Tag: centrifugation

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

Mark the statement which is not a significant application of centrifugation.

  1. Used in squeezing clothes in washing machines

  2. Used for seperating cream from milk

  3. Used in laboratories for testing blood/urine

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

The particles which are very small and can easily pass through can be separated by centrifugation. In this, the denser particles settle down and the lighter particles stay at the top.
Hence, all the options are the applications of centrifugation. In this method, suspended particles is rotated at a high speed in a centrifuge.

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

What is the difference between full cream milk, standard milk, toned, double toned milk?

  1. Amount of fat

  2. Difference in colour

  3. Difference in type of centifugation method used

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

Milk with different fat contains is available in the market. Full cream milk contains 6% of fat. Standard milk contains 3% fat double and toned milk contains 1% fat.

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

Nowadays we get full cream, toned and double-toned varieties of milk placed in polypacks or tetra packs in the market. What is the basic concept behind this?

  1. Distillation

  2. Centrifugation

  3. Decantation

  4. Sedimentation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Centrifugation method is also used for separating cream from milk. When milk is rotated at high speed, the cream collects at the centre and is removed through an outlet.

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

Centrifugation is used for :
(a) particles which can't be seperated by filteration.
(b) particles which pass through a filter paper.
(c) seperating cream from milk.

  1. a, b, c

  2. a, b

  3. a, c

  4. b, c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Centrifugation is a technique of separation cream from milk. This is used for particles which are very small and can easily pass through filter paper for particles which can't be seperated by filtration.

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

In centrifugation :

  1. denser particles settle down

  2. lights particles stay at it top

  3. there are no distinction between lights or denser particles

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In centrifugation, denser particles settle down at the bottom of it container and the lighter particles stay at the top. Suspended particles are rotated at a high speed.

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

Principle of centrifugation is :

  1. denser particles stay at the top and the lighter particles are forced to the bottom

  2. lighter particle stay at the top and the denser particles are forced to the bottom

  3. high speed rotation increases the velocity of particles and make them charged

  4. particles become weightless due to high speed rotation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The principle behind centrifugation is that the denser particles are forced to the bottom and the lighter particles stay at it top when spin rapidly.

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

A ___________ is a centrifugal device that separates milk into cream and skimmed milk.

  1. condenser

  2. sublime

  3. separator

  4. all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A separator is a centrifugal device that separates milk into cream and skimmed milk. When spun, the heavier milk is pulled outward against the walls of the separator and the cream, which is lighter, collects in the middle.

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

Blood cells are separated from plasma (the liquid part of blood) by :

  1. distillation

  2. centrifugation

  3. sedimentation

  4. chromatography
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A centrifuge is a spinning machine, a bit like a clothes dryer, that separates materials. A mixture of liquids and solids is spun at high speed in a tube. The larger, denser particles sink and collect at the bottom. Light particles collect at the top. Blood cells are separated from plasma (the liquid part of blood) by this method.

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

Butter from curd can be removed by :

  1. sedimentation

  2. centrifugation

  3. filteration

  4. all of above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the method of centrifugation, the centripetal and centrifugal forces are used to separate lighter and heavier components of mixture of two immiscible liquids. When curd is centrifuged, water which is lighter than fat, migrates away from the centre of centrifuge while fat is forced towards the bottom, which is drained out.