source of energy during normal daily activities?
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Correct Answer: A. Carbohydrates
Carbohydrates are broken down into glucose and provide a major source of energy for the body's cells.
Carbohydrates are broken down into glucose and provide a major source of energy for the body's cells.
4. Which vitamin is important for maintaining normal vision, especially in dim light?
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Correct Answer: A. Vitamin A
Vitamin A is needed for normal vision and is involved in the function of light-sensitive cells in the retina.
Vitamin A is needed for normal vision and is involved in the function of light-sensitive cells in the retina.
5. Which structure connects muscles to bones?
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Correct Answer: B. Tendon
Tendons are strong connective tissues that attach muscles to bones and transmit the force produced by muscles.
Tendons are strong connective tissues that attach muscles to bones and transmit the force produced by muscles.
6. Which structure connects one bone to another at a joint?
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Correct Answer: B. Ligament
Ligaments are strong bands of connective tissue that connect bones and help stabilize joints.
Ligaments are strong bands of connective tissue that connect bones and help stabilize joints.
7. Which element is represented by the chemical symbol Au?
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Correct Answer: B. Gold
Au is the chemical symbol for gold and comes from the Latin word "aurum."
Au is the chemical symbol for gold and comes from the Latin word "aurum."
8. What happens to most substances when they are heated?
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Correct Answer: A. They generally expand
Heating usually increases the motion of particles, causing most materials to expand.
Heating usually increases the motion of particles, causing most materials to expand.
9. Which gas is released when most green plants carry out photosynthesis?
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Correct Answer: B. Oxygen
During photosynthesis, plants release oxygen as a by-product while using light energy to make organic compounds.
During photosynthesis, plants release oxygen as a by-product while using light energy to make organic compounds.
10. Which instrument is used to measure rainfall?
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Correct Answer: A. Rain gauge
A rain gauge collects and measures the amount of precipitation that falls over a particular period.
A rain gauge collects and measures the amount of precipitation that falls over a particular period.
11. Which atmospheric condition is most closely associated with the formation of fog?
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Correct Answer: A. Air becoming saturated with water vapour near the ground
Fog forms when air near the Earth's surface becomes saturated and water vapour condenses into tiny suspended droplets.
Fog forms when air near the Earth's surface becomes saturated and water vapour condenses into tiny suspended droplets.
12. Which force opposes the motion of an object moving across a surface?
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Correct Answer: B. Friction
Friction is a force that opposes relative motion between surfaces that are in contact.
Friction is a force that opposes relative motion between surfaces that are in contact.
13. Which unit is commonly used to measure electrical resistance?
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Correct Answer: C. Ohm
The ohm (Ω) is the SI derived unit used to measure electrical resistance.
The ohm (Ω) is the SI derived unit used to measure electrical resistance.
14. Which type of energy is associated with the motion of an object?
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Correct Answer: B. Kinetic energy
Kinetic energy is the energy possessed by an object because of its motion.
Kinetic energy is the energy possessed by an object because of its motion.
15. Which rock type is formed when molten rock cools and solidifies?
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Correct Answer: C. Igneous rock
Igneous rocks form when molten rock, such as magma or lava, cools and solidifies.
Igneous rocks form when molten rock, such as magma or lava, cools and solidifies.
16. Which natural process breaks rocks into smaller pieces at Earth's surface?
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Correct Answer: A. Weathering
Weathering is the breakdown of rocks at or near Earth's surface through physical, chemical or biological processes.
Weathering is the breakdown of rocks at or near Earth's surface through physical, chemical or biological processes.
17. Which phase of the Moon occurs when the Moon appears completely illuminated from Earth?
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Correct Answer: C. Full Moon
During a full moon, the side of the Moon facing Earth is almost completely illuminated by sunlight.
During a full moon, the side of the Moon facing Earth is almost completely illuminated by sunlight.
18. Which star is at the centre of our Solar System?
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Correct Answer: C. The Sun
The Sun is the star at the centre of the Solar System and provides most of the energy that drives Earth's climate and ecosystems.
The Sun is the star at the centre of the Solar System and provides most of the energy that drives Earth's climate and ecosystems.
19. Which process converts water vapour into liquid water?
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Correct Answer: B. Condensation
Condensation occurs when water vapour cools and changes into liquid water, forming droplets such as those in clouds or on a cold surface.
Condensation occurs when water vapour cools and changes into liquid water, forming droplets such as those in clouds or on a cold surface.
20. Which ecosystem is characterized by very low rainfall and sparse vegetation?
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Correct Answer: B. Desert
Deserts receive very little precipitation and typically have sparse vegetation adapted to dry conditions.
Deserts receive very little precipitation and typically have sparse vegetation adapted to dry conditions.
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