Centrifugation - class-X

centrifugation

30 Questions Published

Questions

Question 1 Multiple Choice (Single Answer)

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
Question 2 Multiple Choice (Single Answer)

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
Question 3 Multiple Choice (Single Answer)

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
Question 4 Multiple Choice (Single Answer)

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
Question 5 Multiple Choice (Single Answer)

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
Question 6 Multiple Choice (Single Answer)

In centrifugation, the mixture containing suspended particles are rotated :

  1. at very slow speed
  2. at high speed
  3. at moderate speed
  4. it varies
Question 7 Multiple Choice (Single Answer)

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
Question 8 Multiple Choice (Single Answer)

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

  1. condenser
  2. sublime
  3. separator
  4. all of the above
Question 9 Multiple Choice (Single Answer)

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

  1. distillation
  2. centrifugation
  3. sedimentation
  4. chromatography
Question 10 Multiple Choice (Single Answer)

Butter from curd can be removed by :

  1. sedimentation
  2. centrifugation
  3. filteration
  4. all of above
Question 11 Multiple Choice (Single Answer)

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
Question 12 Multiple Choice (Single Answer)

The centrifuge consists of a centrifuge tube holder called :

  1. motor
  2. rotor
  3. moving tube
  4. both a and b
Question 13 Multiple Choice (Single Answer)

In analytical ultracentrifuges the maximum speed is:

  1. $70000\ rpm$
  2. $7000\ rpm$
  3. $700000\ rpm$
  4. $1000\ rpm$
Question 14 Multiple Choice (Single Answer)

The subcellular organelles of a cell suspension can be isolated by __________________ technique.

  1. centrifugation
  2. distillation
  3. chromatography
  4. none of the above
Question 15 Multiple Choice (Single Answer)

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
Question 16 Multiple Choice (Single Answer)

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

  1. Filtration
  2. Distillation
  3. Chromatography
  4. Centrifugal separator
Question 17 Multiple Choice (Single Answer)

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
Question 18 Multiple Choice (Single Answer)

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
Question 19 Multiple Choice (Single Answer)
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
Question 20 Multiple Choice (Single Answer)

The method that is used to separate water particles from clothes while drying in washing machines is:

  1. magnetic separation
  2. filtration
  3. evaporation
  4. centrifugation
Question 21 Multiple Choice (Single Answer)

If the constituents of a solid-liquid mixture have different masses, then we can separate them using:

  1. sublimation
  2. centrifugation
  3. winnowing
  4. evaporation
Question 22 Multiple Choice (Single Answer)

Which of the following devices uses the process of centrifugation?

  1. Washing machine
  2. Ceramic water filter
  3. Household ultraviolet (UV) purifier
  4. Distillation tower
Question 23 Multiple Choice (Single Answer)

Centrifugation is used for :

  1. separation of miscible liquids
  2. separation of immiscible liquids
  3. separation of immiscible gases
  4. all of above
Question 24 Multiple Choice (Single Answer)

Centrifugation is a process which involves the application of the :

  1. centripetal force
  2. gravitational force
  3. friction
  4. none of above
Question 25 Multiple Choice (Single Answer)

When milk is churned rapidly, _______ migrates away from the centre of centrifuge.

  1. fat
  2. protein
  3. water
  4. sugar
Question 26 Multiple Choice (Single Answer)

Which of the following is an application of centrifugation?

  1. Pathological test of blood and urine
  2. Preparing lactic cultures
  3. Washing machine
  4. All of above
Question 27 Multiple Choice (Single Answer)

In a centrifuge, more-dense components of the mixture_____of the centrifuge, while less-dense components of the mixture ______.       

  1. migrate away from the axis, migrate towards the axis
  2. migrate towards the axis, migrate away from the axis
  3. both a and b
  4. none of above
Question 28 Multiple Choice (Single Answer)

Centrifuge can be used to separate ___________.

  1. oil and water
  2. mixture of solids
  3. two forms of uranium
  4. all of the above
Question 29 Multiple Choice (Single Answer)

What forces out the water from fabric in washing machine?

  1. Magnetic force
  2. Frictional force
  3. Force of attraction
  4. Centrifugal force
Question 30 Multiple Choice (Single Answer)

Colloids may be more than a thousand times as big as an atom but are more than a thousand times smaller than an ant. These colloids can be removed from a solution by:

  1. Thin piece of cloth
  2. Centrifuge
  3. Filter paper
  4. Parchment paper