About the Work
George is a Bengali-language educational work attributed to Angela Davis, built around a core text and an extensive apparatus of study material. The edition examined here presents itself as a compilation: alongside explanatory prose, it contains hundreds of multiple-choice questions with worked solutions, short definitional notes, matching exercises, tables of scientific data, and mathematical problems. The instructional language is Bengali, with a large technical vocabulary retained in English — chemical formulae, biological terms, physical units, names of scientists, and the like — so that the book reads as a bilingual resource for students preparing for examinations.
The subject matter is broad rather than narrow. The book moves across chemistry, physics, biology, astronomy, and general science, and it does so in a way that suggests a survey or revision text rather than a single-subject treatise. Its chemistry content ranges from atomic structure and the periodic table to alloys, ores, and organic compounds; its physics content covers electricity, resistance, transformers, radioactivity, and energy sources; its biology content spans cell structure, genetics, taxonomy, microbiology, and the history of the discipline; and its later sections turn to planetary astronomy, eclipses, space agencies, and the history of spaceflight.
Because the surviving notes are drawn from a garbled and partially reconstructed text, the book’s precise publication history cannot be stated with confidence. What can be said is that it belongs to the genre of South Asian examination-preparation literature, in which a main text is surrounded by question banks keyed to the admission tests and recruitment examinations of banks, universities, and public institutions. The questions in this edition are attributed to bodies such as Jahangirnagar University, Bangladesh Bank, Agrani Bank, Janata Bank, IFIC Bank, Premier Bank, and others, which places the book’s use firmly within the competitive-examination culture of Bangladesh.
Context
The book belongs to a distinctive educational tradition. In Bangladesh and neighbouring regions, the market for examination guides is vast, and successful guides are often organized around a named author or brand whose material is repeatedly revised, expanded, and reprinted. The present edition carries the label “George’s MP3,” a designation that functions as a series or brand marker rather than a description of the contents. The presence of this label, together with the dense apparatus of MCQ solutions, indicates that the book is designed less for sequential reading than for drilling, revision, and self-testing.
The questions themselves preserve traces of the world they were written for. They cite specific recruitment examinations — “Bangladesh Krishi Bank Officer (Cash): 11,” “Janata Bank Ltd AEO (Teller): 15,” “National Bank Ltd. Probationary Officer: 14,” “IFIC Bank Ltd. Probationary Officer: 96,” “Sbahjalal Islam Bank Ltd. Officer: 03,” “Eastern Bank Ltd. Officer: 05,” “Agrani Bank Ltd Officer,” “Premier Bank Trainee Junior Officer,” “SBL/Malica Officer” — and university admission tests such as “Jahangirnagar University admission test (B2 Unit): 13-14” and “Jahangir nagor university admission test (62 Unit): 13-14.” This citation practice is itself a genre convention: it signals to the student that the material is drawn from real papers and that mastering it has direct practical value.
The intellectual context is likewise revealing. The science content reflects a standard school and college syllabus — the 2n² rule for electron capacity, the distinction between isotopes, isobars, and isotones, Ohm’s law, the structure of the cell, the laws of Mendelian genetics, the classification of living things. But the book also reaches into the history of science and into general knowledge: Aristotle and Theophrastus, Ibn Sina and Al Biruni, William Harvey and Alexander Fleming, Darwin and Linnaeus, Einstein and Newton’s heirs, Yuri Gagarin and Neil Armstrong. The result is a text that treats science simultaneously as a body of laws to be memorized and as a human story to be recounted.
Structure of the Book
The book does not follow a single narrative line. It is organized as a sequence of topic-based sections, each combining explanatory notes with question-and-answer material, and the topics are grouped by discipline. The opening sections are chemical: atomic structure and electronic configuration, atomic number and mass number, isotopes, isobars, and isotones, metals and non-metals, alloys, ores and minerals, common compounds, galvanizing, carbon and its compounds, and periodic trends. From there the book moves into organic chemistry — the definition of organic compounds, hydrocarbons such as methane, ethane, and propane, functional groups, esters, soaps, and industrial substances like polythene, TNT, and DDT — before turning to physics.
