یاد رکھیں گیس پیپر کو پی ڈی ایف میں ڈنلوڈ کرنے
سےبہترہے، یہاں ویب سائیٹ سے وضاحت کے ساتھ پڑھیں۔ کیونکہ ان سوالات کے
متعلق ہی بار بار سوالات بعض اوقات پیپرمیں پوچھے جاتے ہیں اوراس کے علاوہ
ویب سائیٹ پر آئے روز پیپرز کے مطابق نیو سوالات بھی ایڈ کیے جاتے ہیں ۔ اس
لیے وضاحت کے ساتھ پڑھنے سے اپکی تیاری انشا اللہ اچھی ہو جائے گی۔
Sunspots are darkish, planet-sized regions that seem on the "floor" of the sun. Sunspots are "darkish" because they're cooler than their environment.
A big sunspot would possibly have a critical temperature of 4,000 ok (about three,seven hundred° C or 6,seven hundred° F), tons lower than the five,800 ok (about five,500° C or 10,000° F) temperature of the adjacent photosphere.
Sunspots are most effective darkish in evaluation to the bright face of the sun. If you may reduce a median sunspot out of the sun and place it someplace else within the night time sky, it might be about as shiny as a complete moon.
Sunspots have a lighter outer segment referred to as the penumbra, and a darker central area named the umbra.
موسم بدلتا ہے کیونکہ زمین سورج کے گرد گھوم رہی ہے۔
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays.
So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Sound travels at different speeds depending on what it is traveling through. Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids.
A voltaic cell is an electrochemical cell that makes use of a chemical reaction to supply electrical energy. Zinc is used as anode and copper is used as cathode.
The voltaic cell makes use of extraordinary metal electrodes, each in an electrolyte answer. The anode will go through oxidation and the cathode will undergo reduction. The steel of the anode will oxidize, going from an oxidation kingdom of zero (in the solid form) to a positive oxidation nation, and it becomes an ion. at the cathode, the steel ion within the answer will accept one or extra electrons from the cathode, and the ion’s oxidation kingdom will lessen to 0.
This paperwork a strong steel that deposits on the cathode. the two electrodes ought to be electrically linked to each different, taking into consideration a go with the flow of electrons that depart the metal of the anode and glide thru this connection to the ions on the surface of the cathode. This float of electrons is an electrical modern-day that can be used to do work, inclusive of flip a motor or electricity a mild.
