# Step-by-Step Solution Let's analyze each option related to GD&T (Geometric Dimensioning and Tolerancing) to find out which statement is **false**. --- ## Option Analysis ### 1. **Every size dimension must be either controlled by a ± tolerance or a geometric tolerance.** - **Explanation:** This is true. In GD&T, size dimensions should always be specified either with traditional ± tolerances or via geometric tolerancing to ensure clear manufacturing requirements. --- ### 2. **A fully defined drawing will have Size, Location, Orientation and Form controlled for all features.** - **Explanation:** This is true. For a drawing to be fully defined in GD&T, all four aspects (Size, Location, Orientation, and Form) should be controlled wherever necessary. --- ### 3. **Every geometric control must have the part restrained in all 6 degrees of freedom.** - **Explanation:** This is **false**. Not all geometric controls require full restraint in all 6 degrees of freedom (three translations and three rotations). For example, a flatness control does not reference a datum and does not restrain all degrees of freedom. Only **certain constraints like datums** or **position with three datums** can restrain all 6 degrees of freedom. --- ### 4. **Geometric tolerances for form must be less than the size tolerance to avoid being redundant.** - **Explanation:** This is **true**. According to GD&T principles (specifically the "Envelope Principle" or "Perfect Form at MMC"), form tolerance should be less than the size tolerance. If not, the form control becomes redundant. --- ## **Final Answer** ### The statement that is **false** about GD&T is: > **Every geometric control must have the part restrained in all 6 degrees of freedom.** --- ## **Incorrect Options Explained** - **Option 1 (True):** Every size must be properly controlled. - **Option 2 (True):** Size, Location, Orientation, and Form must be controlled in a fully defined drawing. - **Option 4 (True):** Form tolerances must be tighter than size tolerance to have an effect. --- ### **Correct Answer:** **Every geometric control must have the part restrained in all 6 degrees of freedom.** (This is FALSE.)