Sunday, December 9, 2018
Saturday, December 8, 2018
Wednesday, November 21, 2018
Monday, November 19, 2018
Sunday, November 18, 2018
Saturday, November 17, 2018
Thursday, November 15, 2018
Tuesday, November 13, 2018
Sunday, November 11, 2018
Friday, November 9, 2018
Wednesday, November 7, 2018
Tuesday, November 6, 2018
Monday, November 5, 2018
Thursday, November 1, 2018
Wednesday, October 31, 2018
Tuesday, October 30, 2018
Monday, October 29, 2018
Sunday, October 28, 2018
Saturday, October 27, 2018
Friday, October 26, 2018
Thursday, October 25, 2018
Wednesday, October 24, 2018
Wednesday, October 17, 2018
Wednesday, October 10, 2018
Sunday, October 7, 2018
Saturday, October 6, 2018
Wednesday, October 3, 2018
Friday, September 21, 2018
What is nucleus
Nucleus:-
The nucleus lies in the center of an atom. It has particles in it called (protons and neutrons). Around the nucleus there are electrons revolving in the circular paths called orbits or shells.
The size (which is infact diameter) of the nucleus is between 1.6 fm (10−15 m) (for a proton in light hydrogen) to about 15 fm. Although it is only a very small part of the atom, the nucleus has most of the mass. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a very small contribution from the orbiting electrons.
What is Neutron
Neutron:-
A neutron is a particle of an atom which is found in the nucleus of an atom except simple hydrogen. Its name is neutron as this particle does not have any charge. Neutrons are extremely dense. A single neutron would have a mass of only 1.675 ? 10-27 kilogram.The number of neutron in nucleus is called the atomic number. This number gives each element its unique identity. In the atoms of any particular element, for example carbon, the number of protons in the nuclei is always the same, but the number of neutrons can change.
What is Proton
Proton:-
A proton is a particle of an atom which has a positive electric charge that lies within the nucleus of an atom. The proton has +1 charge (alternatively, 1,602 x 10-19 coulombs), exactly the opposite of the charge -1 containing the electron.
In a neutral atom, the number of electrons and protons are always equal. While when an atom gain or loses an electron then it becomes an ion (cation or anion). In an ion the number of electrons and protons do not remain same.
What is electron
Electron:-
Electron is a negatively charged particle in an atom. Electrons are found around the nucleus in circular paths called Shells.Electrons have no known components or substructure. Therefore they are generally considered to be elementry particles.
In electrical conductors, current flow results from the movement of electrons from atom to atom.
The charge on a single electron is considered as the unit electrical charge. It is assigned negative polarity. The charge on an electron is equal, but opposite, to the positive charge on a proton.
Sunday, July 1, 2018
What is Kidney and its functions
Kidney:-
Two bean-shaped organs which are called kidney found in the renal system. They help the body pass waste as urine. Kidneys do one more important work. They filter the blood and then send it back to the heart.
Functions:-
Some important functions performed by kidneys are:
- Maintaining overall fluid balance
- Regulating and filtering minerals from blood
- Filtering waste materials from food, medications, and toxic substances
- Creating hormones that help produce red blood cells, promote bone health, and regulate blood pressure
How to Prevent Heart Disease And Stroke
Prevention Of Heart Attack:-
1. Don't smoke
Do not make smoking your habit or do not use it even as a fun if you want to avoid heart attack. And if people in your household smoke, encourage them to quit, too.
2. Control your cholesterol
When blood flows through your blood vessels, it can drop traces of cholesterol, fat, and calcium, creating a buildup of plaque in your arteries. Too much of that plaque makes a heart attack more likely. If you don’t know your cholesterol levels, ask your doctor for a blood test.
3. Reduce high blood pressure
It's the single largest risk factor for stroke. Watch your salt intake, and exercise on a daily basis. Your doctor may also prescribe medications that flush out excess water and sodium, consequently reducing blood pressure.
4. Get moving
Exercising for 30 to 60 minutes at least four days a week can help lower blood pressure, lower cholesterol, and keep your weight at a healthy level. Going for a brisk walk is all it takes to start exercising.
5. Eat Good Diet
Add plenty of fruits and veggies, grains, and foods high in omega-3 fatty acids like fresh tuna or herring to your diet. Cut down on salt, saturated fats, sweets, and red meats. Avoid trans fats and food with “hydrogenated” or “partially hydrogenated” ingredients. Variety in your diet is a good way to get all the nutrients you need.
