PCM Encyclopedia

Home » facts

Category Archives: facts

C++, PYTHON Syllabus Class 12

Computer Science Syllabus Class 12 (C++, Python)…..

CLICK HERE to download syllabus..

Physics Interesting Facts

Some Interesting facts of physics are -:

1.The effect of Relativity made Astronaut Sergei Avdeyev a fraction of a second younger upon his return to Earth after 747 days in space.

2.The Dead Sea is so dense with salt, you can easily float on it without drowning.

3.Lake Baikal in Russia contains more water than all the North American Great Lakes combined.

4.The world’s densest wood, the Black Ironwood (Olea laurifolia), does not float on water and therefore sinks.

5.The mass of our entire atmosphere is estimated to be some 5.5 quadrillion tons (55 followed by 14 zeros).

6.Chewing gum was invented by a dentist, named William Semple – as a way to exercise your jaws.

7.The diameter of a proton is approximately 0.000000000001 mm (1/25,000,000,000,000 inch).

8.You can convert graphite into diamond by applying a temperature of 3000 Celsius and pressure of 100,000 atm.

9.The amount of water beneath our ground soil is 50 times as much as all the water in the rivers and lakes combined.

10.The first ten feet of the ocean hold as much heat as the Earth’s entire atmosphere.

11.The lightning bolt is 3 times hotter than the sun. Submitted by: JieianSubmitted by: Jieian

12.On average, our bodies constantly resist an atmospheric pressure of about 1 kilogram per square inch.

13.The deepest location on Earth is Mariana Trench, about 11km deep in the North Pacific ocean.

14.The bark of the redwood tree is fireproof.

15.If Mount Everest were placed at the bottom of the deepest part of the ocean, its peak would still be a mile underwater. Submitted by: Nikhil, IndiaSubmitted by: Nikhil, India

16.If given the same mass, our body would actually be hotter than the sun.

17.Many physicists believe wormholes (a “shortcut” through space and time) exist all around us but they are smaller than atoms.

18.A solar panel 100 miles by 100 miles (161x161km) in the Mojave Desert (USA) could replace all the coal now burned to generate electricity in the entire U.S.

19.The Atlantic Ocean grows at about the same rate as your fingernails.

20..If you yelled for 8 years, 7 months and 6 days, you would have produced just enough sound energy to heat up one cup of coffee.

21.The average ice berg weighs 20,000,000 tons.

22.Lightning strikes about 6,000 times per minute on our planet.

23.A gallon of water weighs 8.34 pounds (3.8kg).

24.If an item moves very, very fast, it becomes smaller and heavier.

25.Minus 40 degrees Celsius is exactly the same temperature as minus 40 degrees Fahrenheit.

26.Hot water freezes quicker than cold water.

27.The only rock that floats in water is pumice.

28.Mexico City is sinking at a rate of 18 inches (46cm) per year as a result of draining water.

29.1 inch (25mm) of rain water is equivalent to 15 inches (381mm) of dry, powdery snow.

30.The oldest and largest clearly visible meteorite crater site in the world is The Vredefort Dome in Free State, South Africa. It is 380km across.

31.The greatest tide change on earth occurs in the Bay of Fundy. The difference between low tide and high tide can be as great as 16.6 meters (54 ft.)

32.The temperature in fahrenheit can be determined by counting the number of cricket chirps in 14 seconds and adding 40.

33.The average ocean floor is about 3,600 meters deep (12000ft).

34.Sunlight can penetrate clean ocean water to a depth of 73 meters (240ft.)

35.The North Atlantic gets 2.5 centimetres (1in) wider every year.

36.Hawaii is moving toward Japan 10 centimetres (4 inches) every year.

37.Due to gravitational effects, you weigh slightly less when the moon is directly overhead.

38.Lake Baikal is the deepest lake in the world.

39.When hydrogen burns in the air, water is formed.

40.Diamonds are the hardest known substance.

