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
3881
What is the 'Otto Cycle' used for?
Answer:
Petrol (Spark Ignition) Engines
The Otto cycle is the idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine (Petrol engine).
3882
What does Bernoulli's Principle state?
Answer:
An increase in the speed of a fluid occurs simultaneously with a decrease in static pressure
Bernoulli's principle states that for an inviscid flow of a non-conducting fluid, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
3883
What does the 'Reynolds Number' determine?
Answer:
Whether flow is laminar or turbulent
The Reynolds number is a dimensionless quantity used to predict flow patterns in different fluid flow situations (Laminar vs. Turbulent).
3884
What is 'Poisson's Ratio'?
Answer:
Ratio of lateral strain to longitudinal strain
Poisson's ratio is the negative ratio of transverse (lateral) strain to axial (longitudinal) strain.
3885
What is 'Young's Modulus'?
Answer:
Ratio of tensile stress to tensile strain
Young's Modulus (or Modulus of Elasticity) is a measure of the stiffness of a solid material, defined as the ratio of tensile stress to tensile strain.
3886
What does Hooke's Law state?
Answer:
Stress is directly proportional to Strain within the elastic limit
Hooke's Law states that for small deformations, the stress is directly proportional to the strain.
3887
What is 'Strain'?
Answer:
Deformation per unit length
Strain is the ratio of the change in dimension (deformation) to the original dimension of the material.
3888
What is 'Stress' in mechanics of materials?
Answer:
Force per unit area
Stress is defined as the internal restoring force per unit area of cross-section of the body.
3889
What does the Second Law of Thermodynamics state about entropy?
Answer:
Entropy of an isolated system always increases over time
The Second Law states that the total entropy of an isolated system can never decrease over time, implying that natural processes are irreversible.
3890
What is the First Law of Thermodynamics primarily concerned with?
Answer:
Conservation of Energy
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed. It is the law of conservation of energy applied to thermal systems.