Q.21)-Matter waves are
  • de Broglie waves
  • Electromagnatic waves
  • Transverse waves
  • Longitudinal waves
Q.22)-Which electromagnetic radiation is used for setellite communication?
  • Ultraviolet
  • Infrared
  • Microwave
  • Millimeter wave
Q.23)-The radiation initially produced in fluorescent tube is
  • Infrared
  • Ultraviolet
  • Microwaves
  • X-Rays
Q.24)-Waves that are required for long distance wireless communication are
  • Infrared Rays
  • Ultraviolet Rays
  • Radio waves
  • Microwaves
Q.25)-Ultra violet raditations of the sun do not reach the earth because, earth's atmosphere is surrounded by
  • Carbon dioxide
  • Ammonia
  • Chlorine
  • Ozone
Q.26)-Gamma rays can cause
  • Gene mutation
  • Sneezing
  • Iodine
  • Sodium chloride
Q.27)-Ultraviolet radiations has more energy as compare to-
  • Infrared Radiation
  • Gamma Radiation
  • X-Rays
  • Space Rays
Q.28)-Ultraviolet rays can be used in water treatment as
  • Precipitator
  • Hydrolyser
  • Disinfectant
  • Flocculator
Q.29)-The device used for measuring the wavelength of X-rays is:
  • Cyclotron
  • Bragg's Spectrometer
  • Mass spectrometer
  • GM counter
Q.30)-Radar is used to-
  • To locate submerged submarines
  • Receive signal from radio receivers
  • Detect and locate distant objects
  • Locate geostationary satellites