6. Manage diabetes
If you have diabetes, you are two to four times more likely to develop cardiovascular disease because diabetes raises LDL (the bad) cholesterol. Exercising and making healthy food choices will help you manage diabetes AND lower your LDL cholesterol levels.
7. Reduce stress
Research has shown a direct correlation between heart disease and stress. In addition, stress often leads people to smoke or overeat.
8. Limit alcohol
Drinking excessively can raise blood pressure and cause heart failure or strokes. However, research has shown that moderate alcohol intakeone drink a day for women or two drinks for men a daycan lower your risk for heart disease.
9. Use medication
If you doctor has prescribed cholesterol- or blood pressure-lowering medications, take them as directed. In addition, your doctor may suggest that you take a daily aspirin to reduce your heart attack risk.
10. Relax Yourself
Find a relaxation method that works for you. Yoga, meditation, dedicated time to unwind after work -- these can help keep your stress levels down. Stressful emotions such as anger and hostility may also lead to heart attack risk, so keep calm and be cool.
Symptoms Of Heart Attack
Symptoms Of Heart Attack:-
The common symptoms of heart attack found in human being are
Chest discomfortMany people feel discomfort in the center of the chest only even only for a few minutes or that goes away and comes back. It can feel like uncomfortable pressure, squeezing, fullness or pain.
Discomfort in other areas of the upper body
Symptoms can include pain or discomfort in one or both arms, the back, neck, jaw or stomach.
Shortness of breath
Shortness of breath
Shortness of breath with or without chest discomfort.
Other signs
Other signs
Other signs may include breaking out in a cold sweat, nausea or lightheadedness.
What is Heart Attack
Heart Attack:-
When the blood flow to the heart suddenly becomes blocked the heart attack happens. When the blood not come to the heart the heart can't get enough oxygen. If not treated quickly, the heart muscle begins to die. But if you do get quick treatment, you may be able to prevent or limit damage to the heart muscle. That's why it's important to know the symptoms of a heart attack so that you or anybody else can contact the doctor. You should contact, even if you are not sure that it is a heart attack.
Saturday, June 30, 2018
Why Lightning Comes Before Thunder
Speed Of Light Is Faster Than Sound:-
In nature, a lightning flash and the associated thunder occur at almost the same time in a thunderstorm. A person on the ground sees the lightning flash before hearing the thunder because light at a speed of around 300,000,000 meters per second travels much faster than sound which moves at 340 meters per second. If one is 1,000 meters away from the thunderstorm, he/she would see the flash almost instantly after lightning occurs as it takes just a few microseconds, while the thunder arrives only after about 3 seconds (1,000 meters divided by 340 meters per second).
Precautions For Flashes Of Lightning
Precautions For Flashes Of Lightning:-
Following are some precautions to avoid the danger of the flash of lightning.
- Stay away from open spaces. But, do not stand under a tree. The best place is inside a building.
- If you are swimming, get out of the water. Get out as soon as you see a storm coming. The storm may seem far away, but lightning can travel over 20 miles!
- During a thunderstorm, shut off or unplug all electrical items. Do not use the phone.
- Never walk in a thunderstorm carrying a metal pole. Don't even carry an umbrella!
- How will you know if a lightning strike is near you? You will feel the hair on your head or body start to stand up. If this happens, go to a safe place. Go quickly! If there is no safe place near, get as close to the ground as you can
Thunder Through Flashes Of Lightning
Thunder Through Flashes Of Lightning:-
As hail moves within the cloud it picks up a negative charge by rubbing against smaller positively charged ice crystals. A negative charge forms at the base of the cloud where the hail collects, while the lighter ice crystals remain near the top of the cloud and create a positive charge.
The negative charge is attracted to the Earth's surface and other clouds and objects and when the attraction becomes too strong, the positive and negative charges come together, or discharge, to balance the difference in a flash of lightning (sometimes known as a lightning strike or lightning bolt). The rapid expansion and heating of air caused by lightning produces the accompanying loud clap of thunder.
How Thunder Form
Formation Of Thunder:-
Thunderstorms develop when the atmosphere is unstable - this is when warm air exists underneath much colder air. As the warm air rises it cools and condenses forming small droplets of water. If there is enough instability in the air, the updraft of warm air is rapid and the water vapour will quickly form a cumulonimbus cloud. Typically, these cumulonimbus clouds can form in under an hour.
