During combustion of petrol in car engine, energy is converted in: Chemical Mechanical Electrical None of these
Radio waves broadcasted by Radio Broadcasting is reflected back by: Ionosphere Stratosphere Mesosphere None of these
Time interval to complete one revolution of earth around its own axis is: 22 hours 23 hours 24 hours 23 hours 56 minutes
Which distance is bigger – an astronomical unit (AU) or a light-year (LY)? An astronomical unit (AU) Neither one is a measurement of distance They're both about the same distance A light-year (LY)
