Question $5$

The effective I $(I_{ef})$ value used for deflection calculations is:

$($a$)$ Less than $I_g$ because cracking increases the bending stiffness of the

beam.

$($b$)$ Less than $I_{cr}$ because cracking reduces the bending stiffness of the

beam.

$($c$)$ Greater than $I_g$ because the concrete in tension between the cracks adds

to the bending stiffness of the beam.

$($d$)$ Greater than $I_{cr}$ because the concrete in tension between the cracks

adds to the bending stiffness of the beam.

$($e$)$ None of the other answers is correct.