NCERT Class VI Science Solutions: Chapter 5 – Separation of Substances Part 2

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Question 7:

You might have observed the preparation of ghee from butter and cream at home. Which method(s) can be used to separate ghee from the residue?

  1. Evaporation

  2. Decantation

  3. Filtration

  4. Churning

Which of the following combination is the correct answer?

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (ii) and (iv)

  4. (iv) only

Answer: B

Question 8:

In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half filled with water. Which method would you use to get back solid copper sulphate from the solution?

  1. Decantation

  2. Evaporation

  3. Sedimentation

  4. Condensation

Answer: B

Image of Evaporation

Image of Evaporation

Image of Evaporation

Question 9:

During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle shift had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

  1. Boiling and condensation.

  2. Evaporation and saturation.

  3. Evaporation and condensation.

  4. Condensation and saturation.

Answer: C

Question 10:

Paheli asked for a glass of water from Boojho. He gave her a glass of ice cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed? Which of the following should be Boojho’s answer?

  1. Evaporation of water from the glass.

  2. Water that seeped out from the glass.

  3. Evaporation of atmospheric water vapour.

  4. Condensation of atmospheric water vapour.

Answer: D

VERY SHORT ANSWER QUESTIONS

Question 11:

Sheela, Samia and Ravi have to dissolve maximum amount of sugar in the same amount of milk so as to win in a game. Ravi took hot boiling milk while Samia took ice cold milk. Sheela managed to get milk at room temperature. Whom do you think would win the game and why?

Answer:

Hint: Milk at higher temperature would dissolve more sugar so Ravi would win the game.