Questions
Mark the statement which is not a significant application of centrifugation.
- Used in squeezing clothes in washing machines
- Used for seperating cream from milk
- Used in laboratories for testing blood/urine
- All of the above are application of centrifugation
What is the difference between full cream milk, standard milk, toned, double toned milk?
- Amount of fat
- Difference in colour
- Difference in type of centifugation method used
- None of the above
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?
- Distillation
- Centrifugation
- Decantation
- Sedimentation
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.
- a, b, c
- a, b
- a, c
- b, c
In centrifugation :
- denser particles settle down
- lights particles stay at it top
- there are no distinction between lights or denser particles
- Both A and B
In centrifugation, the mixture containing suspended particles are rotated :
- at very slow speed
- at high speed
- at moderate speed
- it varies
Principle of centrifugation is :
- denser particles stay at the top and the lighter particles are forced to the bottom
- lighter particle stay at the top and the denser particles are forced to the bottom
- high speed rotation increases the velocity of particles and make them charged
- particles become weightless due to high speed rotation
A ___________ is a centrifugal device that separates milk into cream and skimmed milk.
- condenser
- sublime
- separator
- all of the above
Blood cells are separated from plasma (the liquid part of blood) by :
- distillation
- centrifugation
- sedimentation
- chromatography
Butter from curd can be removed by :
- sedimentation
- centrifugation
- filteration
- all of above
Which of the following is a better method than filtration for separation of very small solids?
- Distillation
- Chromatography
- Separating funnel
- Centrifugation
The centrifuge consists of a centrifuge tube holder called :
- motor
- rotor
- moving tube
- both a and b
In analytical ultracentrifuges the maximum speed is:
- $70000\ rpm$
- $7000\ rpm$
- $700000\ rpm$
- $1000\ rpm$
The subcellular organelles of a cell suspension can be isolated by __________________ technique.
- centrifugation
- distillation
- chromatography
- none of the above
Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with a centrifuge used in industry.
- True
- False
Which of the following processes is used to separate cream from milk?
- Filtration
- Distillation
- Chromatography
- Centrifugal separator
What type of mixture are separated by centrifugation?
- Separating chalk powder from water
- Removing fat from milk to produce skimmed milk
- Separating water from textiles
- All of these
Which of the following devices uses the principle of centrifugation?
- Washing machine
- Ceramic water filter
- Household ultraviolet (UV) purifier
- Distillation tower
- Distillation
- Decantation
- Centrifugation
- None of the above
The method that is used to separate water particles from clothes while drying in washing machines is:
- magnetic separation
- filtration
- evaporation
- centrifugation
If the constituents of a solid-liquid mixture have different masses, then we can separate them using:
- sublimation
- centrifugation
- winnowing
- evaporation
Which of the following devices uses the process of centrifugation?
- Washing machine
- Ceramic water filter
- Household ultraviolet (UV) purifier
- Distillation tower
Centrifugation is used for :
- separation of miscible liquids
- separation of immiscible liquids
- separation of immiscible gases
- all of above
Centrifugation is a process which involves the application of the :
- centripetal force
- gravitational force
- friction
- none of above
When milk is churned rapidly, _______ migrates away from the centre of centrifuge.
- fat
- protein
- water
- sugar
Which of the following is an application of centrifugation?
- Pathological test of blood and urine
- Preparing lactic cultures
- Washing machine
- All of above
In a centrifuge, more-dense components of the mixture_____of the centrifuge, while less-dense components of the mixture ______.
- migrate away from the axis, migrate towards the axis
- migrate towards the axis, migrate away from the axis
- both a and b
- none of above
Centrifuge can be used to separate ___________.
- oil and water
- mixture of solids
- two forms of uranium
- all of the above
What forces out the water from fabric in washing machine?
- Magnetic force
- Frictional force
- Force of attraction
- Centrifugal force
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:
- Thin piece of cloth
- Centrifuge
- Filter paper
- Parchment paper