Which of the following statements is/are NOT correct ?

I. Force per unit volume is called pressure.

II. Liquids can exert pressure on walls of containers.

III. Force acting on an object can cause a change in it state of motion but not its shape.

Only I and III

The correct answer is option 4. Only I and III

I. Force per unit volume is called pressure.False. Pressure is defined as force per unit area, not volume.

II. Liquids can exert pressure on walls of containers. True. Liquids exert pressure in all directions, including on the walls of the container. 

III. Force acting on an object can cause a change in it state of motion but not its shape. False. Force can change both motion and shape (for example, stretching a rubber band).