CHAPTER 3
Practice Set 1
Let’s Separate the Components
Grade 6 Science • Maharashtra State Board • 30 Marks
Q.1 (A) Choose the correct option.
4 Marks
(1) The substances that are mixed together in a mixture are called its __________.
(2) Which method uses a strong flow of air to separate substances?
(3) Which laboratory material contains extremely microscopic pores?
(4) Which one of the following is a magnetic substance?
Q.1 (B) Fill in the blanks.
4 Marks
(1) Two or more substances mixed together form a .
(2) The settling of heavy, insoluble solid particles at the bottom is called .
(3) The process in which a liquid changes into a gaseous state due to heat is called .
(4) A hand-operated instrument used for churning curd is called a .
Q.2 (A) State whether the following statements are true or false. Correct the false statement.
3 Marks
(1) Sieving separates solid substances whose particles differ in size.
(2) Butter is heavy and therefore settles at the bottom of buttermilk.
(3) Handpicking is convenient when the unwanted components are few in number.
Q.2 (B) Match the pairs.
4 Marks
| Group A | Group B |
|---|---|
| (1) Separating bran from flour | (a) Churning |
| (2) Separating butter from curd | (b) Magnetic separation |
| (3) Settling soil from muddy water | (c) Sieving |
| (4) Removing iron from city waste | (d) Sedimentation |
Q.3 Define the following terms.
2 Marks
(1) Mixture
(2) Components of a mixture
Q.4 Answer briefly.
6 Marks
(1) Why is chaff carried away while grains fall straight down during winnowing?
(2) How does filter paper separate muddy water?
(3) How is butter separated from buttermilk by churning?
Q.5 Give scientific reasons.
3 Marks
(1) A finer sieve is used to separate bran from flour.
(2) Alum helps soil particles in muddy water settle more quickly.
(3) Salt can be obtained from seawater without burning extra fuel.
Q.6 Apply your knowledge.
4 Marks
(1) A waste collector wants to separate pieces of iron from a heap of non-magnetic waste. Which method should be used? State the property used in this method.
(2) A student keeps a saucer containing salt solution in sunlight. What changes will be observed after one or two days? Name the process responsible for these changes.
CHAPTER 3
Practice Set 1 – Solutions
Let’s Separate the Components
Q.1 (A) Choose the correct option.
(1) Substances mixed together
Answer: (b) Components
(2) Method using a strong flow of air
Answer: (c) Winnowing
(3) Material with microscopic pores
Answer: (b) Filter paper
(4) Magnetic substance
Answer: (c) Iron
Q.1 (B) Fill in the blanks.
(1) Two or more substances mixed together form a ______.
Answer: Mixture
(2) Settling of heavy, insoluble particles is called ______.
Answer: Sedimentation
(3) A liquid changing into a gaseous state due to heat is called ______.
Answer: Evaporation
(4) A hand-operated instrument used for churning curd is called a ______.
Answer: Churner (ravi)
Q.2 (A) True or false. Correct the false statement.
(1) Sieving separates solid substances whose particles differ in size.
Answer: True.
(2) Butter is heavy and therefore settles at the bottom of buttermilk.
Answer: False.
Butter is fatty and light. Therefore, it floats on the buttermilk.
(3) Handpicking is convenient when unwanted components are few in number.
Answer: True.
Q.2 (B) Match the pairs.
(1) – (c)
Separating bran from flour — Sieving
Separating bran from flour — Sieving
(2) – (a)
Separating butter from curd — Churning
Separating butter from curd — Churning
(3) – (d)
Settling soil from muddy water — Sedimentation
Settling soil from muddy water — Sedimentation
(4) – (b)
Removing iron from city waste — Magnetic separation
Removing iron from city waste — Magnetic separation
Q.3 Define the following terms.
(1) Mixture
Answer: When two or more substances are mixed together, the resulting material is called a mixture.
(2) Components of a mixture
Answer: The substances that are mixed together to form a mixture are called the components of that mixture.
Q.4 Answer briefly.
(1) Why is chaff carried away while grains fall straight down during winnowing?
Answer: Grains are heavy, so they fall straight down. Chaff and other debris are lighter, so the wind carries them away.
(2) How does filter paper separate muddy water?
Answer: Filter paper has extremely microscopic pores. Water passes through these pores, while the insoluble soil particles remain on the filter paper.
(3) How is butter separated from buttermilk by churning?
Answer: Churning pushes the butter particles towards the edges of the vessel. The particles stick together and form a large lump. Since butter is fatty and light, it floats on the buttermilk and can be separated.
Q.5 Give scientific reasons.
(1) A finer sieve is used to separate bran from flour.
Answer: Flour particles are smaller than bran particles. The small flour particles pass through the fine holes, while the larger bran particles remain on the sieve.
(2) Alum helps soil particles in muddy water settle more quickly.
Answer: Dissolved alum particles stick to the soil particles. The combined particles become heavier and settle at the bottom more quickly.
(3) Salt can be obtained from seawater without burning extra fuel.
Answer: Seawater is kept in salt pans under sunlight. Solar heat evaporates the water and leaves the salt behind. Therefore, no extra fuel needs to be burnt.
Q.6 Apply your knowledge.
(1) Separating pieces of iron from non-magnetic waste
Answer: Magnetic separation should be used. This method uses the magnetic property of iron. A magnet attracts the iron pieces but does not attract the non-magnetic waste.
(2) Salt solution kept in sunlight
Answer: The quantity of water will gradually decrease because it changes into vapour. Finally, solid salt will remain in the saucer. This process is called evaporation.
Salt solution + Sunlight → Water vapour + Solid salt