CBSE  /  Class 10  /  Science  /  Our Environment

  • 1. 
    Which of the following is biodegradable waste?

  • DDT
  • Aluminium can
  • Plastic bag
  • Cow dung

  • 2. 
    Which of the two sets belong to the same trophic level?

  • Rabbit: Tiger
  • Vulture : Rat
  • Grasshopper : Hawk
  • Frog : Lizard

  • 3. 
    In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?

  • 6000 kJ
  • 20 kJ
  • 60 kJ
  • 600 kJ

  • 4. 
    Which of the following is the best way for disposal of vegetable and fruit peels?

  • Landfill
  • Recycling
  • Composting
  • Burning

  • 5. 
    The problem caused due to ozone hole is

  • earthquakes
  • damage due to UV radiations
  • chemical pollution
  • acid rain

  • 6. 
    An ecosystem includes

  • all living organisms
  • non-living objects
  • both living organisms and non-living objects
  • sometimes living organisms and sometimes non-living objects

  • 7. 
    Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

  • eutrophication
  • pollution
  • biomagnification
  • accumulation

  • 8. 
    In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of

  • heat energy
  • light energy
  • chemical energy
  • mechanical energy

  • 9. 
    Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called

  • decomposers
  • producers
  • herbivores
  • carnivores

  • 10. 
    Excessive exposure of humans to UV-rays results in

  • (i) and (ii)
  • (ii) and (iv)
  • (i) and (iii)
  • (iii) and (iv)
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