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?

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?

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 bio pesticides?

Which of the following can be threats to the biodiversity of a geographical area?

1. Global warming

2. Fragmentation of habitat

3. Invasion of alien species

4. Promotion of vegetarianism

Select the correct answer using the codes given below:

The Millenium Ecosystem Assessment describes the following major categories of ecosystem services-provisioning, supporting, regulating, preserving and cultural. Which one of the following is supporting service?

Consider the following statements:

If there were no phenomenon of capillarity

1. it would be difficult to use a kerosene lamp

2. one would not be able to use a straw to consume a soft drink

3. the blotting paper would paper would fail to function

4. the big trees that we see around would not have grown on the earth

Which of the following statements given above are correct?