Knowledge Of Science

STUDY SKILLS 1. Set Goals:-                               If you don’t know what you want to achieve as a student, you won’t know how to get there or if you’ve accomplished things.  2. Use an appointment book:-                                                                          If you keep all your appointments, due dates, and test dates in your head, you won’t have any room left for the new information you are learning about in class.  3. Know your learning style:-                                               Develop techniques and strategies for compensating for possible differences b...

Black Hole : A  black hole is  a place in space where gravity pulls so much that even light can not get out. The gravity  is  so strong because matter has been squeezed into a tiny space. This can happen when a star  is  dying. Because no light can get out, people can't see  black holes . They are invisible As for the  black hole  itself, you  wouldn't  be able to  see  it directly, as it's enshrouded  in  gas and dust. In principle there is no limit to the size of a black hole: it can be as light as a feather or as heavy as a few billion Suns! Their size varies accordingly.  A black hole with a mass equal to that of the Sun would have a radius of three kilometres. Furthermore the radius of a black hole scales in proportion to its mass. So a typical stellar-mass black hole (ten times the mass of the Sun) would have a radius of thirty kilometres, and a supermassive black hole (e.g., one million s...

Always Speak the Truth T elling the truth is a very good habit. If you always speak the truth,you can save yourselves from lots of trouble! Here is the story of a man,who did a lot of bad things, but his promise to tell the truth saved  him.This  is a true story, so read it carefully. O nce a man came to the Prophet Muhammad (PBUH) and said, “Oh Prophet of Allah, I have many bad habits. Which one of them should I give up first?” The Prophet said, “Give up telling lies first and always speak the truth.” The man promised to do so and went home. A t night the man was about to go out to steal. Before setting out, he thought for a moment about the promise he made with the Prophet. “If tomorrow the Prophet asks me where have I been, what shall I say? Shall I say that I went out stealing? No, I cannot say that. But nor can I lie. If I tell the truth, everyone will start hating me and call me a thief. I would be punished for stealing.” So the man decided not ...