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
21
Which is NOT a type of galaxy?
Answer:
Cubic
Galaxies are primarily classified by their visual morphology into spiral, elliptical, and irregular shapes. There is no such classification as a 'cubic' galaxy, as gravitational forces pull matter into rounded or disk-like configurations.
22
The Big Bang Theory explains
Answer:
The origin of the Universe
The Big Bang Theory is the prevailing cosmological model for the observable universe. It suggests that the universe began as a very hot, dense point and has been expanding for approximately 13.8 billion years.
23
A black hole has gravity so strong that it can trap
Answer:
Light
A black hole is a region of spacetime where gravity is so intense that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The boundary of the region from which no escape is possible is called the event horizon.
24
Which galaxy is closest to the Milky Way?
Answer:
Andromeda
The Andromeda Galaxy (M31) is the closest large spiral galaxy to the Milky Way, located about 2.5 million light-years away. It is currently moving toward the Milky Way, and the two galaxies are expected to merge in about 4 to 5 billion years.
25
What is a nebula?
Answer:
Cloud of gas and dust
A nebula is a giant cloud of dust and gas in space. Some nebulae come from the gas and dust thrown out by the explosion of a dying star, while others are regions where new stars are beginning to form, often referred to as 'star nurseries'.
26
A supernova is
Answer:
An exploding star
A supernova is the powerful and luminous stellar explosion that occurs during the last evolutionary stages of a massive star. The explosion expels much or all of a star's material at great velocity, creating a shock wave that can trigger the formation of new stars.
27
What is a light-year?
Answer:
Distance light travels in one year
A light-year is a unit of distance, not time. It represents the total distance that light travels in a vacuum in one Julian year (365.25 days), which is approximately 5.88 trillion miles or 9.46 trillion kilometers.
28
What is at the center of most galaxies?
Answer:
Black hole
Most, if not all, massive galaxies are thought to harbor a supermassive black hole at their centers. These incredibly dense objects have a gravitational pull so strong that even light cannot escape, and they play a crucial role in the evolution and structure of the galaxies that surround them.
29
The Milky Way galaxy is classified as
Answer:
Spiral
The Milky Way is a barred spiral galaxy, characterized by a central bar-shaped structure composed of stars, surrounded by a disk of gas, dust, and stars that form distinct spiral arms. Our solar system is located within one of these arms, about 27,000 light-years from the galactic center.
30
What is the largest type of galaxy?
Answer:
Elliptical
Elliptical galaxies are the largest in the universe, ranging from small dwarf ellipticals to giant ones that can contain over a trillion stars and span hundreds of thousands of light-years. Unlike spiral galaxies, they have an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.