The physics sections cover semiconductors and conductors, the heating effect of current, lightning and electrical discharge, resistance and Ohm’s law, electrical energy and power, circuits, fuses, and circuit breakers, worked numerical problems, transformers, X-rays, radioactivity, and the classification of energy sources into renewable and non-renewable. A substantial block of material is devoted to fossil fuels, natural gas, relativity, and nuclear energy, including fusion, fission, and the reactor.
Biology occupies a large middle portion of the book. It opens with the development of biology as a discipline — Aristotle, Theophrastus, Al Biruni, Ibn Sina, An Nafis, Harvey, Fleming, David Prain, and Salim Ali — and with the branches of biology, from morphology and anatomy to ecology, taxonomy, and the specialized “-ologies” such as herpetology, ornithology, and ichthyology. From there the book proceeds to cell biology, cell division, tissues, genetics, chromosomes, and nucleic acids; to plant nutrition, pollination, and animal diversity; to living fossils and microbiology, including viruses and the diseases they cause; and to contagious diseases and their incubation periods.
The final sections turn outward to astronomy and space. They cover planetary facts, eclipses, space agencies such as NASA and the European Space Agency, the first satellites and spacecraft, human spaceflight, the International Space Station, the Hubble Space Telescope, and the motions of the earth — diurnal and annual — with their effects on day and night, seasons, tides, and winds. The book thus ends not with a conclusion but with a body of astronomical and geographical data, closing on questions about the earth’s motion and the longest day of the year.
Inside the Book
Atomic Structure and Electronic Configuration
The instructional material opens with the fundamental rules governing how electrons occupy the shells around an atomic nucleus. The maximum number of electrons a shell can hold is given by the formula 2n², where n represents the shell number. Working through the values, the first shell holds 2 electrons, the second holds 8, the third holds 18, and the fourth holds 32. A multiple-choice question tests this formula directly, offering n², 2n², 3n², and 4n³ as options; the correct answer is 2n².
Atomic Number, Mass Number, and the Families of Nuclides
The text then defines atomic number as the count of protons in an atom’s nucleus, and mass number (A) as the sum of protons (p) and neutrons (N), expressed as A = p + N. A question testing this relationship offers several arrangements, with A = P + N confirmed as correct.
From there the material distinguishes three related categories of atoms. Isotopes are atoms of the same element sharing an atomic number but differing in mass number; hydrogen’s three isotopes are Protium (¹H), Deuterium (²H), and Tritium (³H), while uranium’s include ²³⁴U, ²³⁵U, and ²³⁸U. Isobars are atoms of different elements with the same mass number but different atomic numbers — ⁶⁴Cu (atomic number 29) and ⁶⁴Zn (atomic number 30), for instance, where copper has 29 neutrons and zinc has 30. Isotones, finally, are atoms with equal neutron counts but different mass numbers, illustrated by ³¹P, ³²S, and ³⁰Si, each containing 16 neutrons.
Metals, Non-Metals, and Alloys
The passage catalogues metals including lithium, potassium, platinum, zinc, copper, and mercury, noting that mercury alone is liquid at room temperature, and touches on non-metallic materials as well. It then turns to alloys: steel is iron combined with 0.1–1.5% carbon; stainless steel adds chromium and nickel to that mix; bronze is roughly 90% copper and 10% tin; brass is copper and zinc; and gun metal combines copper, tin, and zinc.
Ores, Minerals, and Common Compounds
A survey of ores follows. Copper ore is chalcopyrite, iron ore is haematite, and bauxite is the aluminium ore. Galena (PbS) supplies lead, zinc blende (ZnS) supplies zinc, and various carbonate and sulphate minerals are also listed. Among common compounds, common salt is sodium chloride (NaCl), soda-lime is NaOH·CaO, FeSO₄·7H₂O is green vitriol (Mohr’s salt), Pb₃O₄ is red in colour, and the alum used to purify water consists of potassium sulphate and aluminium sulphate. Galvanizing — protecting iron from corrosion — proceeds through surface preparation, pickling, a flux solution, coating, rinsing, and a final zinc bath.
