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    Which of the following is/are by the scientists as evide evidences for the continued expansion of
    universe?
    • 1. Detection of microwave space
    • 2. Observation of redshift phenomenon in space
    • 3. Movement of asteroids in space
    • 4. Occurrence of sup explosions in space
    Select the correct answer use codes given below:

  • 1 and 2
  • 2 only
  • 1, 3 and 4
  • None of the above can as evidence

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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:
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?

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