As the warm air continues to rise, the water droplets combine to create larger droplets which freeze to form ice crystals. As result of circulating air in the clouds, water freezes on the surface of the droplet or crystal. Eventually the droplets become too heavy to be supported by the updraughts of air and they fall as hail.
Monday, June 25, 2018
Uses and Types of Computers
Uses Of Computer:-
Computers have wide uses in our daily life—from scientific data recording to engineering to everyday personal use. The applications and benefits of computer are increasing day by day. There are many types of computers which performs different tasks such as weather monitoring and tracking to processing simple tasks such as surfing the Internet and checking email.
Some of them are as follows.
Supercomputers
" Seymour Cray" built the first supercomputer in 1963 called the CDC 6600. Supercomputers provide the fastest processing speed of any computer. Used for highly complex calculations, supercomputers possess extreme processing capabilities. For example, the Jaguar, a Cray Inc. supercomputer, operates at 1750 Teraflops (floating point operations per second) at peak performance—which means the system can calculate 1,750,000 Gigabytes per second. Supercomputers work behind the scenes to drive the most advanced information research forward. They are used for various highly specified applications including weather research, quantum physics, nuclear weapon detonation simulations and a class of problems called the "Grand Challenge problems," a set of problems requiring a high-performance computer.
Computers have wide uses in our daily life—from scientific data recording to engineering to everyday personal use. The applications and benefits of computer are increasing day by day. There are many types of computers which performs different tasks such as weather monitoring and tracking to processing simple tasks such as surfing the Internet and checking email.
Some of them are as follows.
Supercomputers
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" Seymour Cray" built the first supercomputer in 1963 called the CDC 6600. Supercomputers provide the fastest processing speed of any computer. Used for highly complex calculations, supercomputers possess extreme processing capabilities. For example, the Jaguar, a Cray Inc. supercomputer, operates at 1750 Teraflops (floating point operations per second) at peak performance—which means the system can calculate 1,750,000 Gigabytes per second. Supercomputers work behind the scenes to drive the most advanced information research forward. They are used for various highly specified applications including weather research, quantum physics, nuclear weapon detonation simulations and a class of problems called the "Grand Challenge problems," a set of problems requiring a high-performance computer.
Minicomputers
The mid-range computer and currently called a server, is between a microcomputer and mainframe computer. The term "minicomputer" developed during the 1960s to describe computers that utilized transistor technology. During the 1970s and 1980s, the development of microcomputers—or desktops—placed minicomputers in the mid-range designation. They were considered a more powerful single-user machine. True minicomputers began to decline, however, due to a less-expensive minicomputer that used microprocessor technology. Mid-range computers provide processing services for several applications. They are used to run back-end applications such as enterprise email, database systems and network-wide antivirus software.
Microcomputers or PC
Considered the first desktop, the HP 9830, which was released for consumer use in the 1970s, surpassed computers at the time because it featured a hard drive and utilized the BASIC programming language. Microcomputers are the most common consumer device. This computer type includes desktop personal computers and laptops. Microcomputers use a microprocessor to execute instructions and are designed for use by one individual. They are used for office applications, email, Internet access, gaming or education.
Computer
Computer:-
A computer is an electronic machine that do calculations and store information.
Computer uses different softwares and programms to do all these tasks.. For example, it has a word processing program for typing letters and a program called a Web Browser for searching and browsing the internet. Computers are of different styles and volumes e.g. laptops, desktops and tablets. All the computers do the same jobs.
Beginnings
The first programmable computer was designed in 1830s. It was a mechanical computer. Unfortunately it was never built, and it wasn't until World War II that British code breakers built Colossus, the world's first programmable and fully electronic computer.
However, Colossus still didn't include a number of elements present in modern computers. Finally the great mathematician Alan Turing built the computer after World War II.
From science project to everyday tool
Earlier only scientists and engineers were interested in computers. But from the human–computer interaction theories of mouse inventor Douglas Engelbart in the 1960s to the release of the Apple Macintosh computer in 1984, they became easier to use and more capable of tasks that ordinary people could carry out.
Now, with the spread of personal computers (PCs), mobile phones, notebooks and tablets, computers have become part of our everyday lives. It's almost impossible to imagine modern society without them.
How to reset samsung galaxy s6 edge plus
Steps for hard resetting of Samsung Galaxy S6 Edge plus:-
Firstly turn off your mobile with power button.
