Everyday Science MCQs – Set 5
Practice 20 important Everyday Science MCQs covering biology, chemistry, physics, human body, earth science, astronomy and environmental science. Click Show Correct Answer to reveal the answer with a short explanation.
1. Which part of the human skeleton protects the brain?
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Correct Answer: C. Skull
The skull is a hard bony structure that surrounds and protects the brain from physical injury.
The skull is a hard bony structure that surrounds and protects the brain from physical injury.
2. Which type of joint is found between the bones of the skull?
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Correct Answer: D. Fixed joint
Most bones of the skull are joined by immovable joints called sutures, which provide protection for the brain.
Most bones of the skull are joined by immovable joints called sutures, which provide protection for the brain.
3. Which muscle is primarily responsible for breathing by changing the volume of the chest cavity?
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Correct Answer: B. Diaphragm
The diaphragm contracts and relaxes to change the volume of the chest cavity, helping air move into and out of the lungs.
The diaphragm contracts and relaxes to change the volume of the chest cavity, helping air move into and out of the lungs.
4. Which organ stores bile produced by the liver?
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Correct Answer: B. Gallbladder
The gallbladder stores and concentrates bile, which is produced by the liver and released into the small intestine during digestion.
The gallbladder stores and concentrates bile, which is produced by the liver and released into the small intestine during digestion.
5. Which enzyme in saliva begins the digestion of starch?
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Correct Answer: C. Amylase
Salivary amylase begins breaking down starch into smaller carbohydrate molecules during chewing.
Salivary amylase begins breaking down starch into smaller carbohydrate molecules during chewing.
6. Which element is the main component of diamond and graphite?
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Correct Answer: B. Carbon
Diamond and graphite are different forms, or allotropes, of the element carbon.
Diamond and graphite are different forms, or allotropes, of the element carbon.
7. Which chemical element has the symbol Fe?
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Correct Answer: B. Iron
The symbol Fe comes from the Latin word "ferrum," which means iron.
The symbol Fe comes from the Latin word "ferrum," which means iron.
8. Which process occurs when a solid changes directly into a gas?
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Correct Answer: B. Sublimation
Sublimation is the direct change of a substance from a solid state to a gas without passing through the liquid state.
Sublimation is the direct change of a substance from a solid state to a gas without passing through the liquid state.
9. Which gas is commonly produced when an acid reacts with a carbonate?
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Correct Answer: C. Carbon dioxide
Acids react with carbonates to produce a salt, water and carbon dioxide gas.
Acids react with carbonates to produce a salt, water and carbon dioxide gas.
10. Which material is commonly used as an electrical insulator around wires?
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Correct Answer: C. Rubber
Rubber has high electrical resistance and is commonly used to insulate electrical wires and protect users from electric shock.
Rubber has high electrical resistance and is commonly used to insulate electrical wires and protect users from electric shock.
11. Which form of energy is stored in a stretched rubber band?
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Correct Answer: B. Elastic potential energy
A stretched or compressed elastic object stores elastic potential energy that can be released when the object returns toward its original shape.
A stretched or compressed elastic object stores elastic potential energy that can be released when the object returns toward its original shape.
12. Which instrument is used to measure electric potential difference?
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Correct Answer: B. Voltmeter
A voltmeter measures the potential difference, or voltage, between two points in an electrical circuit.
A voltmeter measures the potential difference, or voltage, between two points in an electrical circuit.
13. Which type of wave is used in television remote controls?
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Correct Answer: A. Infrared wave
Most conventional television remote controls transmit signals using infrared light.
Most conventional television remote controls transmit signals using infrared light.
14. Which colour of visible light has the shortest wavelength?
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Correct Answer: D. Violet
Violet light has the shortest wavelength and the highest frequency among the main colours of visible light.
Violet light has the shortest wavelength and the highest frequency among the main colours of visible light.
15. Which natural phenomenon is mainly responsible for producing tides on Earth?
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Correct Answer: B. The gravitational pull of the Moon and Sun
Tides are caused mainly by the gravitational forces of the Moon and, to a lesser extent, the Sun acting on Earth's oceans.
Tides are caused mainly by the gravitational forces of the Moon and, to a lesser extent, the Sun acting on Earth's oceans.
16. Which instrument is used to measure humidity in the atmosphere?
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Correct Answer: A. Hygrometer
A hygrometer is used to measure the amount of moisture or humidity present in the air.
A hygrometer is used to measure the amount of moisture or humidity present in the air.
17. Which planet rotates on its axis in the opposite direction to most planets?
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Correct Answer: A. Venus
Venus has retrograde rotation, meaning it rotates in the opposite direction to most planets in the Solar System.
Venus has retrograde rotation, meaning it rotates in the opposite direction to most planets in the Solar System.
18. What is the name of the path followed by a planet around the Sun?
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Correct Answer: B. Orbit
An orbit is the curved path followed by an astronomical object as it moves around another object under gravity.
An orbit is the curved path followed by an astronomical object as it moves around another object under gravity.
19. Which process converts nitrogen gas from the atmosphere into forms that plants can use?
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Correct Answer: A. Nitrogen fixation
Nitrogen fixation converts atmospheric nitrogen into nitrogen-containing compounds that can enter the nitrogen cycle and become available to plants.
Nitrogen fixation converts atmospheric nitrogen into nitrogen-containing compounds that can enter the nitrogen cycle and become available to plants.
20. Which layer of the atmosphere is closest to Earth's surface?
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Correct Answer: C. Troposphere
The troposphere is the lowest layer of Earth's atmosphere and is where most weather and clouds occur.
The troposphere is the lowest layer of Earth's atmosphere and is where most weather and clouds occur.
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