ROYAL PUBLIC SCHOOL
SECTOR – IV / B.S.CITY / SESSION 2016 -17
ASSIGNMENT WORK
Class – VI
Sub – Science
Topic – 5.SEPARATION OF MIXTURES
MULTIPLE CHOICE QUESTIONS
1. The method of separation used to separate stones from rice is
a. Handpicking
b. Threshing
c. Winnowing
d. Any of these
2. The separation of grains from husk is done by the process of
a. Handpicking
b. Sieving
c. Winnowing
d. threshing
3. Salt is obtained from sea water mainly by the process of :
a. Decantation
b. Filtration
c. Evaporation
d. condensation
4. Sand and iron-filings in water can be separated by the process of:
a. Magnetic separation and filtration
b. Filtration and evaporation
c. Decantation and evaporation
d. Condensation and filtration
5. Chalk powder suspension in water can be separated by:
a. Filtration
b. Condensation
c. Evaporation
d. decantation
6. Identify the substance from the following:
a. Copper
b. Orange juice
c. Soil
d. Air
7. Identify the mixture from the following:
a. Soil
b. Copper
c. Iron
d. Water
8. The method of hand picking is used only when one of the component is:
a. Present in small quantities
b. Differs in shape of size so that it can be picked up manually
c. Differs in colour
d. All of these
9. Which of the following process is used to separate grain from stalks?
a. Threshing
b. Winnowing
c. Sieving
d. Sedimentation
10. The substances containing more than one type of substances are called:
a. Mixtures
b. Pure substances
c. Both of these
d. None of these
11. The separation of substances is done to :
a. Remove the unuseful or harmful component
b. Remove impurities for getting a pure sample
c. Obtain the useful component
d. Improve the quality of the substance
12. The choice of methods for separating a mixture into its constituents depends upon:
a. Nature of the constituents
b. Properties of the constituents
c. None of these
d. Both of these
13. Mixture of salt, water and sand can be separated by using:
a. More than one method
b. Sedimentation method alone
c. Filtration method alone
d. Evaporation method alone
FILL IN THE BLANKS.
1. Pure liquid is obtained from the solution by the process of …………………… .
2. Cream is separated from milk by …………………… .
3. Iron particles are removed from metal scrap by ………………. .
4. Rice is separated from common salt by …………….. .
5. Pebbles are separated from grains by ………………. .
6. Filtration is used to separate ……………………. From a liquid.
7. After rains the environment becomes clear because the dust particles present in air settle down
due to ………….. by rain drops.
8. The substances containing only on type of constituent particles are called …………………. .
9. The components of a ………………….. retain their properties.
State true or false.
1. The process of winnowing is used to remove pebbles from grains.
2. Loading helps the clay particles in suspension to settle down.
3. Sugar is separated from sugar solution in water by decantation.
4. Sedimentation is a process of separating mud from muddy water.
5. Tea leaves from tea are separated by loading.
6. Sieving of sand at the construction site is not useful.
7. We can remove impurities from water by churning.
8. Quality of milk can be improved by sedimentation.
9. Water and cooking oil can be separated by loading.
MATCHING TYPE QUESTIONS ( MTQ)
Column I
Column II
i. Separating butter from curd
1. Sieving
ii. Separation of chaff from grains
2. Evaporation
iii. Separations of common salt from water
3. Magnet
solution
iv. Cleaning flour
4. Churning
v. Separation of iron particles
5. Winnowing
vi. Pure substances
6. Components or constituents
vii. Mixtures
7. Sieving
viii. Substances that make a mixture
8. Which contain only one component
ix. Removing dirt or stone from pulses
9. Winnowing
x. Removing common salt from pulses
10. Which contain more than one component
xi. Removing impurities from water
11. Sedimentation
xii. Removing oil mixed in water
12. Filtration
xiii. Removing dusk from wheat grain
13. Decantation
xiv
Removing sand from water
xv. Separating stones from sand
14. Loading
15. Hand picking
Very short answer questions.
1.
2.
3.
4.
5.
6.
7.
8.
9.
How can pieces of iron scrap be separated from garbage dumps?
What kind of mixtures can be separated by handpicking?
Define sedimentation.
What is a mixture?
What is a pure substance?
Why do we need to separate different substances present in a mixture?
Is it a good practice to sieve flour before consuming it?
Why air and soil are considered mixtures?
Why hand picking method is not used in godowns to remove dirt, stone or husk from the
grains of wheat and rice?
Short answer questions.
1. List three properties of pure substances.
2. Write three needs for separating the constituents of a mixture.
3. Write the methods you will use to separate a mixture of iron-filing, common salt and sand.
4. Identify the mixtures from the following: Pickle, Chutney, Jam, Sugar, Water, Common salt.
5. What is winnowing? Where is it used?
6. How will you separate husk of dirt particles from pulse before cooking?
7. You are given a mixture of sand and water. How will you separate it?
Long answer questions.
1. Define the following terms:
a. Filtration
b. Centrifugation
c. Winnowing
d. Sedimentation and decantation
2. Explain the method (technique ) that you would use to separate the following:
a. Cream
b. Chalk and water
c. Mud and water
d. Sawdust and water
3. Explain sieving. Is it good practice to sieve flour before consuming it? Why?
4. How will you separate husk of dirt particles from pulses before cooking?
5. Why is it necessary to remove undesirable components from a material?
6. How can you separate salt from a solution of salted water (brine)?
7. Is it possible to separate sugar from a solution of sugar in water? If yes, how will you do it?
8. What is the need for separation of substances?
9. Give the practical utility of centrifugation method.
10. How common salt is obtained from sea water?