Question

Which of the following statements is incorrect?​
i) Both liquids and gases exert pressure.​
ii) Friction is only an evil. ​
iii) fluid friction is least for streamlined objects.​

• A. Only (I) and (ii)​
• B. Only (ii) and (iii)​
• C. Only (iii)​
• D. Only (ii)​

Answer 1

The correct option is D Only (ii)​

Let’s see all the statements one by one:
All the fluids exert pressure. Hence statement (i) is correct
Though friction is evil as it damages various substances but it is also necessary for us. We cannot move without friction, we cannot grip anything without friction, and many more things which are not possible without it.
So friction is not only evil. Hence statement (ii) is correct.
Fluid friction varies with the shape of the object. For the objects with streamlined shapes, it is the least. Hence, statement (iii) is also true.
So, only (ii) is incorrect.