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s6 plus
Steps for hard resetting of Samsung Galaxy S6 Plus:-
Firstly turn off your mobile with power button.
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s6 edge
Steps for hard resetting of Samsung Galaxy S6 Edge:-
Firstly turn off your mobile with power button.
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s6 mobile
Steps for hard resetting of Samsung Galaxy S6:-
First of all press power button turn your mobile off.
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s5 mobile
Steps for hard resetting of Samsung Galaxy S5:-
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s4 mobile
Steps for hard resetting of Samsung Galaxy S4:-
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s3 mobile
Steps for hard resetting of Samsung Galaxy S3:-
1- Hold Volume Up, Home and Power buttons.
2- Device will vibrate or the Galaxy logo will appear.
3- Release both the buttons now.
4- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset Samsung galaxy s2 I9100 mobile
Steps for hard resetting of Samsung Galaxy S2:-
- Remove battery for few seconds then place it inside.
- Press Volume up and Home button together.
- Press Volume and Power button together for few seconds.
- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
Your mobile will reset now.
How to reset samsung galaxy s1 mobile
Steps for hard resetting of Samsung Galaxy S1:-
1- Press volume (up or down) and power keys together.
2- When samsung logo appears then leave both keys.
3- Press volume up or down key and go to Delete all user data or Wipe Data / Factory Reset.
4- Then press the power key.
Your mobile will reset now.
Saturday, June 23, 2018
What is Physics
It is often said that physics is the study of matter and energy and the changes which take place. It is important to know how matter and energy are related to each other, and what changes they make and through space.
Physicists is of two types.
Experimental physicists and Theoretical physicists.
Experimental Physicists:-
Experimental physicists design and run careful investigations on a broad range of phenomena in nature, often under conditions which are a typical of our everyday lives. They may, for example, investigate what happens to the electrical properties of materials at temperatures very near absolute zero (-273 °C) or measure the characteristics of energy emitted by very hot gases.
Theoretical physicists:-
Theoretical physicists propose and develop models and theories to explain mathematically the results of experimental observations. Experiment and theory therefore have a broad overlap. Accordingly, experimental physicists remain keenly aware of the current theoretical work in their fields, while theoretical physicists must know the experimenters' results and the context in which the results need be interpreted.
At present physicists are trying to Precisely define the most fundamental measurable quantities in the universe (e.g., velocity, electric field, kinetic energy). The effort to find the most fundamental description of the universe is a quest that has historically always been a big part of physics.
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Thursday, June 21, 2018
shortcut keys of powerpoint
| Work | Shortcut Key |
|---|---|
| Zoom | Alt + W, Q, Tab to value you want |
| Switch between outline and thumbnail pane | Ctrl + Shift + Tab |
| Move to next placeholder (if on slide’s last placeholder, this inserts a new slide) | Ctrl + Enter |
| Insert a new slide | Ctrl + M |
| Duplicate the current side | Ctrl + D |
| Increase font size | Ctrl + Shift + > |
| Decrease font size | Ctrl + Shift + < |
| Display the font dialog box | Ctrl + T or Ctrl + Shift + F |
| Change case | Shift + F3 |
| Apply superscript formatting | Ctrl + Equal sign |
| Apply subscript formatting | Ctrl + Shift + Plus sign |
| Remove manual character formatting | Ctrl + Spacebar |
| Center a paragraph | Ctrl + E |
| Justify a paragraph | Ctrl + J |
| Left align a paragraph | Ctrl + L |
| Right align a paragraph | Ctrl + R |
| Promote a paragraph in an outline | Alt + Shift + Left arrow |
| Demote a paragraph in an outline | Alt + Shift + Right arrow |
| Move selected outline paragraphs up | Alt + Shift + Up arrow |
| Move selected outline paragraphs down | Alt + Shift + Down arrow |
| Display outline heading level 1 | Alt + Shift + 1 |
| Expand outline text below a heading | Alt + Shift + + |
