“The Knowledge Library”

Knowledge for All, without Barriers…

An Initiative by: Kausik Chakraborty.
04/02/2023 2:44 PM

“The Knowledge Library”

Knowledge for All, without Barriers……….
An Initiative by: Kausik Chakraborty.

The Knowledge Library

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(Topic-wise Posts)

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Latest Posts

Images: Mirrors

Images formed by Concave Mirror Position of object Position of image Nature of image At infinity At focus (F) Real, diminished, inverted Beyond centre of

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Images: Lenses

Images formed by Convex Lens Position of object Position of image Nature of image At infinity At focus Real, diminished, inverted At 2F At 2F

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Facts: Sound

Facts to Remember The speed of sound is 343 m/s The audible range of sound in human beings is 20 Hz to 20,000 Hz The

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Measuring Instruments

Instrument Use Bolometer Instrument for measuring radiation by means of the rise in temperature. Hydrometer Instrument for measuring the density of liquids. Hygrometer Instrument for

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All Subject Posts

Topic of the Week(GK Updates)

An element is defined by the IUPAC as a pure chemical substance composed of atoms with the same number of protons in the atomic nucleus. All atoms of an element have the same number of protons. Fact to Remember Name …

Event Year Birth of Jesus Christ 4 B.C. Death of Jesus Christ 29 A.D. Birth of Prophet Mohammed 570 Emigration of Mohammed to Madina, Beginning of Hijri era 622 Death of Prophet Mohammed 632 Magna Carta, first document limiting the …

Year Event 1851 First telegraph line in India is operational between Calcutta and Diamond Harbour. 1853 First train in India runs from Bombay to Thane. 1857 First war of Indian independence also called the Sepoy Mutiny by the British. 1881 …

Date Day Jan 20 Penguin Awareness Day Jan 31 International Zebra Day Feb 18 World Pangolin Day Feb 27 International Polar Bear Day March 3 World Wildlife Day March 20 World Sparrow Day Apr 14 Dolphin Day Apr 24 World …

Date Day Feb 4 World Cancer Day Mar 21 World Down Syndrome Day Mar 24 World Tuberculosis Day Apr 2 World Autism Awareness Day Apr 7 World Health Day Apr 17 World Hemophilia Day Apr 25 World Malaria Day Jun …

Date Day Remarks Jan 12 National Youth Day Birthday of Swami Vivekananda Jan 15 Army Day Field Marshall K.M. Cariappa took over the command of Army on this day in 1949 from the British. Jan 25 National Voters’ Day With …

The Union Minister of Finance and Corporate Affairs Smt. Nirmala Sitharaman presented the Union Budget 2023-24 in Parliament today. The highlights of the Budget are as follows: PART A Per capita income has more than doubled to ₹1.97 lakh in …

The trombone was created in the 15th century. First made in the 15th century, the trombone has certainly made its mark in music history. Although, the original design, essentially a modified trumpet, is not the same as what we have …

In terms of science, black isn’t a color at all – it’s what you get when there’s a complete lack, or absorption, of visible light. The color black is achromatic, just like white and grey. This means that it has no hue. …

🔹Apostrophe — (’) 🔹Colon — (:) 🔹Semicolon — (;) 🔹Dash — (—) 🔹Comma — (,) 🔹Quotation Marks — (“”) 🔹Hyphen — (-) 🔹Ellipses Dots — (…) 🔹Exclamation Mark — (!) 🔹Question Mark — (?) 🔹Period (Full Stop) — (.) 🔹Parentheses …

▪️Both the legs together have 50% of the nerves of the human body, 50% of the blood vessels and 50% of the blood is flowing through them. *Walk* ▪️ It is the largest circulatory network that connects the body. *So …

Once, there lived a pack of Wolves in the forest. The Wolves hunted animals in the forest and the nearby village every day, but they did not have a leader. Therefore, one day, the Wolves decided to select a leader …

1. Pigeons are actually really smart! They might have a reputation for being a bit…well, stupid – but that’s totally wrong! Pigeons are actually very intelligent animals with complex behaviors and relationships with other pigeons. But how smart are they? …

1. Easter is named after an ancient goddess! Easter is the goddess of dawn, and during the Spring Equinox, people would hold feasts in her honour. The date on which we celebrate Easter changes every year, because of the first …

1. Alexander The Great Founded Ancient Greece! Alexander the Great created Ancient Greece by uniting many city-states. He’s probably the most famous of all Alexanders, as the other contender, Alexander the Average, didn’t achieve that much! 2. Ancient Greeks Hate Beans! …

1. Reptiles can live to a ripe old age! Reptiles are amongst the longest-living species known to scientists. The Aldabra tortoise can live for over 150 years. 2. Some reptiles can detach then regrow their tails! Some lizards can use …

1. Mona Lisa is Not Her Real Name! The woman in the painting’s real name was Lisa Gherardini. The title Mona Lisa roughly translates to “My Lady Lisa.” in Italian. It was commissioned by her husband, an exceedingly wealthy merchant …

1. Hippos are really big Pictures like this don’t do it justice – but the hippo is actually the 3rd largest animal on land! First is elephants (obviously), and 2nd place is rhinos. A fully grown adult hippo can get …

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