1
What is the chemical formula of water?
A
HO B
H2O C
H3O D
H2O2 ๐ก Explanation
Water (HโO) consists of two hydrogen atoms and one oxygen atom. HโOโ is hydrogen peroxide.
2
Which planet is known as the "Red Planet"?
A
Jupiter B
Saturn C
Mars D
Venus ๐ก Explanation
Mars is called the "Red Planet" because of the reddish iron oxide (rust) on its surface, giving it a distinctive red appearance.
3
The speed of light in vacuum is approximately:
A
3 ร 10โถ m/s B
3 ร 10โธ m/s C
3 ร 10ยนโฐ m/s D
3 ร 10โด m/s ๐ก Explanation
The speed of light in vacuum (c) is approximately 3 ร 10โธ metres per second, or about 300,000 km/s.
4
The unit of electrical resistance is:
A
Volt B
Ampere C
Watt D
Ohm ๐ก Explanation
The SI unit of electrical resistance is the Ohm (ฮฉ), named after physicist Georg Simon Ohm who formulated Ohm's Law.
5
Which gas is most abundant in the Earth's atmosphere?
A
Oxygen B
Carbon Dioxide C
Nitrogen D
Argon ๐ก Explanation
Nitrogen (Nโ) makes up about 78% of the Earth's atmosphere. Oxygen is second at about 21%.
6
The process by which plants make food using sunlight is called:
A
Respiration B
Photosynthesis C
Transpiration D
Fermentation ๐ก Explanation
Photosynthesis is the process by which green plants use sunlight, water, and carbon dioxide to produce oxygen and glucose (food).
7
Which is the hardest natural substance on Earth?
A
Gold B
Iron C
Diamond D
Quartz ๐ก Explanation
Diamond is the hardest natural substance, rating 10 on the Mohs hardness scale. It is a form of carbon with atoms arranged in a crystal structure.
8
Who developed the theory of relativity?
A
Isaac Newton B
Albert Einstein C
Niels Bohr D
Max Planck ๐ก Explanation
Albert Einstein developed the Special Theory of Relativity (1905) and the General Theory of Relativity (1915), revolutionizing our understanding of space, time, and gravity.
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