Maths Interesting and Amazing Facts

Maths Interesting and Amazing Facts

amazing maths facts
maths interesting and amazing facts
  1. The word ‘mathematics’ comes from the Greek máthēma, which means learning, study, science.
  2. Do you know a word known as Dyscalculia? Dyscalculia means difficulty in learning arithmetic, such as difficulty in understanding numbers, and learning maths facts!
  3. In America, mathematics is known as ‘math’, they say that ‘mathematics’ functions as a singular noun so as per them ‘math’ should be singular too.
  4. Do you know ‘Mathematics’ is an anagram of ‘me asthmatic’ (An Anagram is word or phrase made by transposing or rearranging letter of other words or phrase.)
  5. Notches (cuts or indentation) on animal bones prove that humans have been doing mathematics since around 30,000 BC.
  6. The word ‘hundrath’ in Old Norse (old language from where English language originated), from which word ‘hundred’ derives, meant not 100 but 120.
  7. What comes after a million, billion and trillion? A quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion and undecillion.
  8. The number 5 is pronounced as ‘Ha’ in Thai language.555 is also used by some as slang for ‘HaHaHa’.
  9. Different names for the number 0 include zero, nought, naught, nil, zilch and zip.
  10. Zero ( 0 ) is the only number which can not be represented by Roman numerals.
  11. The name ‘zero’ derives from the Arabic word sifr which also gave us the English word ‘cipher’ meaning ‘a secret way of writing’ .
  12. Do you know the magic of no. nine (9)? Multiply any number with nine (9 ) and then sum all individual digits of the result (product) to make it single digit, the sum of all these individual digits would always be nine (9).
  13. Here is an interesting trick to check divisibility of any number by number 3.A number is divisible by three if the sum of its digits is divisible by three (3).
  14. The = sign (“equals sign”) was invented by 16th Century Welsh mathematician Robert Recorde, who was fed up with writing “is equal to” in his equations.
  15. Googol (meaning & origin of Google brand ) is the term used for a number 1 followed by 100 zeros and that it was used by a nine-year old, Milton Sirotta, in 1940.
  16. The name of the popular search engine ‘Google’ came from a misspelling of the word ‘googol’.
  17. Abacus is considered the origin of the calculator.
  18. Have you ever noticed that the opposite sides a die always add up to seven (7).
  19. 12,345,678,987,654,321 is the product of 111,111,111 x 111,111,111. Notice the sequence of the numbers 1 to 9 and back to 1.
  20. Plus (+) and Minus (-) sign symbols were used as early as 1489 A.D.
  21. An icosagon is a shape with 20 sides.
  22. Trigonometry is the study of the relationship between the angles of triangles and their sides.
  23. If you add up the numbers 1-100 consecutively (1+2+3+4+5…) the total is 5050.
  24. 2 and 5 are the only primes that end in 2 or 5.
  25. From 0 to 1,000, the letter “A” only appears in 1,000 (“one thousand”).
  26. A ‘jiffy’ is an actual unit of time for 1/100th of a second.
  27. ‘FOUR’ is the only number in the English language that is spelt with the same number of letters as the number itself
  28. 40 when written “forty” is the only number with letters in alphabetical order, while “one” is the only one with letters in reverse order.
  29. In a group of 23 people, at least two have the same birthday with the probability greater than 1/2 .
  30. If there are 50 students in a class then it’s virtually certain that two will share the same birthday..
  31. Among all shapes with the same perimeter a circle has the largest area.
  32. Among all shapes with the same area circle has the shortest perimeter .
  33. In 1995 in Taipei, citizens were allowed to remove ‘4’ from street numbers because it sounded like ‘death’ in Chinese. Many Chinese hospitals do not have a 4th floor.
  34. The word “FRACTION” derives from the Latin ” fractio – to break”.
  35. In working out mathematical equations, the Greek mathematician ,Pythagoreans used little rocks to represent numbers.Hence the name of Calculus was born which means pebbles in Greek.
  36. In many cultures no 13 is considered unlucky, well,there are many myths around it .One is that In some ancient European religions, there were 12 good gods and one evil god; the evil god was called the 13th god.Other is superstition goes back to the Last Supper. There were 13 people at the meal, including Jesus Christ, and Judas was thought to be the 13th guest.
  37. Have you heard about Fibonacci? It is the sequence of numbers wherein a number is the result of adding the two numbers before it! Here is an example: 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on
  38. Want to remember the value of Pi (3.1415926) in easy way ? You can do it by counting each word’s letters in ‘May I have a large container of coffee?’
  39. Have you heard about a Palindrome Number? It is a number that reads the same backwards and forward, e.g. 12421.

