Prelims

Consider the following statements:
1. Carbon fibres are used in the manufacture of the components used in automobiles and aircrafts.
2. Carbon fibres once used cannot be recycled.
Which of the statements given above is/are correct?

Consider the following statements :
1. Other than those made by humans, nanoparticles do not exist in nature.
2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics.
3. Nanoparticles of some commercial products which enter the environment are unsafe for humans.
Which of the statements given above is/are correct ?

With reference to carbon nanotubes, consider the following statements:
(1) They can be used as carriers of drugs and antigens in the human body.
(2) They can be made into artificial blood capillaries for an injured part of human body.
(3) They can be used in biochemical sensors.
(4) Carbon nanotubes are biodegradable.
Which of the statements given above are correct?

With reference to the use of nano-technology in health sector, which of the following statements
is/are correct?
(1) Targeted drug delivery is made possible by nanotechnology.
(2) Nanotechnology can largely contribute to gene therapy.
Select the correct answer using the code given below.

Graphene is frequently in the 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.