A carpenter wants to separted iron nails from saw-dust. Which method of separation should he choose ?

To separate pebbles from sand, which method would be used :

For separating husk from wheat grains, which method is used ?

Which method is used to separate butter from milk?

Joseph wants to pick the iron nails kept on a table. Which of the following devices should Joseph use to pick the iron nails?

Which method of separation is used to separate durgs from blood ?

Boojho has three thermometers as shown in figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer (s) should he choose?

A small device pulls iron nails from a distance. Which type of force is involved in this process?