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۔
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.
Dry air from Earth's atmosphere contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases (by volume), but generally a variable amount of water vapor is also present, on average about 1% at sea level.
A single gene mutation results in resistance to DDT and pyrethroids, a class of pesticides used in bed nets. According to a new study in the journal Geno Mosquitoes (Anopheles funestus), Geno Mosquitoes (Anopheles funestus) is a malaria vector, and most strategies for controlling disease epidemics focus on controlling mosquito populations with pesticides. I'm guessing. The spread of resistance genes can delay efforts to prevent disease.
