Tag: logic gates

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Questions Related to logic gates

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

State whether true or false :
Bulk Modulus of Single Walled Nano Tube (SWNT) is lower than that of diamond. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The bulk modulus of single walled phase nanotubes is 462 to 546 GPa, even higher than that of diamond (420 GPa for single diamond crystal). This is because chemical bonding of nanotubes involves entirely $sp^{2}$ hybrid carbon atoms. These bonds, which are similar to those of graphite and are stronger than diamond (which employ $sp^{3}$ hybrid carbon atoms), this provides nanotubes with their unique strength.

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

Which of the following are possible due to nanotechnology ?

  1. Anti-aging drugs

  2. Super-fluidity at high temperatures

  3. 3-dimensional (3D) printing

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nanotechnology uses:

  1. Medicine: for chemotherapy and anti-ageing drugs
  2. Used in 3D printing
  3. Super fluidity at high temperature.

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

STM stands for :

  1. Simple Tunneling Microscope

  2. Scanning Tunneling Microscope

  3. Specific Tunneling Microscope

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

STM: Scanning Tunneling Microscope.
It is an instrument for imaging surfaces at the atomic level. It is based on the concept of Quantum tunneling. When a conducting tip is brought very near to surface to be examined, a potential difference applied between two can allow electrons to tunnel through the vacuum between them.

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

State whether true or false :
A paper thin sheet of cellulose infused with carbon nano-tubes act as highly efficient battery.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A paper battery is a battery made using a paper-thin sheet of cellulose infused with aligned carbon nano-tubes. It acts as a high energy battery. It provides long term, steady power production and burst of energy. These batteries are non-toxic, flexible and used in electronic, medical devices and new technologies.

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

Carbon nano-tubes are which type of fullerenes ?

  1. Spherical

  2. Cylindrical

  3. Cubical

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cylindrical fullerenes are also called carbon nanotubes or buckytubes. These are a form of carbon similar to graphite found in pencils. They are hollow cylindrical tubes and are 10,000 times smaller than a human hair.

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

"Fullerene" is made up of how many atoms ?

  1. 40

  2. 60

  3. 20

  4. 10
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  1. Fullerene is another form of carbon allotropes.
    2. It can be identified as $C-60$ since, it is made of $60$atoms, arranged in the shape of a football.
    3. Since, this look like the geodesic dome designed by the US archited Buckminster Fuller, the molecule was named Fullerence.
Multiple choice nanoscience and nanotechnology nanotechnology logic gates

Ultrahard Fullerites (crystalline form of $C _{60}$ fullerenes) are made under which of the following conditions ?

  1. High Pressure and Low Temperature

  2. Low Pressure and High Temperature

  3. High Pressure and High Temperature

  4. Low Pressure and Low Temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ultrahard Fullerites are made under high pressure 13 GPa and require high temperature for heating up to 1100 K (more than 820°C).

Multiple choice nanoscience and nanotechnology nanotechnology logic gates

The size of Red Blood Cells (RBCs) is around : 

  1. 1000 nm

  2. 2000 nm

  3. 5000 nm

  4. 9000 nm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Size of Red Blood Cells is around 6 to 8 microns. 
i.e. $6-8\times10^{-6}$ m.
So, out of options available, 5000 nm or 5 μm lies near this range. So answer is 5000 nm.

Multiple choice physics electronic devices boolean algebra digital electronics and logic gates logic gates

Which of the following is logically equivalent to $(p\wedge q)$ ?

  1. $p\rightarrow q$
  2. $\sim p \, \wedge \sim q$
  3. $p\, \wedge \sim q$
  4. $\sim (p\rightarrow \sim q)$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

By De Morgan's laws and logical implication rules, p and q is equivalent to not (p implies not q). p -> not q is equivalent to not p or not q. The negation is p and q.