A food sample is rubbed on a piece of paper and the paper becomes translucent. This indicates the presence of .
You observe some oily patches on a piece of paper in which your food is wrapped as shown in the figure, this shows the presence of which component of food?
When a plastic scale rubbed on dry hair is kept close to small paper pieces, it attracts the paper pieces. When the rubbed portion of scale is touched with hand, the pen looses attractive nature. Give reason for this.