1
Who developed the theory of relativity?
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.
2
Which is the hardest natural substance on Earth?
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.
3
The process by which plants make food using sunlight is called:
๐ก Explanation
Photosynthesis is the process by which green plants use sunlight, water, and carbon dioxide to produce oxygen and glucose (food).
4
Which gas is most abundant in the Earth's atmosphere?
๐ก Explanation
Nitrogen (Nโ) makes up about 78% of the Earth's atmosphere. Oxygen is second at about 21%.
5
The unit of electrical resistance is:
๐ก Explanation
The SI unit of electrical resistance is the Ohm (ฮฉ), named after physicist Georg Simon Ohm who formulated Ohm's Law.
6
The speed of light in vacuum is approximately:
๐ก Explanation
The speed of light in vacuum (c) is approximately 3 ร 10โธ metres per second, or about 300,000 km/s.
7
Which planet is known as the "Red Planet"?
๐ก Explanation
Mars is called the "Red Planet" because of the reddish iron oxide (rust) on its surface, giving it a distinctive red appearance.
8
What is the chemical formula of water?
๐ก Explanation
Water (HโO) consists of two hydrogen atoms and one oxygen atom. HโOโ is hydrogen peroxide.
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