Carbon and Its Compounds
Carbon appears in several forms, including diamond, graphite, and fullerene. Dry ice is solid CO₂, and the section discusses carbon monoxide and carbon dioxide along with their properties. Periodic trends also surface, with questions about metallic character noting an ordering of Al < Ga < In < Si in a given context.
Organic Chemistry: Hydrocarbons and Functional Groups
The organic chemistry material defines organic compounds and exemplifies them with methane (CH₄), ethane (C₂H₆), and propane (C₃H₈). A question drawn from a Jahangirnagar University admission test asks what LPG mainly consists of, offering combinations of methane, butane, propane, gobar gas, and water gas. Another asks the general formula of the aromatic series, with CnH₂n₋₂, CnH₂n₊₂, CnH₂n₋₆, and “None” as options. Functional groups are listed with explanations: aldehyde (–CHO), alcohol (C₂H₅OH) with its –OH group, and ether (R–O–R′). Esters are noted as COOR, where the two R groups may be the same or different.
Polymers, Soaps, and Industrial Products
A question attributed to a Bangladesh Krishi Bank officer exam asks what polythene is industrially prepared by polymerizing, with ethylene confirmed as the answer; acetylene (C₂H₂) also appears. A reaction is given in which CHCl₃ combines with HNO₃ to yield Cl₃CNO₂ (chloropicrin) plus water, and a question follows about that product. Soap is defined as a sodium or potassium salt of higher fatty acids, with sodium stearate (C₁₇H₃₅COONa) and sodium palmitate as examples; toothpaste is mentioned as containing soap-like substances in certain percentages. Sodium acetate (CH₃COONa) recurs, including in equations involving CH₃COOSi. TNT is identified as 2,4,6-trinitrotoluene, and DDT is mentioned. Paint is described as a mixture and thinner as a volatile liquid, with a note stressing that the two are not the same. A question asks which is not a natural fibre, offering Acryl, jute, cotton, and wool.
Measuring Instruments and Their Inventors
The physics material quizzes the functions of various instruments: a barometer, lactometer, phonograph, and odometer; a manometer, which measures pressure difference; and a fathometer, which measures ocean depth, a question drawn from Janata Bank and National Bank exams. Several invention questions follow, attributed to IFIC: the steam railway engine (George Stephenson), the helicopter (Igor Sikorski), and the refrigerator (James Harrison). Questions also touch on the atom bomb and the polygraph. Portland cement’s main raw materials are tested, with limestone and clay as the correct pairing. A list of measurement instruments and their uses — atmospheric pressure, humidity, specific gravity, and others — rounds out the section.
Semiconductors, Ohm’s Law, and Electric Power
A table lists silicon and germanium as semiconductors. Questions ask which substance is not a conductor of electricity (glass among the options) and which is the best conductor (sea water), one drawn from a Jahangirnagar University admission test. The heating effect of current is noted, with a Bangladesh Bank question asking which appliance illustrates it — the toaster. Lightning and electrical discharge phenomena are described. Resistance is defined and measured in ohms, Ohm’s Law is stated as V = IR, and the laws of resistance are presented. A formula box gives power relationships: P = VI, P = I²R, and P = V²/R.
Electrical Energy, Circuits, and Worked Problems
Electric energy is discussed in units of watts and kilowatt-hours, with 1 kW·h equal to 3.6 × 10⁶ joules. Electric bills are calculated in kilowatt-hours, a question attributed to an Agrani Bank officer exam. Series and parallel circuits are described, along with the fuse and circuit breaker that protect circuits from excess current. Worked problems compute energy using W = Pt: 100 W for 60 s gives 6000 J; 40 W for 600 s gives 24,000 J; 400 W for 5 hours (18,000 s) gives 7,200,000 J, or 2 kWh. A problem with V = 200 V and P = 40 W solves R = V²/P = 1000 Ω. The transformer is defined, with voltage as what it transforms, and UPS is expanded as Uninterruptible Power Supply.
