{"questions":[{"id":"ppsc-eds-basics-01","v":1,"subject":"everyday-science","chapter":"science-basics","seed":true,"difficulty":1,"stem":"The speed of light in a vacuum is about:","options":["3 × 10⁸ m/s","3 × 10⁶ m/s","340 m/s","3 × 10⁵ m/s"],"answer":0,"explain":{"en":"Light travels at about 3 × 10⁸ m/s (300,000 km/s) in a vacuum. 340 m/s is roughly the speed of sound in air.","ur":"خلا میں روشنی کی رفتار تقریباً 3 × 10⁸ m/s (تین لاکھ کلومیٹر فی سیکنڈ) ہے۔ 340 m/s ہوا میں آواز کی رفتار ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"ppsc"},{"id":"ppsc-eds-basics-02","v":1,"subject":"everyday-science","chapter":"science-basics","difficulty":1,"stem":"The pH of pure water at 25 °C is:","options":["0","5","7","14"],"answer":2,"explain":{"en":"Pure water is neutral, with pH 7 at 25 °C. Below 7 is acidic and above 7 is basic (alkaline).","ur":"خالص پانی معتدل ہے اور 25 °C پر اس کا pH 7 ہے۔ 7 سے کم تیزابی اور زیادہ اساسی (الکلائن) ہوتا ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"ppsc"},{"id":"ppsc-eds-basics-03","v":1,"subject":"everyday-science","chapter":"science-basics","difficulty":1,"stem":"Most of the ozone layer lies in the:","options":["Troposphere","Mesosphere","Thermosphere","Stratosphere"],"answer":3,"explain":{"en":"The ozone layer is in the stratosphere, roughly 15 to 35 km above the ground. It absorbs most of the Sun's harmful ultraviolet radiation.","ur":"اوزون کی تہہ اسٹریٹوسفیئر میں زمین سے تقریباً 15 سے 35 کلومیٹر اوپر ہے۔ یہ سورج کی زیادہ تر نقصان دہ بالائے بنفشی شعاعیں جذب کرتی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"ppsc"},{"id":"ppsc-eds-basics-04","v":1,"subject":"everyday-science","chapter":"science-basics","difficulty":1,"stem":"The most abundant gas in Earth's atmosphere is:","options":["Oxygen","Nitrogen","Carbon dioxide","Argon"],"answer":1,"explain":{"en":"Dry air is about 78% nitrogen, 21% oxygen and 0.9% argon; carbon dioxide is only about 0.04%.","ur":"خشک ہوا میں تقریباً 78 فیصد نائٹروجن، 21 فیصد آکسیجن اور 0.9 فیصد آرگن ہے؛ کاربن ڈائی آکسائیڈ صرف تقریباً 0.04 فیصد ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"ppsc"},{"id":"ppsc-eds-basics-05","v":1,"subject":"everyday-science","chapter":"science-basics","difficulty":1,"stem":"The SI unit of electric current is the:","options":["Volt","Ohm","Ampere","Watt"],"answer":2,"explain":{"en":"Current is measured in amperes (A), one of the seven SI base units. The volt measures potential difference, the ohm resistance, and the watt power.","ur":"برقی رو ایمپیئر (A) میں ناپی جاتی ہے جو ایس آئی کی سات بنیادی اکائیوں میں سے ہے۔ وولٹ پوٹینشل فرق، اوہم مزاحمت اور واٹ طاقت کی اکائی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"ppsc"},{"id":"ppsc-eds-basics-06","v":1,"subject":"everyday-science","chapter":"science-basics","difficulty":1,"stem":"At sea level, pure water boils at:","options":["90 °C","100 °C","110 °C","120 °C"],"answer":1,"explain":{"en":"At standard sea-level pressure, pure water boils at 100 °C. At higher altitudes the air pressure is lower, so water boils at a lower temperature (that is why cooking is slower in the mountains).","ur":"سطح سمندر پر خالص پانی 100 °C پر ابلتا ہے۔ بلندی پر ہوا کا دباؤ کم ہوتا ہے اس لیے پانی کم درجہ حرارت پر ابلتا ہے (اسی لیے پہاڑوں پر کھانا دیر سے پکتا ہے)۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"ppsc"}]}