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MCQ Questions: Separation of Substances - Grade 8 MCQ


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10 Questions MCQ Test Science for Grade 8 - MCQ Questions: Separation of Substances

MCQ Questions: Separation of Substances for Grade 8 2024 is part of Science for Grade 8 preparation. The MCQ Questions: Separation of Substances questions and answers have been prepared according to the Grade 8 exam syllabus.The MCQ Questions: Separation of Substances MCQs are made for Grade 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ Questions: Separation of Substances below.
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MCQ Questions: Separation of Substances - Question 1

Which method is used to separate pebbles and stones from sand?

Detailed Solution for MCQ Questions: Separation of Substances - Question 1

Pebbles and stones are removed from sand by sieving. Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain on the sieve

MCQ Questions: Separation of Substances - Question 2

Which method is used to separate butter from milk or curd?

Detailed Solution for MCQ Questions: Separation of Substances - Question 2

Churning is the process used to separate butter from milk or curd. This involves rapidly stirring the milk or curd to separate the butterfat from the liquid.

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MCQ Questions: Separation of Substances - Question 3

What happens during the sedimentation process?

Detailed Solution for MCQ Questions: Separation of Substances - Question 3
Sedimentation involves the heavier component of a mixture settling at the bottom when the mixture is left undisturbed. This is often followed by decantation to remove the liquid component.
MCQ Questions: Separation of Substances - Question 4
What is the main method used to separate grain seeds from stalks?
Detailed Solution for MCQ Questions: Separation of Substances - Question 4
Threshing is the process of separating grain seeds from stalks by beating the stalks to free the seeds. It is an essential step in grain processing.
MCQ Questions: Separation of Substances - Question 5
Which separation technique is used to obtain salt from seawater?
Detailed Solution for MCQ Questions: Separation of Substances - Question 5
Evaporation is used to obtain salt from seawater by allowing the water to evaporate, leaving the salt behind. This method is commonly used in salt pans.
MCQ Questions: Separation of Substances - Question 6
How can a mixture of sand and salt be separated effectively?
Detailed Solution for MCQ Questions: Separation of Substances - Question 6
The mixture can be separated by adding water to dissolve the salt, filtering out the sand, and then evaporating the water to obtain the salt.
MCQ Questions: Separation of Substances - Question 7

Which method is best for separating a mixture of sugar and water?

Detailed Solution for MCQ Questions: Separation of Substances - Question 7

The best method for separating a mixture of sugar and water is evaporation.

Here's why:

  • Decantation: This method is used to separate a liquid from a solid that has settled at the bottom. It is not suitable for separating sugar from water.
  • Filtration: This method separates solids from liquids or gases. Since sugar dissolves in water, it cannot be filtered out.
  • Evaporation: This method involves heating the solution to evaporate the water, leaving behind the sugar. It is effective for separating a dissolved solid from a liquid.
  • Sedimentation: This method is used to separate solid particles that settle at the bottom of a liquid. Since sugar is dissolved in water, it does not settle out.
MCQ Questions: Separation of Substances - Question 8
What is the purpose of filtration in separation processes?
Detailed Solution for MCQ Questions: Separation of Substances - Question 8
Filtration is used to separate an insoluble solid from a liquid, such as separating tea leaves from tea.
MCQ Questions: Separation of Substances - Question 9
Why is handpicking a convenient method for separating certain mixtures?
Detailed Solution for MCQ Questions: Separation of Substances - Question 9
Handpicking is convenient for separating large-sized impurities, like stones and husks, from grains because it does not require any special equipment.
MCQ Questions: Separation of Substances - Question 10
How is filtration used in the preparation of paneer?
Detailed Solution for MCQ Questions: Separation of Substances - Question 10
Filtration in paneer preparation involves separating the solid paneer from the liquid whey by using a fine cloth or strainer after adding a coagulant like lemon juice to the milk.
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