General Science Topics
Undergraduate level — General Science
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quiz Questions
Q81
What is the primary chemical component of CNG (Compressed Natural Gas)?
Butane
Methane
Propane
Ethane
Explanation
CNG is composed mainly of methane (CH4), typically accounting for 80% to 95% of its total composition, making it a relatively clean-burning alternative fuel.
Q82
Which type of blood cells are predominantly responsible for generating a humoral immune response through the secretion of specific antibodies?
T-lymphocytes
B-lymphocytes
Eosinophils
Thrombocytes
Explanation
B-lymphocytes (or B cells) mature into plasma cells that synthesize and release highly specific antibodies to neutralize circulating pathogens like bacteria and viruses.
Q83
An astronomical telescope uses two convex lenses. To increase its magnifying power in normal adjustment, which structural modification should be performed?
Increase the focal length of the eyepiece
Decrease the focal length of the eyepiece
Decrease the focal length of the objective lens
Decrease the aperture size of the objective lens
Explanation
The magnifying power of an astronomical telescope in normal adjustment is given by m = fo / fe. Therefore, to increase magnification, the focal length of the objective lens (fo) should be increased, or the focal length of the eyepiece (fe) should be decreased.
Q84
Which chemical compound is used as a primary electrolyte inside the standard dry cell (Leclanché cell) commonly used in household remotes?
Potassium Hydroxide
Ammonium Chloride
Dilute Sulphuric Acid
Copper Sulphate
Explanation
A standard dry cell utilizes a moist paste of Ammonium Chloride (NH4Cl) and Zinc Chloride (ZnCl2) as the electrolyte, with Manganese Dioxide (MnO2) acting as a depolarizer around the carbon rod.
Q85
Which of the following cellular diseases is caused by a numerical chromosomal aberration specifically known as Trisomy 21?
Turner Syndrome
Down Syndrome
Klinefelter Syndrome
Edward Syndrome
Explanation
Down Syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21, resulting in developmental delays and distinct physical features.
Q86
The core technology utilized in supercomputers to process massive numerical datasets simultaneously across multiple nodes is known by what expression?
Sequential Batch Execution
Massively Parallel Processing
Single Core Virtualization
Asynchronous Analog Multiplexing
Explanation
Massively Parallel Processing (MPP) involves the coordinated processing of a program by multiple processors that each work on different parts of the program, utilizing their own operating system and memory.
Q87
Which graphic parameter describes the total variety and abundance of different biological species present within a single local habitat ecosystem?
Beta Diversity
Alpha Diversity
Gamma Diversity
Trophic Delta Core
Explanation
Alpha diversity refers to the local diversity within a single uniform ecosystem or habitat, measuring species richness (the number of species) and evenness.
Q88
The critical velocity of an ideal fluid flowing through a narrow cylindrical channel drops sharply if which variable increases?
Coefficient of Viscosity
Diameter of the channel
Atmospheric pressure head
Surface wetting angle
Explanation
According to Reynolds number considerations, the critical velocity (vc) of a fluid is inversely proportional to the diameter of the channel and density of the fluid (vc = Rη / ρD). Hence, increasing the diameter reduces critical velocity.
Q89
Which of the following statements accurately characterizes the chemical behavior of an amphoteric oxide?
It reacts exclusively with strong inorganic acids
It reacts with both acids and bases to yield salt and water
It completely dissolves in pure water to yield a neutral solution
It undergoes instantaneous sublimation under standard pressure
Explanation
Amphoteric oxides are metal oxides that react chemically with both acids and bases to produce salts and water. Examples include Aluminium Oxide (Al2O3) and Zinc Oxide (ZnO).
Q90
The process of nitrogen fixation in the root nodules of leguminous plants is chemically catalyzed by which specialized enzyme?
Amylase
Nitrogenase
Peptidase
Cellulase
Explanation
The conversion of atmospheric nitrogen (N2) into ammonia (NH3) inside the root nodules is driven by the Nitrogenase enzyme complex, which operates exclusively under anaerobic conditions.