Science Quiz

The process of settling down of particles of a solid in a liquid is

• Sublimation

• Sedimentation

• Filtration

• Decantation

While preparing chapatis, Priti found that the flour to be used was mixed with wheat grains. Which out of the following is the most suitable method to separate the grains from the flour?

• Threshing

• Sieving

• Winnowing

• Filtration

What is the process that is used to separate grains from stalks called?

• winnowing

• handpicking

• threshing

• sieving

The drops of water that appear on the outside of a glass of cold water on a warm day are an example of?

• sublimation

• condensation

• evaporation

Iron and copper screws could be separated using a magnet because

• iron is magnetic, copper is not

• copper is magnetic, iron is not

• neither metal is magnetic

• copper screws are heavier than iron and fall off the magnet

What is the purpose of Filtration?

• Separates heavier substances from a suspension

• Separation of a mixture of 2 solids

• Separating and insoluble solid from a liquid

Which of the following is essential to perform winnowing activity?

• Wind

• Water

• Magnet

• Filter paper

The process of changing solid to gas directly is ______

• Evaporation

• Condensation

• Melting

• Sublimation

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

• evaporation

• centrifugation

• filtration

• sedimentation and decantation

Sawdust is not soluble in water. If, accidentally some particles of sawdust drop into a glass of water. How would you separate them from water?

• Decanting

• Filtering

• Distillation

• Sieving