{"questions":[{"id":"mdcat-phy-wep-01","v":1,"subject":"physics","chapter":"work-energy-power","seed":true,"difficulty":1,"stem":"The SI unit of power is the:","options":["Joule","Newton","Watt","Pascal"],"answer":2,"explain":{"en":"Power is the rate of doing work: 1 watt = 1 joule per second. The joule is the unit of work and energy, the newton of force, and the pascal of pressure.","ur":"طاقت کام کرنے کی شرح ہے: 1 واٹ = 1 جول فی سیکنڈ۔ جول کام اور توانائی، نیوٹن قوت اور پاسکل دباؤ کی اکائی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-wep-02","v":1,"subject":"physics","chapter":"work-energy-power","difficulty":1,"stem":"When a force acts perpendicular to the displacement, the work done is:","options":["Maximum","Negative","Equal to the force","Zero"],"answer":3,"explain":{"en":"W = Fd cos θ. With θ = 90°, cos θ = 0, so no work is done. Example: the centripetal force on a body moving in a circle does no work.","ur":"W = Fd cos θ۔ θ = 90° پر cos θ = 0، اس لیے کام صفر ہے۔ مثال: دائرے میں حرکت کرتے جسم پر مرکز جو قوت کوئی کام نہیں کرتی۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-wep-03","v":1,"subject":"physics","chapter":"work-energy-power","difficulty":1,"stem":"The kinetic energy of a 2 kg mass moving at 3 m/s is:","options":["6 J","9 J","18 J","3 J"],"answer":1,"explain":{"en":"KE = ½mv² = ½ × 2 × 3² = 9 J.","ur":"KE = ½mv² = ½ × 2 × 3² = 9 J۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-wep-04","v":1,"subject":"physics","chapter":"work-energy-power","difficulty":2,"stem":"If the speed of a body is doubled, its kinetic energy becomes:","options":["Four times","Twice","Half","Unchanged"],"answer":0,"explain":{"en":"KE = ½mv² depends on v², so doubling v multiplies KE by 2² = 4.","ur":"KE = ½mv² رفتار کے مربع پر منحصر ہے، اس لیے رفتار دگنی کرنے سے KE چار گنا ہو جاتی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-wep-05","v":1,"subject":"physics","chapter":"work-energy-power","difficulty":2,"stem":"One kilowatt-hour (kWh) is equal to:","options":["1000 J","3.6 × 10³ J","3.6 × 10⁶ J","6.0 × 10⁴ J"],"answer":2,"explain":{"en":"1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J. It is the 'unit' on electricity bills.","ur":"1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J۔ بجلی کے بل کا 'یونٹ' یہی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"},{"id":"mdcat-phy-wep-06","v":1,"subject":"physics","chapter":"work-energy-power","difficulty":1,"stem":"A 10 kg box is lifted 2 m vertically. Taking g = 10 m/s², the gain in potential energy is:","options":["20 J","50 J","100 J","200 J"],"answer":3,"explain":{"en":"PE = mgh = 10 × 10 × 2 = 200 J.","ur":"PE = mgh = 10 × 10 × 2 = 200 J۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"mdcat"}]}