Everyday Science MCQs – Set 10
Practice 20 important Everyday Science MCQs covering human biology, chemistry, physics, plants, environment, earth science and astronomy. Click Show Correct Answer to reveal the answer with a short explanation.
1. Which organ is the main site of gas exchange in the human lungs?
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Correct Answer: B. Alveoli
Alveoli are tiny air sacs surrounded by capillaries where oxygen enters the blood and carbon dioxide leaves it.
Alveoli are tiny air sacs surrounded by capillaries where oxygen enters the blood and carbon dioxide leaves it.
2. Which substance in red blood cells binds with oxygen?
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Correct Answer: B. Haemoglobin
Haemoglobin is an iron-containing protein in red blood cells that binds oxygen and helps transport it around the body.
Haemoglobin is an iron-containing protein in red blood cells that binds oxygen and helps transport it around the body.
3. Which organ produces most of the body's bile?
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Correct Answer: A. Liver
The liver produces bile, which helps the body digest and absorb fats.
The liver produces bile, which helps the body digest and absorb fats.
4. Which part of the nephron is primarily responsible for filtering blood to form the initial filtrate?
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Correct Answer: A. Glomerulus
The glomerulus is a network of tiny blood vessels where pressure filters water and small dissolved substances from the blood.
The glomerulus is a network of tiny blood vessels where pressure filters water and small dissolved substances from the blood.
5. Which hormone helps the body respond quickly to stressful situations?
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Correct Answer: A. Adrenaline
Adrenaline prepares the body for rapid action by increasing heart rate, breathing rate and blood flow to certain muscles.
Adrenaline prepares the body for rapid action by increasing heart rate, breathing rate and blood flow to certain muscles.
6. Which element is the main component of the air we breathe?
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Correct Answer: B. Nitrogen
Nitrogen makes up about 78% of Earth's dry atmosphere, making it the most abundant atmospheric gas.
Nitrogen makes up about 78% of Earth's dry atmosphere, making it the most abundant atmospheric gas.
7. Which chemical substance is commonly added to swimming pools to kill harmful microorganisms?
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Correct Answer: A. Chlorine
Chlorine-based disinfectants are commonly used in swimming pools to reduce harmful microorganisms in the water.
Chlorine-based disinfectants are commonly used in swimming pools to reduce harmful microorganisms in the water.
8. Which gas is needed for aerobic respiration in humans?
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Correct Answer: A. Oxygen
Oxygen is used during aerobic cellular respiration to help release energy from nutrients.
Oxygen is used during aerobic cellular respiration to help release energy from nutrients.
9. Which type of chemical reaction occurs when oxygen combines with a substance and releases heat and often light?
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Correct Answer: A. Combustion
Combustion is a chemical reaction involving a substance and an oxidizer, usually oxygen, that releases energy as heat and often light.
Combustion is a chemical reaction involving a substance and an oxidizer, usually oxygen, that releases energy as heat and often light.
10. Which gas is produced when yeast ferments sugar in bread making?
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Correct Answer: B. Carbon dioxide
Yeast breaks down sugars during fermentation and releases carbon dioxide, which helps bread dough rise.
Yeast breaks down sugars during fermentation and releases carbon dioxide, which helps bread dough rise.
11. Which force allows a person to walk without slipping easily on the ground?
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Correct Answer: A. Friction
Friction between the feet and the ground provides the grip needed to push against the surface and move forward.
Friction between the feet and the ground provides the grip needed to push against the surface and move forward.
12. What happens to the weight of an object if it is taken from Earth to the Moon?
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Correct Answer: B. It becomes less
The Moon's gravitational acceleration is much weaker than Earth's, so an object's weight is lower on the Moon while its mass remains unchanged.
The Moon's gravitational acceleration is much weaker than Earth's, so an object's weight is lower on the Moon while its mass remains unchanged.
13. Which device is used to measure atmospheric pressure?
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Correct Answer: A. Barometer
A barometer measures the pressure exerted by the atmosphere.
A barometer measures the pressure exerted by the atmosphere.
14. Which simple machine is commonly used to raise a bucket from a well?
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Correct Answer: A. Pulley
A pulley changes the direction of the applied force and can make lifting a load, such as a bucket, more convenient.
A pulley changes the direction of the applied force and can make lifting a load, such as a bucket, more convenient.
15. Which natural phenomenon occurs when charged particles from the Sun interact with Earth's upper atmosphere near the poles?
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Correct Answer: A. Aurora
Auroras occur when energetic particles interact with gases in Earth's upper atmosphere, producing colourful displays of light.
Auroras occur when energetic particles interact with gases in Earth's upper atmosphere, producing colourful displays of light.
16. Which imaginary line passes through Greenwich and is used as 0° longitude?
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Correct Answer: B. Prime Meridian
The Prime Meridian is defined as 0° longitude and passes through Greenwich, London.
The Prime Meridian is defined as 0° longitude and passes through Greenwich, London.
17. Which process causes water to move from plant roots toward the leaves through the xylem?
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Correct Answer: A. Transpiration pull
Water loss from leaves creates tension that helps pull water upward through the xylem from the roots.
Water loss from leaves creates tension that helps pull water upward through the xylem from the roots.
18. Which part of a flower develops into the fruit after fertilization?
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Correct Answer: B. Ovary
In flowering plants, the ovary develops into the fruit after fertilization, while the ovules generally develop into seeds.
In flowering plants, the ovary develops into the fruit after fertilization, while the ovules generally develop into seeds.
19. Which layer of Earth's atmosphere contains most of the ozone that protects life from harmful ultraviolet radiation?
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Correct Answer: B. Stratosphere
Most atmospheric ozone is concentrated in the stratosphere, where it absorbs much of the Sun's harmful ultraviolet radiation.
Most atmospheric ozone is concentrated in the stratosphere, where it absorbs much of the Sun's harmful ultraviolet radiation.
20. Which process is responsible for the gradual wearing away and transport of soil and rock by water, wind or ice?
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Correct Answer: A. Erosion
Erosion involves the removal and transport of soil and rock by agents such as flowing water, wind and moving ice.
Erosion involves the removal and transport of soil and rock by agents such as flowing water, wind and moving ice.
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