General Science Topics
Undergraduate level — General Science
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quiz Questions
Q91
An incandescent light bulb is filled with an inert gas like Argon at low pressure. What is the primary physical reason for this structural implementation?
To increase the localized gravitational potential barrier
To prevent filament oxidation and suppress thermal evaporation
To maximize the internal glass surface wetting angle
To neutralize the electromagnetic field emitted by the circuit
Explanation
Filling the bulb with an inert gas like argon prevents the oxidation of the hot tungsten filament and significantly reduces its evaporation rate, thereby prolonging the lifespan of the bulb.
Q92
Which of the following elements has the highest electrical conductivity value under standard temperature and pressure conditions?
Copper
Silver
Gold
Aluminium
Explanation
Silver possesses the highest electrical conductivity of all metals because it contains a higher density of free electrons that can move with minimal structural resistance.
Q93
The process of pasteurization involves heating milk to a specific temperature for a brief period to primarily eliminate which type of biological agents?
All beneficial fungal endospores altogether
Pathogenic, heat-sensitive bacteria
Sub-surface complex plant cellulose fibres
Heavy metal particulate precipitates completely
Explanation
Pasteurization utilizes controlled thermal exposure to destroy pathogenic bacteria like Mycobacterium and Salmonella without completely sterilizing the fluid or destroying nutritional proteins.
Q94
Which of the following organic polymers is the primary structural component of the exoskeleton found in insects and crustaceans?
Cellulose
Chitin
Glycogen
Keratin
Explanation
Chitin is a tough, nitrogen-containing polysaccharide polymer that forms the robust structural layout of arthropod exoskeletons and fungal cell walls.
Q95
What type of artificial intelligence infrastructure simulates neurons mathematically to execute complex deep learning algorithms?
Linear Database Indexing Matrix
Artificial Neural Network (ANN)
Binary Logic Sorting Tree
Analog Voltage Regulator Layout
Explanation
Artificial Neural Networks (ANNs) consist of interconnected nodes or layers that model the structural behavior of biological neurons to identify data patterns via matrix operations.
Q96
The concept of 'Keystone Species' in an ecological community refers to which type of biological organism?
The single most abundant primary producer in a biome
A species that exerts a disproportionately large impact on its community structure
An exotic invasive species that triggers ecosystem collapse
A migratory bird that utilizes multiple food webs seasonwise
Explanation
A keystone species is one whose presence exerts a disproportionately massive structural impact on maintaining the stability and diversity of its entire ecosystem relative to its abundance.
Q97
Which chemical compound undergoes thermal decomposition to release oxygen gas inside oxygen candles used in emergency submarines?
Ammonium Nitrate
Sodium Chlorate
Calcium Sulphate
Potassium Carbonate
Explanation
Oxygen candles utilize Sodium Chlorate (NaClO3) mixed with iron powder. When ignited, the thermal decomposition releases pure chlorate-derived oxygen gas.
Q98
What type of optical fiber structure limits modal dispersion completely by channeling light through a microscopic core down a single path?
Multi-mode Step Index Fiber
Single-mode Fiber
Multi-mode Graded Index Panel
Asymmetric Coaxial Cooper Waveguide
Explanation
Single-mode optical fibers feature a very narrow core diameter (around 8-10 micrometers) that permits only a single spatial mode of light to propagate, eliminating intermodal dispersion over long distances.
Q99
An elevator cable is tensioned to accelerate an 80 kg passenger upwards. If the elevator accelerates at 2 m/s², what is the apparent weight experienced by the passenger? (Take g = 10 m/s²)
640 N
800 N
960 N
1120 N
Explanation
When an elevator accelerates upwards, the apparent weight (Normal reaction N) is given by N = m(g + a). Substituting the values: N = 80(10 + 2) = 80 × 12 = 960 Newtons.
Q100
Which of the following hydrocarbon compounds belongs to the homologous series of Alkynes and contains a triple covalent bond?
Methane (CH4)
Ethene (C2H4)
Ethyne (C2H2)
Propane (C3H8)
Explanation
Alkynes follow the general molecular formula CnH2n-2. Ethyne (Acetylene) with the formula C2H2 is the simplest member of this group, featuring a carbon-carbon triple bond.