Tag: materials

Questions Related to materials

What are the dimensions of nanomaterials?

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  1. Between 1 nm and 100 nm

  2. Between 100 nm and 10000 nm

  3. Between 0.01 nm and 1 nm

  4. Between 1 $\mu$m and 100 $\mu$m

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Correct Option: A
Explanation:

Nanomaterials have atleast one dimension between 1 nm and 100 nm.

Which of the following are applications of Nano particles?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Targeted drugs may be developed

  2. Various routes of administration including oral, nasal, injection, intra-ocular (within the eyes) etc. can be used.

  3. The size and surface characteristics of nanoparticles can be easily manipulated. This could be used for both passive and active drug targeting

  4. All of the above

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Correct Option: D
Explanation:
  • The size and surface characteristics of nanoparticles can be easily
    manipulated. This could be used for both passive and active drug targeting
  • Nanoparticles can be made to control and sustain release of the drug during the transportation as well as the location of the release.
    Since distribution and subsequent clearance of the drug from the body
    can be altered, an increase in drug therapeutic efficacy and reduction in side effects can be achieved.
  • Choosing an appropriate matrix also helps in increasing the efficacy and reducing side effects
  • Targeted drugs may be developed
  • Various routes of administration including oral, nasal, injection, intra-ocular (within the eyes) etc. can be used.
  • Hence option D is correct.

Carbon nano tubes are made up of:

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  1. carbon nano particle

  2. carbon atoms

  3. compounds containing carbon atoms

  4. none of the above

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Correct Option: A,B
Explanation:

Carbon nano tubes are made up of carbon nano particles. Example: Fullerene is the allotrope of carbon. It is also a nanomaterial. The cylindrical fullerene is called as carbon nano tube. 

Which of the following are production  methods of nanomaterials?

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  1. Top-Down method

  2. Bottom-Up method

  3. Down-Top method

  4. A,B only

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Correct Option: D
Explanation:

Nanomaterials are not simply another step in the miniaturization of  materials or particles. They often require very different production approaches. There are several processes to create various sizes of nanomaterials, classified as top-down and bottom-up. Although large numbers of nanomaterials are currently at the laboratory stage of manufacture, many of them already are being commercialized. Hence option D is correct.

The size of a nano particle is ____________ of a typical bacterium.

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  1. 10 times that

  2. 1000 times

  3. 1/100th

  4. one millionth

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Correct Option: C
Explanation:

The size of a nanoparticle is  about 50000 times smaller than the diameter of a single strand of human hair and 1/100th of a typical bacterium.

Which of the following statement(s) is true?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. Nanomaterials have different colours than the bulk material.

  2. Gold nanoparticles are red.

  3. Bulk gold metal is yellow.

  4. All of the above

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Correct Option: D
Explanation:

All of the given statements are true. Nano materials have different colours than the bulk material. Gold nano particles are red. Bulk gold metal is yellow.

Nanoparticles are the nanomaterials with ____ dimension(s) between 1 nm and 100 nm.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. one

  2. two

  3. three

  4. either one or two

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Correct Option: C
Explanation:

Nanoparticles are the nanomaterials with three dimension between 1 nm and 100 nm. Nanolayers are the nanomaterials with only one dimension between 1 nm and 100 nm. Nanotubes or nanowires are the nanomaterials with two dimension between 1 nm and 100 nm.

Which of the following is/are true?

nanochemistry nanotechnology applied chemistry materials chemistry

  1. The nanoparticles have substantial percentage of atoms on the surface and are therefore bound less tightly than those within the bulk solid.

  2. The nanomaterials have lower melting points than the bulk material.

  3. The nanomaterials tend to have greater reactivity than the bulk material.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

All of the given statements are true.
The nanoparticles have substantial percentage of atoms on the surface and are therefore bound less tightly than those within the bulk solid. For example, a 5 nm nanoparticle has about 30%  of the atoms on its surface. This property of nanoparticles is responsible for the lower melting point and greater reactivity of nanomaterials than the bulk solid.

1 nm is the width of __________ hydrogen atoms placed side by side.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. 2

  2. 4

  3. 10

  4. 50

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Correct Option: B
Explanation:

1 nm is the width of 4 hydrogen atoms placed side by side.

The size of nano materials lies between the width of ______ hydrogen atoms laid side by side.

nanochemistry nanotechnology applied chemistry materials chemistry

  1. 1-5

  2. 4-25

  3. 100-150

  4. 1000-5000

Show answer
Correct Option: B
Explanation:

The size of nanomaterials lies between the width of 4-25 hydrogen atoms laid side by side. 1 nm is the width of 4 hydrogen atoms placed side by side. Nanomaterials have atleast one dimension between 1 nm and 100 nm.