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
21
What is a 'Cam'?
Answer:
A rotating mechanical link used to transform rotary motion into linear motion
A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion.
22
What is 'Milling'?
Answer:
The process of machining using rotary cutters to remove material
Milling is the process of machining using rotary cutters to remove material by advancing a cutter into a workpiece.
23
What is 'Lathe'?
Answer:
A machine tool that rotates the workpiece to perform operations like turning, facing, etc.
A lathe is a machine tool that rotates a workpiece about an axis of rotation to perform various operations such as cutting, sanding, knurling, drilling, deformation, facing, and turning.
24
What is 'Soldering'?
Answer:
Joining metals using a filler metal with a melting point below 450°C
Soldering is a process in which two or more items are joined together by melting and putting a filler metal (solder) into the joint, the filler metal having a lower melting point than the adjoining metal.
25
What is 'Welding'?
Answer:
Joining metals by melting the base metal and adding filler
Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion.
26
What is 'Toughness'?
Answer:
The ability of a material to absorb energy and deform without fracturing
Toughness is the ability of a material to absorb energy and plastically deform without fracturing.
27
What is 'Hardness'?
Answer:
Resistance to localized plastic deformation (e.g., indentation or scratching)
Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion.
28
What is 'Malleability'?
Answer:
Ability to be hammered or pressed into thin sheets
Malleability is a material's ability to deform under compressive stress; this is often characterized by the material's ability to form a thin sheet by hammering or rolling.
29
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.
30
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.