Need for Separation

Q. _____ method is used to separate scrap-iron from other wastes in the scrap yard.

1. Sublimation
2. Magnetic separation
3. Hand picking
4. Winnowing

Q.

Which separation technique is used to separate iron powder from a mixture of iron and aluminium powder?

1. Distillation

2. Magnetic separation

3. Fractional distillation

4. Filtration

Q. Using winnowing, we can separate the grain from the .

1. stalk
2. husk
3. stones

Q. Separation is only done to filter out unwanted substances.

1. True
2. False

Q.

____________ is a process that separates a pure solid in the form of its crystals from a solution.

1. Filtering

2. Condensation

3. Crystallisation

4. Solidification

Q. Which of the following statements are true for crystallisation?

1. It involves formation of new substances.
2. It is used to separate solutes soluble in a solvent.
3. It is used to obtain large crystals of solute.
4. It is an example of a physical change.

Q. Stones found among grains are separated by handpicking.

1. True
2. False

Q. Heterogeneous mixtures can be separated by handpicking, filtration and sieving.

1. True
2. False

Q.

Churning out butter from milk is a technique of ___________.

1. Distillation

2. Filtering

3. Separation

4. Mixing

Q. The process of removing tea leaves from tea using a strainer is known as __________.

1. evaporation
2. filtration
3. sedimentation
4. decantation