X-rays, Radioactivity, and Sources of Energy
Modern physics covers X-ray production and radioactivity, whose SI unit is the becquerel (Bq). Radioactive isotopes include carbon-14, used in archaeology, and uranium-238, with a half-life of 4,510,000,000 years. Alpha, beta, and gamma rays are distinguished. Natural resources are classified as renewable (solar, wind, sea current, atomic energy) and non-renewable. Solar cells use cadmium, and solar power plants, tunnels, and hydroelectricity are mentioned. A question asks which is a renewable energy source.
Energy Questions and Fossil Fuels
Further questions follow: wind as a renewable source; none among gas, coal, petroleum, and diesel oil qualifying as renewable; the sun’s energy arising from nuclear fusion; the world’s largest solar power plant located in the USA; solar energy converted to electricity via photovoltaic cells; and the world’s first solar-powered railway tunnel, in Belgium. A hydroelectricity question appears as well. The notes explain that non-renewable energy comprises fossil fuels — coal, petroleum, natural gas — formed from buried plants and animals over long periods, releasing carbon and harming the environment. A Premier Bank question asks which is a fossil derivative, with methane as the answer. Coal’s rank shifts with volatile and carbon content; natural gas is mainly methane, with sulphur its most undesirable element; CNG stands for Compressed Natural Gas. A question likens gasoline and the automobile to food and the body, petrol is named the “greenest” fuel, and butane is identified as gaseous at NTP.
Relativity, Nuclear Energy, and the Development of Biology
Einstein is credited with the Theory of Relativity and E = mc², with Prof. M. N. Bosh mentioned in connection with relativity discussion. Questions confirm that Einstein discovered the law of relativity and was born in Germany. Nuclear energy is explained as arising from the atomic nucleus through fusion and fission — fusion involving tritium and a neutron, fission involving uranium — and the nuclear reactor is described. Uranium is identified as the material used to produce nuclear energy, and a nuclear power station is located in the USA.
The final stretch turns to biology’s development. Aristotle wrote Historia Animalium; Theophrastus classified plants into trees, shrubs, undershrubs, and herbs and wrote On the History of Plants and On the Causes of Plants; Al Biruni and Ibn Sina contributed to biology and medicine; An Nafis described blood circulation; William Harvey wrote On the Motion of the Heart and Blood in Animals; Alexander Fleming discovered penicillin in 1928; David Prain wrote Bengal Plants and Flora of Sundribans; and Salim Ali, “The Birdman of India,” wrote The Indian Birds. A table catalogues the branches of biology — morphology, anatomy, physiology, embryology, genetics, cytology, histology, ecology, evolution, taxonomy, toxicology, herpetology, ornithology, palynology, paleontology, geology, ichthyology, entomology, microbiology, virology, bacteriology, faicology, mycology, parasitology, helminthology, and anthropology — noting that anatomy deals with the structure of animals and plants. The complex web linking animals, plants, and every other life form in the biosphere is called the natural system, and ecology is identified as most used in the field of the environment.
Entomology, Pisciculture, and the “-Culture” Vocabularies
The appended study material opens with definitional items that anchor the reader in the vocabulary of the life sciences. Entomology, the first entry establishes, is the study of insects, set apart from the study of plants and animals as the wrong alternatives. From there the guide moves through a cluster of questions about which discipline corresponds to pisciculture, offering apiculture, aviculture, pisciculture itself, and prawn culture as the candidate answers. The text then lays out a long bilingual glossary of cultivation and husbandry terms, pairing each English word with its Bengali equivalent: apiculture for bee-keeping, aviculture, pisciculture for fish culture, prawn culture, pearl culture, frog culture, animal husbandry, poultry farming, horticulture, sericulture, and lac culture. A question follows asking what lac culture is concerned with, listing the silk worm, the bee, and other options among the choices.
