What is the role of ultraviolet (UV) radiation in the water purification systems?

1. It inactivates/kills the harmful microorganisms 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?

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?

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:

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?

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:

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?

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?

The metal used in storage batteries :

The energy in stars is produced by :

Light Year is

Freon gas is used in :

The prepration of soap involves the process called :

The constituent of blood associated with resistance to disease is :

Radioactive Disintegreation of Uranium ultimately leads to :

Increase of carbon dioxide in the atmosphere causes: