Answer the following questions in brief.
(a) How did man use the percussion technique?
(a) Man used the process of percussion (striking one large pebble against another) in the Old Stone Age. This technique was used to shape stone tools, and the resulting flakes were used to extract meat from hides, chop food, and sharpen sticks.
(b) What revolution was brought about by Homo sapiens in the tool-making technique?
(b) Homo sapiens revolutionized tool making technology when they discovered a way to obtain long and narrow blades of stone. With these long blades they made knives, scrapers, borers, chisels and more. He also began to use ivory and rare stones, such as quartz, to make tools and other materials.
Which of the following modern machines has stone grinders?
(a) Mixer
(b) Flour mill
(c) Juicer
Ans – (b) Flour mill