Computer Interesting Facts

computer interesting facts
  1. While it took the radio 38 years, and the television a short 13 years, it took the World Wide Web only 4 years to reach 50 million users.
  2. The world’s first computer, called the Z1, was invented by Konrad Zuse in 1936. His next invention, the Z2 was finished in 1939 and was the first fully functioning electro-mechanical computer.
  3. The Dvorak keyboard is more efficient than QWERTY. The standard “QWERTY” keyboard was not designed with ease of typing in mind. Rather, it was designed to keep early typewriters from jamming. 130 years later, in the age of computers, people are still using this awkward, inefficient keyboard layout. Few know that there is a much faster, easier, more efficient, and more comfortable alternative: the Dvorak (pronounced ‘duh VOR ak’) keyboard. Unlike QWERTY, the Dvorak keyboard was scientifically designed for increased speed and accuracy. It is estimated to be 12 to 20 times more efficient than QWERTY. Dvorak is great for beginning and experienced typists alike. It’s the layout used by some of the world’s fastest typists.
  4. TYPEWRITER is the longest word that can be made using the letters only on one row of the keyboard.
  5. In the 1980s, an IBM computer wasn’t considered 100 percent compatible unless it could run Microsoft Flight Simulator.
  6. The first computer mouse was invented by Doug Engelbart in around 1964 and was made of wood.
  7. Domain names are being registered at a rate of more than one million names every month.
  8. There are approximately 1.06 billion instant messaging accounts worldwide.
  9. The first banner advertising was used in 1994.
  10. E-mail has been around longer than the World Wide Web.
  11. The average computer user blinks 7 times a minute, less than half the normal rate of 20.
  12. By the year 2012 there will be approximately 17 billion devices connected to the internet.
  13. There are approximately 1,319,872,109 people on the internet.
  14. Another name for a Microsoft Windows tutorial is ‘Crash Course’!
  15. Bill Gates, the founder of Microsoft was a college drop out.
  16. There are approx. 6,000 new computer viruses released every month.
  17. If you want to get a computer aquarium, then you must get the Macquariums which are aquariums made from old Macintosh computers.
  18. It is believed that the first computer virus released in the world was a boot sector virus, which was created in the year 1986 by Farooq Alvi brothers. It was designed by them to protect their research work.
  19. The group of 12 engineers who designed IBM PC were called as “The Dirty Dozen”.
  20. The quintessential command ‘Ctrl+Alt+Delete’ was written by David Bradley.
  21. Sweden is a country with the highest percentage of internet users (75 per cent).
  22. I am sure most of us must have played the game Tetris. Since the time it was created in early eighties, it has sold more than 40 million copies worldwide, which made it’s creator richer by $8m.
  23. Almost all computer users must know how destructive a virus can be. But then, it would be interesting to know that a virus cannot corrupt your PC on its own. It corrupts your system only when you activate it by either downloading infected files from the internet or by sharing these infected files.
  24. Computer circuitry can be destroyed by static electricity, it is so mild for humans that they don’t even feel it.
  25. “Stewardesses” is the longest word that is typed with only the left hand.