Gr 4C Science Quiz: Sedimentation, Decantation, and Filtration

Question 1: What is sedimentation?

• Particles floating on the surface of a liquid

• The process of boiling a liquid to remove impurities

• The separation of a liquid from a solid by passing it through a filter paper

• Particles settling down at the bottom of a liquid

Answer explanation

Sedimentation is the process of particles settling down at the bottom of a liquid.

Which of the following mixtures can be separated using sedimentation?

• A mixture of sand and water

• A mixture of sugar and water

• A mixture of oil and water

• A mixture of salt and water

Answer explanation

A mixture of sand and water can be separated using sedimentation.

Question 3: How does sedimentation help in separating mixtures?

• The particles dissolve in the liquid, making it easier to separate

• Sedimentation has no effect on separating mixtures

• The particles become lighter and rise to the top, separating from the heavier particles

• Heavier particles settle at the bottom, separating from the lighter particles.

Answer explanation

Sedimentation helps in separating mixtures by allowing heavier particles to settle at the bottom, separating from the lighter particles.

What is the process of decantation?

• Carefully pouring off the liquid without disturbing the solid particles

• Shaking the mixture vigorously to separate the solid and liquid

• Stirring the mixture to combine the solid and liquid particles

• Heating the mixture to evaporate the liquid and leave behind the solid particles

Answer explanation

Decantation is the process of carefully pouring off the liquid without disturbing the solid particles.

Question 5: When is decantation used to separate mixtures?

• When both components are in gaseous form and can be easily separated

• When the components are of the same density and cannot be separated

• When one component is in liquid form and settles at the bottom of the container.

• When the mixture contains only solid components and no liquid

Answer explanation

Decantation is used when one component is in liquid form and settles at the bottom of the container.

Question 6: Tara, Rohan, and Arnav are planning to perform an experiment. Can you explain the steps involved in the process of decantation?

• Stirring the mixture to mix the solid and liquid together

• Heating the mixture to evaporate the liquid and leave the solid behind

• Shaking the mixture vigorously to separate the solid and liquid

• Carefully pouring off the liquid without disturbing the solid at the bottom

Answer explanation

Decantation involves carefully pouring off the liquid without disturbing the solid at the bottom. This separates the two substances.

Question 7: Which two materials are essential for filtration?

• Glass, rubber bands

• Aluminum foil, wood chips

• Filter paper, sand

• Cotton balls, plastic

Question 8: How does filtration help in separating mixtures?

• By shaking the mixture vigorously to separate the particles

• By heating the mixture to separate the components

• By using a magnet to attract the particles

• By using a barrier to separate solid particles from a liquid or gas.

Which example best illustrates sedimentation in daily life?

• When a cake is baked in the oven

• When water is left undisturbed, the sand and dirt settle to the bottom of the container.

• When water is boiled to make tea

• When oil and vinegar are mixed together

Answer explanation

Sedimentation occurs when sand and dirt settle at the bottom of a container when water is left undisturbed.

What is the definition of solute according to Siya, Naira, and Alisha?

• The substance that dissolves in a solvent to form a solution

• The substance in which the solute is dissolved

• The process of separating a solute from a solvent

• The substance that prevents the solute from dissolving in the solvent

Answer explanation

According to Siya, Naira, and Alisha, solute is the substance that dissolves in a solvent to form a solution.