Study

Gases

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  • Smoke from burning rubbish is an example of what?
    Clean air
    Water vapour
    Air pollution
  • Which variable should be kept the same (controlled) in an air pollution investigation?
    Number of cars
    Distance from road
    Type of measuring tool
  • Which gas increases in the air when many cars are on the road?
    Nitrogen
    Carbon dioxide
    Oxygen
  • Why is nitrogen the most common gas in the air?
    It is heavy
    Plants make it
    It does not react easily
  • Why is air important to living things?
    It contains gases needed for life
    It is colourful
    It is heavy
  • Which activity causes air pollution?
    Rainfall
    Planting trees
    Burning fuels
  • Which place is likely to have the most air pollution?
    Park
    Busy road
    Forest
  • What happens when we breathe out?
    Oxygen enters the body
    Carbon dioxide leaves the body
    Nitrogen is used by lungs
  • Which gas is released when fuels like petrol are burned?
    Nitrogen
    Carbon dioxide
    Oxygen
  • When measuring air pollution, what is the dependent variable?
    Type of place
    Time of day
    Amount of pollution
  • Cigarette smoke is harmful because it ____
    Has oxygen
    Contains clean gases
    Contains toxic chemicals
  • When testing air pollution near roads, what is the independent variable?
    Pollution level
    Weather
    Location
  • What happens when we breathe in?
    Oxygen enters the lungs
    Carbon dioxide enters the lungs
    Oxygen leaves the body
  • Which gas do humans need to breathe in to stay alive?
    Oxygen
    Nitrogen
    Carbon dioxide
  • What gas makes up most of the air we breathe?
    Nitrogen
    Oxygen
    Carbon dioxide
  • Which of these is a source of air pollution?
    Cigarette smoke
    Wind
    Fresh air
  • Which of these is a harmful air pollutant?
    Nitrogen
    Oxygen
    Smoke
  • What happens to air quality when pollution increases?
    It becomes cleaner
    It stays the same
    It becomes worse
  • Which of these helps reduce air pollution?
    Burning rubbish
    More cars
    Planting trees
  • Why should scientists control variables in an experiment?
    To get accurate results
    To finish faster
    To make it unfair
  • Why is breathing polluted air harmful?
    It makes air heavier
    It helps lungs work better
    It can damage lungs
  • Which tool can be used to observe air pollution levels?
    Air quality sensor
    Thermometer
    Rain gauge
  • Which gas do we breathe out?
    Nitrogen
    Oxygen
    Carbon dioxide
  • Fumes from spray cans can pollute the air because they contain ____
    Water droplets
    Chemicals
    Oxygen
  • Which gas helps plants make food during photosynthesis?
    Nitrogen
    Oxygen
    Carbon dioxide
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