Everyday Science MCQs – Set 1
Practice 20 important Everyday Science MCQs covering biology, chemistry, physics, astronomy, the human body and environmental science. Click Show Correct Answer to reveal the answer with a short explanation.
1. What is the basic structural and functional unit of life?
Show Correct Answer
Correct Answer: B. Cell
The cell is considered the basic structural and functional unit of all living organisms.
The cell is considered the basic structural and functional unit of all living organisms.
2. Which organ pumps blood throughout the human body?
Show Correct Answer
Correct Answer: C. Heart
The heart is a muscular organ that pumps blood through the circulatory system.
The heart is a muscular organ that pumps blood through the circulatory system.
3. Which component of blood is mainly responsible for carrying oxygen?
Show Correct Answer
Correct Answer: B. Red blood cells
Red blood cells contain haemoglobin, which binds with oxygen and transports it around the body.
Red blood cells contain haemoglobin, which binds with oxygen and transports it around the body.
4. Which is the largest organ of the human body?
Show Correct Answer
Correct Answer: D. Skin
The skin is the body's largest organ and provides an important protective barrier against the external environment.
The skin is the body's largest organ and provides an important protective barrier against the external environment.
5. Which vitamin is produced in the skin when it is exposed to sunlight?
Show Correct Answer
Correct Answer: D. Vitamin D
Exposure to ultraviolet B radiation from sunlight enables the skin to synthesize vitamin D.
Exposure to ultraviolet B radiation from sunlight enables the skin to synthesize vitamin D.
6. What is the chemical formula of water?
Show Correct Answer
Correct Answer: B. H₂O
A water molecule consists of two hydrogen atoms bonded to one oxygen atom.
A water molecule consists of two hydrogen atoms bonded to one oxygen atom.
7. Which gas is most abundant in Earth's atmosphere?
Show Correct Answer
Correct Answer: C. Nitrogen
Nitrogen makes up approximately 78% of Earth's atmosphere, while oxygen accounts for about 21%.
Nitrogen makes up approximately 78% of Earth's atmosphere, while oxygen accounts for about 21%.
8. Which gas do plants mainly absorb from the atmosphere for photosynthesis?
Show Correct Answer
Correct Answer: B. Carbon dioxide
Plants use carbon dioxide and water during photosynthesis to produce carbohydrates, releasing oxygen as a by-product.
Plants use carbon dioxide and water during photosynthesis to produce carbohydrates, releasing oxygen as a by-product.
9. Which pigment gives green plants their characteristic green colour?
Show Correct Answer
Correct Answer: B. Chlorophyll
Chlorophyll is the green pigment that absorbs light energy used in photosynthesis.
Chlorophyll is the green pigment that absorbs light energy used in photosynthesis.
10. What is the boiling point of pure water at standard atmospheric pressure?
Show Correct Answer
Correct Answer: C. 100°C
Pure water boils at 100°C at standard atmospheric pressure of one atmosphere.
Pure water boils at 100°C at standard atmospheric pressure of one atmosphere.
11. What is the SI unit of force?
Show Correct Answer
Correct Answer: C. Newton
The newton (N) is the SI derived unit used to measure force.
The newton (N) is the SI derived unit used to measure force.
12. What is the SI unit of electric current?
Show Correct Answer
Correct Answer: B. Ampere
The ampere (A) is the SI base unit of electric current.
The ampere (A) is the SI base unit of electric current.
13. Which instrument is used to measure atmospheric pressure?
Show Correct Answer
Correct Answer: C. Barometer
A barometer measures atmospheric pressure and is commonly used in weather observation.
A barometer measures atmospheric pressure and is commonly used in weather observation.
14. Which instrument measures wind speed?
Show Correct Answer
Correct Answer: B. Anemometer
An anemometer is an instrument used in meteorology to measure wind speed.
An anemometer is an instrument used in meteorology to measure wind speed.
15. Sound cannot travel through which of the following?
Show Correct Answer
Correct Answer: D. Vacuum
Sound is a mechanical wave and requires a material medium through which to propagate.
Sound is a mechanical wave and requires a material medium through which to propagate.
16. Which planet is closest to the Sun?
Show Correct Answer
Correct Answer: C. Mercury
Mercury is the innermost planet in the Solar System and therefore the closest planet to the Sun.
Mercury is the innermost planet in the Solar System and therefore the closest planet to the Sun.
17. Which is the largest planet in the Solar System?
Show Correct Answer
Correct Answer: B. Jupiter
Jupiter is the largest planet in the Solar System in both mass and diameter.
Jupiter is the largest planet in the Solar System in both mass and diameter.
18. Which planet is commonly known as the Red Planet?
Show Correct Answer
Correct Answer: A. Mars
Mars appears reddish because iron minerals in its surface material oxidize, or rust.
Mars appears reddish because iron minerals in its surface material oxidize, or rust.
19. Which layer of the atmosphere contains most of Earth's ozone layer?
Show Correct Answer
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 part of the human brain is primarily responsible for balance and coordination?
Show Correct Answer
Correct Answer: B. Cerebellum
The cerebellum plays an important role in balance, posture and the coordination of voluntary movements.
The cerebellum plays an important role in balance, posture and the coordination of voluntary movements.
No comments:
Post a Comment