{"questions":[{"id":"matric-phy10-shm-01","v":1,"subject":"physics-10","chapter":"simple-harmonic-motion-and-waves","seed":true,"difficulty":1,"stem":"The time period of a simple pendulum depends on:","options":["The mass of the bob","The amplitude (for small swings)","The length of the pendulum","The material of the string"],"answer":2,"explain":{"en":"For small swings, T = 2π√(l/g): the period depends only on the length l and the acceleration due to gravity g, not on the mass of the bob or the amplitude.","ur":"چھوٹے جھولوں کے لیے T = 2π√(l/g): دورانیہ صرف لمبائی l اور ثقلی اسراع g پر منحصر ہے، گولے کے ماس یا ایمپلیٹیوڈ پر نہیں۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"matric"},{"id":"matric-phy10-shm-02","v":1,"subject":"physics-10","chapter":"simple-harmonic-motion-and-waves","difficulty":1,"stem":"The SI unit of frequency is the:","options":["Hertz","Second","Metre","Newton"],"answer":0,"explain":{"en":"Frequency is the number of vibrations per second; 1 hertz (Hz) = 1 vibration per second = 1 s⁻¹. The second is the unit of the time period.","ur":"فریکوئنسی فی سیکنڈ ارتعاشات کی تعداد ہے؛ 1 ہرٹز (Hz) = ایک ارتعاش فی سیکنڈ۔ سیکنڈ دورانیے کی اکائی ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"matric"},{"id":"matric-phy10-shm-03","v":1,"subject":"physics-10","chapter":"simple-harmonic-motion-and-waves","difficulty":2,"stem":"In simple harmonic motion, the acceleration of the body is:","options":["Constant","Directly proportional to displacement and opposite to it","Inversely proportional to displacement","Always zero"],"answer":1,"explain":{"en":"SHM is defined by a = −(constant) × x: acceleration is proportional to displacement from the mean position and always directed towards it. It is greatest at the extremes and zero at the mean position.","ur":"SHM کی تعریف a = −(مستقل) × x ہے: اسراع اوسط مقام سے ہٹاؤ کے متناسب اور ہمیشہ اسی کی طرف ہوتا ہے۔ یہ انتہائی مقام پر زیادہ اور اوسط مقام پر صفر ہوتا ہے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"matric"},{"id":"matric-phy10-shm-04","v":1,"subject":"physics-10","chapter":"simple-harmonic-motion-and-waves","difficulty":1,"stem":"Waves transfer:","options":["Matter only","Both matter and energy","Neither matter nor energy","Energy, without carrying matter along"],"answer":3,"explain":{"en":"In a wave, the particles of the medium only vibrate about their positions; it is the energy that travels onward. A floating leaf bobs up and down as water waves pass but does not travel with them.","ur":"لہر میں واسطے کے ذرات صرف اپنی جگہ پر ارتعاش کرتے ہیں؛ آگے توانائی جاتی ہے۔ پانی پر تیرتا پتا لہروں کے گزرنے پر اوپر نیچے ہوتا ہے مگر ساتھ نہیں جاتا۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"matric"},{"id":"matric-phy10-shm-05","v":1,"subject":"physics-10","chapter":"simple-harmonic-motion-and-waves","difficulty":1,"stem":"Sound waves travelling through air are:","options":["Transverse waves","Electromagnetic waves","Longitudinal waves","Stationary waves"],"answer":2,"explain":{"en":"Air particles vibrate back and forth along the direction the sound travels, forming compressions and rarefactions: longitudinal waves. Sound needs a medium; electromagnetic waves do not.","ur":"ہوا کے ذرات آواز کی سمت میں آگے پیچھے ارتعاش کرتے ہیں اور دباؤ اور پھیلاؤ کے حصے بناتے ہیں: طولی لہریں۔ آواز کو واسطہ چاہیے۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"matric"},{"id":"matric-phy10-shm-06","v":1,"subject":"physics-10","chapter":"simple-harmonic-motion-and-waves","difficulty":2,"stem":"A wave has a frequency of 50 Hz and a wavelength of 2 m. Its speed is:","options":["25 m/s","100 m/s","52 m/s","0.04 m/s"],"answer":1,"explain":{"en":"v = fλ = 50 × 2 = 100 m/s.","ur":"v = fλ = 50 × 2 = 100 m/s۔"},"source":{"kind":"parcha-original"},"status":"sample","exam":"matric"}]}