Medical Sciences and Their Bengali Equivalents
A second vocabulary set turns to the medical sciences, again presented with Bengali glosses. Medical science stands at the head, followed by osteology, ophthalmology, oncology, paediatrics, psychology, neurology, dermatology, and radiology. The accompanying question asks what paediatrics relates to, with children as the correct answer against the distractors of adults, old people, and women. This section functions as a compact map of the branches of medicine, each term tied to its object of study.
Evolution, Nomenclature, and the Cell
The guide then shifts to evolution, crediting Charles Robert Darwin as the author of “The Origin of Species,” and posing a question about who wrote that famous book, with Albert Einstein, Charles Darwin, John Dalton, and Robert Boyle as the options. Existentialism is mentioned in passing as a topic. Nomenclature comes next, including the binomial nomenclature system that uses genus and species, illustrated by examples such as melanostictus and Homo sapiens, and attributed to Carolus Linnaeus. Cell biology follows in dense succession: the cell, the cell wall, the cell membrane, the cytoplasm, mitochondria, ribosomes, rough ER, the nucleus, the nucleolus, the nucleoplasm, chromatin, nuclear pores, the outer membrane, and plastids. Plastid types include the chloroplast, with its structures the granum, a stack of thylakoids, the thylakoid itself, and the stroma, the aqueous space. A question concerns Mycoplasma gallisepticum. Cell division is then covered, distinguishing mitosis from meiosis, with parental cell, replication, cell division, and the resulting daughter cells, and amitosis is also named.
Tissues, Genetics, and the Molecules of Heredity
Tissue types are listed in turn: epithelial tissue, with its squamous, cuboidal, and columnar forms, then connective tissue, muscular tissue, and nerve tissue. Genetics is introduced through the law of segregation and independent assortment, along with genetic engineering. Chromosome terminology includes the chromatid, the centromere, and the researcher Waldeyer, while DNA, RNA, and the XX and XY chromosomes are noted. Nucleic acids are divided into DNA, spelled out as deoxyribonucleic acid, and RNA, ribonucleic acid, alongside ATP, ADP, AMP, GTP, and the restriction enzyme. The section reads as a compressed inventory of the machinery of heredity.
Plant Nutrition and the Two Pollinations
The next stretch of material turns to plant nutrition, offering a mnemonic built on magnesium, calcium, and iron for “Nice CHOPS,” where CHOPS stands for carbon, hydrogen, oxygen, phosphorus, and sulfur. Macronutrients and micronutrients are listed, and a matching exercise asks about essential elements, with answers involving nitrogen, phosphorus, potassium, sulfur, and zinc among others. Two types of pollination are then defined and set side by side: self-pollination and cross-pollination, presented as a matching or identification exercise.
Animal Diversity and Living Fossils
Animal diversity is handled through a chain of logical statements: all Mammalia are Chordata, and all Rodentia are Mammalia, while some Chordata are Aves. A multiple-choice question asks which statement must be true, and the answer is that all Rodentia are Chordata. Homo sapiens is noted as a chordate species. Another question asks which animal is not a mammal, with the crocodile as the answer against the elephant, bat, and whale. The largest living bird is identified as the ostrich, the kiwi is stated to be native to New Zealand, and the octopus is noted to have eight tentacles. Living fossils are then mentioned, with Cycas among the examples, described as organisms that have remained unchanged over long geological periods.
