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
3871
What is 'Brittleness'?
Answer:
Tendency to break without significant plastic deformation
Brittleness describes the property of a material that fractures when subjected to stress but has a little tendency to deform before rupture.
3872
What is 'Ductility'?
Answer:
Ability to deform under tensile stress (stretch into a wire)
Ductility is a measure of a material's ability to undergo significant plastic deformation before rupture, typically expressed as percent elongation.
3873
What is 'Fatigue' in materials?
Answer:
Failure under repeated or fluctuating stresses
Fatigue is the weakening of a material caused by repeatedly applied loads. It is the progressive and localized structural damage that occurs when a material is subjected to cyclic loading.
3874
What is 'Creep' in materials?
Answer:
Slow, permanent deformation under the influence of constant stress over time
Creep is the tendency of a solid material to move slowly or deform permanently under the influence of mechanical stresses, typically at high temperatures.
3875
What is 'Pascal's Law'?
Answer:
Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid
Pascal's law states that a change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid.
3876
What is the function of a 'Governor'?
Answer:
To regulate the mean speed of an engine
A governor is a device used to measure and regulate the speed of a machine, such as an engine.
3877
What is a 'Flywheel'?
Answer:
A heavy wheel used to store rotational energy and smooth out engine fluctuations
A flywheel is a mechanical device specifically designed to efficiently store rotational energy to smooth the delivery of power from a motor.
3878
What is the function of a 'Bearing'?
Answer:
To reduce friction between moving parts and support loads
A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.
3879
What is a 'Gear'?
Answer:
A rotating machine part having cut teeth which mesh with another toothed part to transmit torque
A gear is a rotating circular machine part having cut teeth which mesh with another toothed part to transmit torque and speed.
3880
What is the 'Diesel Cycle'?
Answer:
Constant pressure heat addition
The Diesel cycle is the thermodynamic cycle for diesel engines, characterized by heat addition at constant pressure.