Tag: centrifugation

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Questions Related to centrifugation

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

Which of the following is a better method than filtration for separation of very small solids?

  1. Distillation

  2. Chromatography

  3. Separating funnel

  4. Centrifugation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sometimes the solid particles in a liquid are very small and can pass through a filter paper. For such particles, the filtration technique cannot be used for separation. Such mixtures are separated by centrifugation.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

The centrifuge consists of a centrifuge tube holder called :

  1. motor

  2. rotor

  3. moving tube

  4. both a and b
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The apparatus used for centrifugation is called a centrifuge. The centrifuge consists of a centrifuge tube holder called rotor. The rotor holds balanced centrifugal tubes of equal amounts of the solid-liquid mixture.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with a centrifuge used in industry.

  1. True

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

Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with a centrifuge used in industry and in laboratory settings. This process is used to separate two immiscible liquids.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

Which of the following processes is used to separate cream from milk?

  1. Filtration

  2. Distillation

  3. Chromatography

  4. Centrifugal separator
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The separation of cream from milk in the centrifugal separator is based on the fact that when liquids of different specific gravities revolve around the same centre at the same distance with the same angular velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk can be regarded as two liquids of different specific gravities, the serum and the fat.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

What type of mixture are separated by centrifugation?

  1. Separating chalk powder from water

  2. Removing fat from milk to produce skimmed milk

  3. Separating water from textiles

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

Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with a centrifuge, used in industry and in laboratory settings. This process is used to separate two immiscible liquids.
Uses:

  • Separating chalk powder from the water.
  • Removing fat from milk to produce skimmed milk.
  • Separating water from textiles
  • Removing water from lettuce after washing it in a salad spinner.
  • Separating particles from an air-flow using cyclonic separation.
  • The clarification and stabilization of wine.
  • Separation of water particles from clothes while spin-drying in washing machines.
  • Separation of urine components and blood components in forensic and research laboratory.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter

Which of the following devices uses the principle of centrifugation?

  1. Washing machine

  2. Ceramic water filter

  3. Household ultraviolet (UV) purifier

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

Centrifugation is a technique which involves the application of centrifugal force to separate particles from a solution according to their size, shape, density, the viscosity of the medium and rotor speed. The larger the size and the larger the density of the particles, the faster they separate from the mixture. Example- washing machine works on the principle of centrifugation.

Multiple choice bio-chemistry biochemical techniques centrifugation separation techniques separation of matter
A very large quantity of mixture contains tiny particles of three different substances X, Y, and Z. They are of the same size, cubical in shape and yellow in colour. X particles are very heavy, insoluble, non-magnetic and contribute 50% of the mixture. Y particles are very light, insoluble, non-magnetic and contribute 40% of the mixture. And Z particles are actually iron pieces. Which of the following methods can separate X, Y?

  1. Distillation

  2. Decantation

  3. Centrifugation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Particle X and Y are having same size, shape and colour but they are having different masses, 

particle X is heavy whereas particle Y is light,
so, based on this particle X and Y can be separated by centrifugation.