General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
What is the most abundant element in the universe?
Answer:
Hydrogen
Hydrogen is the most abundant chemical element in the universe, making up roughly 75% of all normal matter. It serves as the primary fuel for stellar nucleosynthesis.
2
Which phenomenon describes the shifting position of stars over centuries?
Answer:
Precession
Precession is the slow, circular wobbling of Earth's axis. It takes about 26,000 years to complete one cycle and causes the positions of stars to shift slowly over long periods of time.
3
What is the “Goldilocks zone”?
Answer:
Region around a star where liquid water is possible
The Goldilocks zone is the range of orbits around a star within which a planetary surface can support liquid water. It is neither too hot nor too cold for life as we know it.
4
The Earth's nearest star is
Answer:
Sun
While Proxima Centauri is the closest star outside our Solar System, the Sun is officially the star closest to Earth, providing the energy that support all life on our planet.
5
What do we call planets outside our solar system?
Answer:
Exoplanets
Planets that orbit stars other than our Sun are called exoplanets (extra-solar planets). Thousands have been discovered, ranging from rocky Earth-sized worlds to massive gas giants.
6
Which star is closest to our Solar System?
Answer:
Proxima Centauri
Proxima Centauri is a small star located about 4.24 light-years from the Sun. It is part of the Alpha Centauri star system and is the closest known star to our Solar System.
7
What type of galaxy is the Andromeda galaxy?
Answer:
Spiral
The Andromeda Galaxy is a large spiral galaxy, similar in structure to our own Milky Way. It has a central bulge of old stars and a disk of younger stars arranged in spiral arms.
8
What are binary stars?
Answer:
Two stars orbiting a common center
A binary star is a system of two stars in which one revolves around the other or both revolve around a common center. Binary systems are extremely common in the observable universe.
9
Which color are the hottest stars?
Answer:
Blue-white
In astronomy, the color of a star indicates its surface temperature. Blue and blue-white stars are the hottest, with temperatures exceeding 30,000 Kelvin, while red stars are the coolest.
10
The Milky Way’s central black hole is called
Answer:
Sagittarius A*
Sagittarius A* is the supermassive black hole located at the galactic center of the Milky Way. It is a bright radio source and has a mass approximately 4 million times that of our Sun.