Question

Mobility of a statically indeterminate structure is

• A. $\le -1$
• B. 0
• C. 1
• D. $\ge -2$

Answer 1

The correct option is A $\le -1$

Mobility or degree of freedom for a statically indeterminate structure is always less than zero.
i.e., F < 0
$\therefore$ only option (a) is negative value
$\therefore$ $F\le -1$