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    Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned,
    what still are the sources of lead poisoning?
    • 1. Smelting Units
    • 2. Pens and pencils
    • 3. Hair oils and cosmetics
    • 4. Paints
    Select the correct answer using the codes given below:

  • 1, 2 and 3 only
  • 1 and 3 only
  • 2 and 4 only
  • 1, 2, 3 and 4

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Graphene is frequently in news recently. What is its importance?
  • 1. It is a two-dimensional material and has good electrical conductivity.
  • 2. It is one of the thinnest but strongest materials tested so far.
  • 3. It is entirely made of silicon and has high optical transparency.
  • 4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
What is the role of ultraviolet (UV) radiation in the water purification systems?
  • 1. It inactivates/kills the harmful microorganism in water.
  • 2. It removes all the undesirable odours from the water.
  • 3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?
Consider the following kinds of organisms:
  • 1. Bacteria
  • 2. Fungi
  • 3. Flowering Plants
Some species of which of the above kinds of organisms are employed as biopesticides?
EEG is used to study the function of :
The concept that all plants are made of cells was put forward by :

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