CBSE Class 6 Science Methods of Separation in Everyday Life (Class 6 NCERT New) Quiz 6

1. Which method of separation uses heat to convert a liquid into vapour, leaving behind the dissolved solid?

A Decantation B Magnetic separation C Filtration D Evaporation

2. Which of the following materials can be separated using a magnet?

A Sand and salt B Iron filings and sand C Oil and water D Sugar and water

3. A student has a mixture of chalk powder and water. Which method would be most appropriate to separate the chalk powder from the water?

A Evaporation B Magnetic separation C Filtration D Decantation alone

4. In the decantation method, why is the liquid poured slowly and carefully from one container to another?

A To heat the liquid faster B To avoid disturbing the settled solid at the bottom C To mix the solid and liquid together D To increase the speed of evaporation

5. A farmer wants to separate iron nails accidentally mixed with wheat grains. Which method should the farmer use and why?

A Filtration, because iron nails dissolve in water B Evaporation, because iron nails evaporate easily C Magnetic separation, because iron is attracted to magnets while wheat is not D Decantation, because iron nails float on water

6. Which of the following correctly describes a heterogeneous mixture?

A A mixture that has a uniform composition throughout B A mixture where the components are evenly distributed C A mixture where the components are not uniformly distributed and can be seen separately D A mixture that cannot be separated by any physical method

7. During evaporation, salt water is heated in an evaporating dish. What happens to the water and the salt respectively?

A Water remains; salt evaporates B Both water and salt evaporate together C Water evaporates; salt remains in the dish D Salt dissolves further and both remain in the dish

8. A student has a mixture of sand, iron filings, and salt dissolved in water. They want to separate all three components. Which sequence of methods would be most logical?

A Filtration → Magnetic separation → Evaporation B Magnetic separation → Filtration → Evaporation C Evaporation → Decantation → Magnetic separation D Decantation → Evaporation → Filtration

9. Two students are given a mixture of oil and water. Student A uses decantation, and Student B uses filtration. Which student chose the correct method, and why is the other method unsuitable?

A Student B is correct; decantation does not work because oil and water have the same density B Student A is correct; filtration is unsuitable because oil forms a liquid layer and does not get trapped by filter paper C Both methods work equally well for separating oil and water D Student B is correct; filter paper absorbs oil and separates it from water

10. A scientist needs to obtain pure salt from a mixture of salt water and mud. She first filters the mixture and then evaporates the filtrate. Explain what the filtrate contains and why evaporation is used as the second step.

A The filtrate contains mud; evaporation is used to dry the mud B The filtrate contains salt water; evaporation is used to remove the water and collect the salt C The filtrate contains only water; evaporation is used to collect the water vapour D The filtrate contains mud and salt; evaporation separates them further