Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the earth. What prevents them from reaching the surface of the earth?

Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe?

1. Detection of microwaves in space

2. Observation of redshirt phenomenon in space

3. Movement of asteroids in space

4. Occurrence of supernova explosions in space code

Which is correct?

A team of scientists at Brookhaven National Laboratory including from India created the heaviest anti-matter (anti-helium nucleus). What is/are the implications of the creation of 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 and galaxies made of anti matter.

3. It will help understand the evolution of the universe.

Select the correct answer using the codes given below:

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:

Graphene is frequently in news recently. What is its important?

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’ requires for touch screens, LCD’s and organic LED’s

Which of the statements given above are correct?