Viruses, Their Diseases, and Contagion
Microbiology arrives through a table pairing diseases with their causative viruses: smallpox with variola, chickenpox with varicella, flu with the influenza virus, SARS with the SARS virus, measles with the measles virus, mumps with the mumps virus, polio with poliomyelitis, jaundice with the hepatitis virus, AIDS with HIV, bird flu with H5N1, swine flu with H1N1, rabies with the street virus, Ebola with ebolavirus, and herpes simplex with herpes simplex. The incubation period of influenza is noted. SARS is spelled out as Severe Acute Respiratory Syndrome. AIDS is explained as Acquired Immune Deficiency Syndrome caused by HIV, the human immunodeficiency virus, which attacks the immune system. Polio is described as affecting nerve movement and caused by a virus. Dengue fever is attributed to Flavivirus, transmitted by the Aedes aegypti mosquito, and the Zika virus is also mentioned. A question asks which disease is not contagious, with typhoid as the answer against mumps, smallpox, and tuberculosis, and another asks about the shortest incubation period, with influenza as the answer. Further questions return to the octopus’s eight tentacles, the ostrich as the largest living bird, the kiwi’s native New Zealand, and Aedes aegypti as the dengue vector.
Planets, Eclipses, and the Shape of the Earth
The guide then lifts its gaze to astronomy. A question asks for the largest planet in the solar system, with Jupiter, Saturn, Mars, Earth, and “none of these” as the options. Another asks which item does not logically belong in the list “Mars, Jupiter, Comet, Earth, Neptune.” The distance between the earth and the moon is asked in miles, with options running from 2,39,000 to 2,69,000, and the approximate distance is also given in alternative units, including 257 × 10² miles, 250 × 10³ miles, 930 × 10⁵ miles, and 67 × 10⁶ miles. The approximate circumference of the earth is asked, with options of 50,000, 25,000, 16,000, and 40,000 kilometers, and the average specific gravity of the earth is asked, with options of 3.517, 4.517, 5.517, and 9.517. Solar and lunar eclipses are distinguished, and a lunar eclipse is said to occur on a full moon day, against the alternatives of a new moon day, a half moon day, and a moonless day.
Space Agencies, First Flights, and the Race Beyond Earth
Space agencies come next. NASA is described as the US space research agency, formed on 29 July 1958, headquartered in Washington DC, with its rocket launch site at Cape Canaveral, Florida. The European Space Agency was formed in 1975, headquartered in Paris, with its membership noted. The spacecraft roster includes Sputnik-I and Sputnik-II, Luna-21 and Luna-3, Vostok-1 carrying Yuri Gagarin, Vostok-6 carrying Valentina Tereshkova, Intelsat-1, Early Bird, and Soyuz. Apollo-11 is tied to the words “This is a small step for a man but a giant leap for mankind.” A question asks the year man landed on the moon, and another identifies the astronaut who spoke those words, with Neil Armstrong as the answer against Edward White, Yuri Gagarin, and Allen Shepherd. Space probes listed include Pioneer, Landsat-1, Voyager, Viking, Galileo, Pathfinder, and Chandrayaan-1. Sputnik is asked as the name of the first space satellite. Dennis Tito and Anousheh Ansari are named as space tourists.
Human Spaceflight, the Space Station, and the Hubble
A human spaceflight table follows: Russia’s Vostok-1 carried Yuri Gagarin, a cosmonaut; the UK’s Mercury-Redstone carried Alan Shepard, an astronaut; China’s Shenzhou 5 carried Yang Liwei, a taikonaut, and Jhai Zhigang is also named. The International Space Station’s participating agencies are listed as NASA, ESA, the Russian Federal Space Agency, the Japan Aerospace Exploration Agency, and the Canadian Space Agency. The Hubble Space Telescope is described as placed in orbit around the earth for cosmic observation.
The Earth’s Two Motions and the Longest Day
The final stretch turns to the earth’s motion. Diurnal motion, or rotation, produces day and night, the shadow circle, morning and evening, dawn, and twilight; it also causes temperature differences, ocean currents, tides, and wind circulation, and it determines time. Annual motion, or revolution, has its own speed, with perihelion and aphelion noted; its effects are the changes of seasons and the fluctuation of day and night, with a Northern and Southern Hemisphere table. A question asks whether the earth is moving or stationary. The earth’s travel velocity around the sun is asked, with options of 16, 18.5, 90, and 21.4 miles per second, and the longest day of the year is asked, with options of 6th June, 15th June, 26th June, and “none of these.” With that question the appended material closes, ending the volume on the earth’s slow circuit around its star.
