276. Plane ki awaaz hame plane ke chale jane ke baad kyo sunai deti hai Kyonki Prakash ki gati Awaaz ki gati se jyada tej hoti hai 277. Traffic Signal ki shuruwat sabse pahle kisne ki thi Railway ne 278. Bharat me TV par sabse pahle samachar kisne pade the Partimapuri Ne 279. Pen Drive ka Avishkaar kisne kiya tha April 1999 me M-System ne 280. Rocket hamesha Pashchim se Purv ki aur hi kyo chhoda jata hai Kyonki dharti Pashchim se Purv ki aur ghoomti hai iss liye jab Rocket ko jab purv ki aur chhoda jata hai to uska veg dharti ke veg se jud jata hai iss se urja ki bachat hoti hai aur Rocket dharti ke gurutwakarshan ko bhi aasani se paar kar leta hai