Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry fibre to fabric: plant fibre yarn to fabric from fibre to fabric processing of fibres

The ginning of cotton is the process of separation of fibres from the seeds by combing.

  1. True

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

The ginning of cotton is the process of separation of fibres from the seeds by combing.
From the bolls, cotton is usually picked by hand. Fibres are then separated from the seeds by combing. This process is called ginning of cotton.

Multiple choice chemistry fibre to fabric: plant fibre yarn to fabric from fibre to fabric processing of fibres

Wrap yarn consists of:

  1. Only two ends

  2. Multiple ends

  3. Single End

  4. No end
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Warp Yarn is that kind of yarn from which we can get multiple ends of yarn from a given package. While the wept yarn is that in which we have a single end . The end means thread-like thing. ie from a package of warp we can unwind multiple threads at a time while not in case of wept.

Hence, the correct option is $\text{C}$

Multiple choice chemistry fibre to fabric: plant fibre yarn to fabric from fibre to fabric processing of fibres

The process of extracting fibers from cotton seeds in preparation for making yarn includes ginning, carding, and combing.

  1. True

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

True, 

Ginning is a process in which cotton fibre is separated from cotton seeds. Carding is a mechanical process that disentangles, cleans and intermixes fibres to produce a continuous web or sliver suitable for subsequent processing. This is achieved by passing the fibers between differentially moving surfaces covered with card clothing. 
After this, cotton is combed when it is to be used for quality fabric with high thread counts. In general, combing is done to filter or sieve out any short length fibers (for example, fibers shorter than 21 mm).

Multiple choice chemistry fibre to fabric: plant fibre yarn to fabric from fibre to fabric processing of fibres

The process of formation of yarn from the unseeded cotton fibre is called as:

  1. Spinning

  2. Ginning

  3. Weaving

  4. Knitting
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The unseede cotton fibre got from the ginning process is subjected to spinning process to make it as yarn.The process of formation of yarn from the unseeded cotton fibre is called as spinning.
Hence option A is correct.

Multiple choice chemistry lattice energy born-haber cycle born-haber cycles energy cycles

Which of the following can be calculated from Born-Haber cycle for $Al _2O _3$?

  1. Lattice energy of $Al _2O _3$

  2. Electron affinity of O-atom

  3. Ionisation energy of Al

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

 The Born-Haber Cycle can be applied to determine the lattice energy of an ionic solid; ionization energy, electron affinity, dissociation energy, sublimation energy, heat of formation, and Hess's Law.