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Your Progress - Chapter 30% complete
1I. Choose the correct answer:7 questions
Q.1………. is not made of matterv
- A. Gold ring
- B. iron nail
- C. light ray
- D. oil drop
Q.2200 ml of water is poured into a bowl of 400ml capacity. The volume of water now will be _____v
- A. 400 ml
- B. 600 ml
- C. 200 ml
- D. 800 ml
Q.3Seeds from water-melon can be removed by method.v
- A. Hand-picking
- B. filtration
- C. magnetic separation
- D. decantation
Q.4Lighter impurities like dust, when mixed with rice or pulses, can be removed by _____v
- A. filtration
- B. sedimentation
- C. decantation
- D. winnowing
Q.5………… of is essential to perform winnowing activityv
- A. Rain
- B. Soil
- C. Water
- D. Air
Q.6Filtration method is effective in separating _____ mixture.v
- A. solid – solid
- B. solid – liquid
- C. liquid – liquid
- D. liquid – gas
Answer:(b) solid – liquid
Q.7From the following ………. is not a mixturev
- A. Coffee with milk
- B. lemon juice
- C. Water
- D. ice cream embedded with nuts.
2II. State whether the following statements are True or False. If false give the correct statement1 questions
Q.G1Air is not compressible. Liquids have no fixed volume but have fixed shape. Particles in solids are free to move. Then pulses are washed with water before cooking, the water is separated from them by the process of filtration. Strainer is a kind of sieve which is used to separate a liquid from solid Grain and husk can be separated by winnowing Air is a pure substance Butter from curds is separated by sedimentation.v
Answer:False. Air is Compressible.
False. Liquids have no fixed shape but have fixed volume.
False Particles in solids are not free to move.
False. When pulses are washed with water before cooking, the water is separated from them by the process of Decantation.
False. Strainer is a kind of sieve which is used to separate a solid from liquid.
True.
False. Air is a mixture. (Or) Air is not a pure substance.
False. Butter from curds is separated by churning.
3IV. Fill in the blanks1 questions
Q.G2Matter is made up of ……… In solids, the space between the particles is less than in ………. Grains can be separated from their stalks by ………. Chillies are removed from ‘upma’ by ……… method. The method employed to separate clay particles from water is ………. Among the following items: Safety pins, pencil and rubber band, ………. will get attracted to a magnet. Water obtained from tube wells is usually ………. waterv
Answer:Atoms
An Liquids
Threshlng
Hand picking
Filtration
Safety pins
Impure
4V. Complete the given analogy1 questions
Q.G3Solid: rigidity :: gas: ………… Large Inter-particle space: gas:: ………. : solid Solid : definite shape :: ……… : shape of the vessel. Husk-grains: winnowing:: Sawdust-chalk piece: ……….. Murukku from hot oil: ………. :: coffee powder residue from decoction Iron-sulphur mixture: ……….. :: Mustard seeds from Urad-dhal: Rollingv
Answer:Compressibility
Little inter-particle space
Liquids
Sedimentation and Decantaium
Hand picking; Filtralion.
Magnetic Separation.
5VI. Very short answer6 questions
Q.8Define the term matter.v
Answer:The matter is defined as anything that has mass and takes up space. The matter is found in solid, liquid, and gas.
Q.9How can husk or fine dust particles be separated from rice before cooking?v
Answer:Before cooking, the husk or fine dust particles in rice are being separated by ‘Sedimentation’. The lighter impurities float while heavier rice grains sink to the bottom.
Q.10Why do we separate mixtures?v
Answer:A mixture is an impure substance and contains more than one kind of particles. So, we have to separate mixtures.
Q.11Give an example for mixture and justify your answer with reason.v
Answer:An example of a mixture is 22 Carat Gold. This is composed of Gold and Copper (or) Gold and Cadmium.
Q.12Define Sedimentation.v
Answer:Sedimentation is the deposition process of setting down of heavy solids in a mixture of liquid and an insoluble solid.
Q.13Give the main difference between a pure substance and an impure substance.v
Answer:Pure Substance :
Made up of only one kind of particles.
Cannot be separated by physical means.
Impure Substance :
Has particles of other Substance mixed in it.
Can be separated by physical means.
6VII. Short Answer.7 questions
Q.14A rubber ball changes its shape on pressing. Can it be called a solid?v
Answer:Yes. A solid has a certain shape and size. The shape of a rubber ball changes only if we squeeze it.
Q.15Why do gases not have fixed shape?v
Answer:Gases do not have a fixed shape due to the weak forces of attraction between the gaseous particles. Hence, they can flow and take shape of the container.
Q.16What method will you employ to separate cheese (paneer) from milk? Explain.v
Answer:“Churning followed by Coagulation” is employed to separate cheese (Paneer) from milk. There are six important steps in making cheese (Paneer) from milk:
Acidification
coagulation
separating curds and whey
Salting
shaping
ripening
Q.17Look at the picture given below and explain the method of separation illustrated. v
Answer:The given picture shows the ‘Sieving’ method of separation. It is used to separate the solid particles of different sizes. Example: Bran from flour; Sand from gravel.
Q.18How can you separate a mixture of a large number of tiny bits of paper mixed with pulses/dal?v
Answer:We can separate the mixture of a large number of tiny bits of paper and pulses/dal by “Winnowing”. The lighter papers will be carried by wind and heavier pulses/dais will fall closer and form a separate heap.
Q.19What is meant by food adulteration?v
Answer:The process of mixing harmful and unwanted substances with the foodstuffs that we buy in the market is called food adulteration
Q.20Mr. Raghu returns home on a hot summer day and wants to have buttermilk. Mrs. Raghu has only curds. What can she do to get buttermilk? Explain.v
Answer:Mrs. Raghu has to take half a cup of curd, add half a cup of water to it, and mix well. Now, she can serve buttermilk.
7VIII. Answer In Detail.5 questions
Q.21Distinguish between properties of solid, liquid, gas. Draw a suitable diagram.v
Q.22Using a suitable apparatus from your laboratory, separate the mixture of chalk powder, mustard oil, water, and coins. Draw a flow chart to show the separation process.v
Q.23Malar’s mother was preparing to cook dinner. She accidentally mixed ground nuts with urad-dhal. Suggest a suitable method to separate the two substances so that Malar can have ground nuts to eat.v
Answer:The groundnuts shall be separated by hand-picking method because they are in a different size When compared with urad-dhal.
Q.24In a glass containing some water, tamarind juice and sugar is added and stirred well. Is this a mixture-can you tell why? Will this solution be sweet? Or sour? Or both sweet and sour?v
Answer:A glass containing some water, Tamarind juice, and sugar is a mixture.
Because it is made up of two or more ingredients that are physically separable.
This mixture is both sweet and sour.
8I. Choose The Correct Answer1 questions
Q.25A standard sheet of paper is about atoms thick.v
- A. Thousands
- B. Crores
- C. Lakhs
- D. Million
9III. Fill in the blanks1 questions
Q.G4……… particles are tightly packed into a definite shape. The tendency of particles to spread out in order to occupy the available space is ……….. The purest form of gold is denoted by ……….. Milk is a ……….. The principle of ………. is used in washing machines.v
Answer:Solid
diffusion
24 carat
mixture
centrifugation
10IV. Very short answer.1 questions
Q.26Mention the method of separation of Bran from flour. Explain.v
Answer:Bran from flour is separated by ‘sieving’.
Solid particles of different sizes can be separated by sieving.