Main Arguments
The book’s central claim is that scientific knowledge is cumulative, interconnected, and testable. It does not argue for a thesis in the manner of a monograph; instead it demonstrates, through its organization, that chemistry, physics, and biology rest on a shared foundation of measurable quantities and general laws. The 2n² rule governs electron capacity across every shell; Ohm’s law governs every circuit; the laws of segregation and independent assortment govern every inheritance. The book repeatedly returns to the idea that a small number of principles can be applied to a very large number of cases.
A second argument concerns the relationship between definition and application. The book does not merely define isotopes, isobars, and isotones; it gives worked examples — protium, deuterium, and tritium for hydrogen; copper-64 and zinc-64 for isobars; phosphorus-31, sulphur-32, and silicon-30 for isotones — and then tests the definitions through multiple-choice questions. The same pattern holds in physics, where the formulae P = VI, P = I²R, and P = V²/R are immediately followed by numerical problems, and in biology, where the definition of a mammal is tested against the crocodile, the bat, and the whale.
A third argument, implicit but pervasive, is that science has a history and a geography. The book names Aristotle, Theophrastus, Al Biruni, Ibn Sina, An Nafis, Harvey, Linnaeus, Darwin, Fleming, Einstein, and Salim Ali, and it records the contributions of Russia, the United States, China, and Europe to space exploration. The effect is to present science as a human enterprise distributed across cultures and centuries, not as a body of doctrine handed down intact.
A fourth argument concerns the practical value of knowledge. The book’s questions are drawn from bank recruitment tests and university admission examinations, and its content is calibrated to what those tests require. The inclusion of applied material — galvanizing, alloys, soap manufacture, electric bills, transformers, UPS systems, solar cells, CNG — makes the case that scientific literacy is a vocational asset as well as an intellectual one.
Key Concepts
Several named concepts recur throughout the book and give it its conceptual spine. In chemistry, the most important are the 2n² formula for maximum electron capacity, the distinction between atomic number (the number of protons) and mass number (protons plus neutrons, A = p + N), and the triad of isotopes, isobars, and isotones. Isotopes share an atomic number but differ in mass number; isobars share a mass number but differ in atomic number; isotones share a neutron count but differ in mass number. The book illustrates each with concrete examples and returns to them in its questions.
In physics, the governing concepts are Ohm’s law (V = IR), the power formulae (P = VI, P = I²R, P = V²/R), the distinction between series and parallel circuits, the protective function of the fuse and the circuit breaker, and the transformer’s role in changing voltage. The book also introduces the kilowatt-hour as the unit of electrical energy and works through conversions between joules and kilowatt-hours. Radioactivity brings in the becquerel as the SI unit, the half-life of uranium-238, and the distinction between alpha, beta, and gamma rays.
In biology, the key concepts are the binomial nomenclature system of genus and species, attributed to Carolus Linnaeus; the structure of the cell, including the cell wall, cell membrane, cytoplasm, mitochondria, ribosome, nucleus, nucleolus, chromatin, nuclear pores, and plastids; the distinction between mitosis and meiosis; the four tissue types; the laws of segregation and independent assortment; and the structure of DNA and RNA. The book also introduces the concept of the living fossil — an organism that has remained unchanged over long geological periods — and the classification of viruses by the diseases they cause.
In astronomy, the central concepts are the distinction between solar and lunar eclipses, the difference between diurnal motion (rotation) and annual motion (revolution), and the effects of each: day and night, tides, winds, and temperature differences from rotation; seasons and the fluctuation of day length from revolution. The book also introduces perihelion and aphelion, and the geography of space exploration through NASA, ESA, and the International Space Station.
Themes
The most persistent theme is the unity of scientific knowledge. The book moves from the electron shell to the solar system without treating these as separate worlds; the same impulse to classify, measure, and predict runs through chemistry, physics, biology, and astronomy. The 2n² rule and the laws of planetary motion belong, in this book’s imagination, to a single enterprise.
