Read and study the given actions carefully and answer correctly to “Where the friction is useful”…………… I) Striking a match stickII) Writing with a pencil III) Pushing a cupboard from one room to another. IV) Sharpening a knife. A) I and II only B) I and III only C) I, II and IV only D) All of the above

Read and study the given actions carefully and answer correctly to “

1.	Read and study the given actions carefully and answer correctly to “Where the friction is useful”…………… I) Striking a match stickII) Writing with a pencil III) Pushing a cupboard from one room to another. IV) Sharpening a knife. A) I and II only B) I and III only C) I, II and IV only D) All of the above
Answer» C) I, II and IV only