General Knowledge MCQs
Topic Notes: General Knowledge
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
4031
What is a 'Variable' in an experiment?
Answer:
Any factor, trait, or condition that can exist in differing amounts or types
A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
4032
What is 'DNA'?
Answer:
Deoxyribonucleic acid
DNA is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms.
4033
What is a 'Black Hole'?
Answer:
A region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
4034
What is the 'Ozone Layer'?
Answer:
A region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation
The ozone layer is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains a high concentration of ozone (O3) in relation to other parts of the atmosphere.
4035
What is 'Erosion'?
Answer:
The process of eroding or being eroded by wind, water, or other natural agents
Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust and then transports it to another location.
4036
What is an 'Enzyme'?
Answer:
A substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction
Enzymes are proteins that act as biological catalysts. Catalysts accelerate chemical reactions.
4037
What is 'Evolution'?
Answer:
The change in the characteristics of a species over several generations
Evolution is the change in the heritable characteristics of biological populations over successive generations.
4038
What is 'Momentum'?
Answer:
The quantity of motion of a moving body, measured as a product of its mass and velocity
Momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.
4039
What is 'Gravity'?
Answer:
A force that attracts a body toward the center of the earth, or toward any other physical body having mass
Gravity is a fundamental interaction which causes mutual attraction between all things that have mass or energy.
4040
What is a 'Vacuum'?
Answer:
A space entirely devoid of matter
A vacuum is a space devoid of matter. The word stems from the Latin adjective vacuus for 'vacant' or 'void'.