Practice Test | Kullabs.com
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  • Acid rain is formed when carbon dioxide (CO2) and Nitrogen dioxide (NO2) react with ______.

    water
    carbon
    oxygen
    acid
  • Smog is formed when the smoke coming out of vehicle and industries mix with the ______.

    air
    carbondioxide
    oxygen
    fog
  • Which is the cause of pollution?

    dust
    all of the above
    smoke
    bacteria
  • An undesirable change in the ______characteristics of air is called pollution.

    biological
    physical
    all of the answers are correct.
    chemical
  • Rust is formed when iron reacts with ______ in the presence of water.

    oxidizes
    nytrogen
    oxygen
    carbon
  • Incomplete burning of petrol or diesel in vehicles creates ______ gas which is very poisonous.

    ozone
    carbon monoxide
    methane
    carbon dioxide
  • Combustion of coal in power plant produces mainly ______ which is a major pollutant of air.

    methane
    carbon dioxide
    carbon monoxide
    nitrogen dioxide
  • Which gas is responsible for depletion of the ozone layer around the earth which protects us from harmful?

    Hydrogen
    Methane
    Oxygen
    Chloroflurocarbon
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