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
4041
What is 'Friction'?
Answer:
The resistance that one surface or object encounters when moving over another
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
4042
What is a 'Polymer'?
Answer:
A substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together
A polymer is a large molecule, or macromolecule, composed of many repeated subunits.
4043
What is the 'Scientific Method'?
Answer:
A systematic way of learning about the world through observation and experimentation
The scientific method is a method of procedure that has characterized natural science, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
4044
What is an 'Ion'?
Answer:
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons
An ion is an atom or molecule that has a net electrical charge.
4045
What is 'Radiation' (Heat)?
Answer:
Heat transfer through electromagnetic waves
Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it.
4046
What is 'Convection'?
Answer:
Heat transfer caused by the movement of a fluid (liquid or gas)
Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink.
4047
What is 'Conduction' (Heat)?
Answer:
Transfer of heat through direct contact
Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
4048
What is 'Homeostasis'?
Answer:
The tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes
Homeostasis is the state of steady internal, physical, and chemical conditions maintained by living systems.
4049
What is 'Half-life'?
Answer:
The time taken for the radioactivity of a specified isotope to fall to half its original value
Half-life is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics.
4050
What is 'Entropy'?
Answer:
A measure of the disorder or randomness in a closed system
Entropy is a thermodynamic quantity representing the unavailability of a system's thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system.