| Collapse outline text below a heading | Alt + Shift + – |
| Collapse or show all text or headings | Alt + Shift +A |
| Show or hide the grid | Shift + F9 |
| Show or hide the guides | Alt + F9 |
| Activate the pen tool during a show | Ctrl + P |
| Erase pen tool drawings during a show | E |
| Turn off the pen tool during a show | Esc |
| Change the pen to a pointer during a show | Ctrl + A |
| Hide the pointer or pen during a show | Ctrl + H |
| Move to the next hyperlink during a show | Tab |
| Make the screen go black during a show | B |
| Make the screen go white during a show | W |
| Stop or restart an automatic show | S |
| Return to the first slide during show | 1 + Enter |
| Group Items (with items selected) | Ctrl + G |
| Ungroup | Ctrl + Shift + G |
| During presentation, Go to slide number | Slide number + Enter |
| Copy formatting of selected shape | Ctrl + Shift + C |
| Paste formatting only to another shape | Ctrl + Shift + V |
| Insert hyperlink | Ctrl + K |
| Stop the show. Press S again to restart the show | S |
| End the slide show | Esc |
| Select to the end of a word | Ctrl + Shift + Right arrow |
| Select to the beginning of a word | Ctrl + Shift + Left arrow |
| Select all objects | Ctrl + A (on Slides tab) |
| Select all slides | Ctrl + A (in Slide Sorter view) |
| Select all text | Ctrl + A (on the Outline tab) |
| Delete one word to the left | Ctrl + Backspace |
| Delete one word to the right | Ctrl + Delete |
| Cut selected object or text | Ctrl + X |
| Copy selected object or text | Ctrl + C |
| Paste cut or copied object or text | Ctrl + V |
| Undo | Ctrl + Z |
| Redo | Ctrl + Y |
| Open Find dialog box | Ctrl + F |
| Cancel | Esc |
| Move to File tab ribbon | Alt + F, use letters to navigate |
| Move to Home tab ribbon | Alt + H, use letters to navigate |
| Move to Insert tab ribbon | Alt + N, use letters to navigate |
| Move to Design tab ribbon | Alt + G, use letters to navigate |
| Move to Transitions tab ribbon | Alt + K, use letters to navigate |
| Move to Animations tab ribbon | Alt + A, use letters to navigate |
| Move to Slide Show tab ribbon | Alt + S, use letters to navigate |
| Move to Review tab ribbon | Alt + R, use letters to navigate |
| Move to View tab ribbon | Alt + W, use letters to navigate |
| On the ribbon, to move between commands | Tab or Shift-tab |
| To move between groups on a ribbon | Ctrl + Right Arrow or Ctrl + Left Arrow |
| Activate a selected command on the ribbon | Spacebar or Enter key |
| Open a gallery on the ribbon | Spacebar or Enter key |
| Finish with a control on the ribbon and move back to the document | Enter key |
| Expand or collapse the ribbon | Ctrl + F1 |
| Help | F1 |
| Edit in selected placeholder | F2 |
| Repeat | F4 |
| Run a presentation | F5 |
| View the slide show from the current slide forward | Shift + F5 |
| Move clockwise among panes in Normal view | F6 |
| Move counterclockwise among panes in Normal view | Shift + F6 |
| Spellcheck | F7 |
| Display ribbon key tip letters | F10 |
| Opens Save As dialog box | F12 |
| Action | Shortcut Key |
|---|---|
| Switch between outline and thumbnail pane | Ctrl + Shift + Tab |
| Move to next placeholder (if on slide’s last placeholder, this inserts a new slide) | Ctrl + Enter |
| Insert a new slide | Ctrl + M |
| Duplicate the current side | Ctrl + D |
| Increase font size | Ctrl + Shift + > |
| Decrease font size | Ctrl + Shift + < |
| Display the font dialog box | Ctrl + T or Ctrl + Shift + F |
| Change case | Shift + F3 |
| Apply superscript formatting | Ctrl + Equal sign |
| Apply subscript formatting | Ctrl + Shift + Plus sign |
| Remove manual character formatting | Ctrl + Spacebar |
| Center a paragraph | Ctrl + E |
| Justify a paragraph | Ctrl + J |
| Left align a paragraph | Ctrl + L |
| Right align a paragraph | Ctrl + R |
| Promote a paragraph in an outline | Alt + Shift + Left arrow |
| Demote a paragraph in an outline | Alt + Shift + Right arrow |
| Move selected outline paragraphs up | Alt + Shift + Up arrow |
| Move selected outline paragraphs down | Alt + Shift + Down arrow |
| Display outline heading level 1 | Alt + Shift + 1 |
| Expand outline text below a heading | Alt + Shift + + |
| Collapse outline text below a heading | Alt + Shift + – |
| Collapse or show all text or headings | Alt + Shift +A |
| Show or hide the grid | Shift + F9 |
| Show or hide the guides | Alt + F9 |
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