A second theme is the passage from the abstract to the concrete. Definitions are never left bare. Isotopes become protium, deuterium, and tritium; alloys become steel, stainless steel, bronze, brass, and gun metal; ores become chalcopyrite, haematite, and bauxite; diseases become smallpox, chickenpox, influenza, SARS, measles, mumps, polio, jaundice, AIDS, bird flu, swine flu, rabies, Ebola, and herpes. The book consistently anchors its concepts in named, tangible instances.
A third theme is the human story of science. The book is attentive to who discovered what and when: Einstein and relativity, Fleming and penicillin in 1928, Harvey and the circulation of the blood, Darwin and The Origin of Species, Linnaeus and binomial nomenclature, Gagarin and Vostok-1, Tereshkova and Vostok-6, Armstrong and Apollo-11. This biographical thread gives the book a narrative dimension that its question-and-answer format might otherwise obscure.
A fourth theme is the practical and civic value of science. The book discusses renewable and non-renewable energy, the environmental harm caused by fossil fuels, the “greenest” fuel, the desirability of natural gas free of sulphur, the use of solar cells and hydroelectricity, and the role of nuclear energy. It treats scientific literacy as a matter of public consequence, not merely private advancement.
A fifth theme, present throughout but rarely stated, is the examination itself. The book is shaped by the tests it prepares students for, and its rhythms — definition, example, question, answer — reflect the demands of competitive examination. This gives the work a double character: it is both a survey of science and a manual for passing.
The Author’s Conclusions
The book does not close with a formal conclusion. Its final sections are astronomical and geographical, and they end with questions rather than with a summing-up. The last material concerns the earth’s motion — diurnal and annual — and the effects of each: day and night, the shadow circle, morning and evening, dawn and twilight, temperature differences, ocean currents, tides, and wind circulation from rotation; changes of seasons and fluctuation of day and night from revolution. The book notes perihelion and aphelion, presents a table of Northern and Southern Hemisphere effects, and asks whether the earth is moving or stationary. It then poses questions about the earth’s velocity around the sun and about the longest day of the year.
If there is a conclusion to be drawn, it is implicit in the shape of the whole. The book begins with the smallest unit — the electron shell — and ends with the largest — the earth’s orbit. The movement from the atomic to the planetary is itself the argument: that knowledge is continuous, that the same habits of measurement and classification apply at every scale, and that the student who has mastered the 2n² rule and Ohm’s law is equipped to think about eclipses and space agencies. The book’s final questions about the earth’s motion are not a departure from its earlier concerns but their culmination.
Significance
The book’s significance lies partly in what it reveals about science education in Bangladesh and partly in what it reveals about the genre of the examination guide. As a study resource, it is comprehensive and systematic, covering the standard syllabus in chemistry, physics, biology, and astronomy with a density of examples and questions that few textbooks match. Its use of bilingual terminology — Bengali explanation with English technical vocabulary — reflects the linguistic reality of scientific education in the region, where English remains the language of formulae, units, and nomenclature even when the surrounding prose is Bengali.
As a cultural document, the book preserves the texture of a particular educational world. The citations of bank recruitment tests and university admission examinations, the brand label “George’s MP3,” the mixture of rigorous science with general knowledge and history of science — all of these are characteristic of the competitive-examination culture of South Asia. The book is not merely a repository of facts; it is a record of what students were expected to know, and of the institutions that expected them to know it.
Its significance for the general reader is different. The book offers a compact survey of scientific knowledge as it was taught and tested in a particular time and place, and it does so with an unusual combination of breadth and concreteness. It moves from the structure of the atom to the structure of the solar system, from the laws of inheritance to the history of spaceflight, and it does so without losing sight of the practical questions — the electric bill, the fuse, the transformer, the renewable energy source — that connect scientific knowledge to daily life. In that sense, it is a portrait of science as a public possession, taught to a mass audience and tested at scale, and it remains a useful window onto both the science and the society that produced it.
