Question Detail Which of the following is an electromagnetic wave ? Cathode raysSound waveUltrasonic waveInfra red rays Answer: Option D Similar Questions : 1. Nuclear sizes are expressed in a unit named FermiAngstromNewtonTesla Answer: Option A 2. Thomas Alva Edison invented CinemaCine CameraComputerCinematograph Answer: Option DExplanation:Thomas Alva Edison of USA invented Cinematograph in 1891, Cinema was invented by A.L. and J.L. Lumiere of France in 1895, Cine Camera was invented by Friese-Greene of Britain in 1889, Computer was invented by Charles Babbage of Britain in 1834, he is also known as Father of Computer. 3. Alfred Nobel invented X rayDiesel EngineDynamiteDynamo Answer: Option CExplanation:Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831. 4. Which instrument is used to measure the scattering of light by particles suspended in a liquid ? NephetometerOhmmeterOndometerPyrometer Answer: Option AExplanation:Ohmmeter - is used to measure electrical resistance in ohms, Ondometer - is used to measure frequency of electromagnetic waves, Pyrometer - is used to measure very high temperature. 5. Alexander Graham Bell invented TelephoneTelescopeTelevisionTank Answer: Option AExplanation:Alexander Graham Bell of USA invented Telephone in 1876, Telescope was invented by Hans Lippershey of Netherlands in 1608, Television was invented by John Logie Bared of Scotland in 1926, Tank was invented by Sir Ernest Swington of England in 1914. Read more from - Physics Questions Answers