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    A team of scientists at Brookhaven National Laboratory including those from India created the
    heavies anti-matter (anti-helium nucleus) What is/are the implications of the creation anti-matter?
    • 1. It will make mineral prospecting and oil exploration easier and cheaper.
    • 2. It will help probe the possibility of the existence of stars a galaxies made of anti-matter.
    • 3. It will help understand evolution of the universe.
    Select the correct answer using codes given below:

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

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Consider the following statements:
Chlorofluorocarbons, known as ozone-depleting substances, are used
  • 1. In the production of plastic foams
  • 2. In the production of tubeless tyres
  • 3. In cleaning certain electronic components
  • 4. As pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
With reference to ‘stem cells’, frequently in the news, which of the following statements is/are
correct?
  • 1. Stem cells can be derived from mammals only.
  • 2. Stem cells can be used for screening new drugs.
  • 3. Stem cells can be used for medical therapies.
Select the correct answer using the codes given below:
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:
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?

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