Question $4$:$-$

Fire point is the temperature at which the binder

For the penetration test the needle is left for $q,$ minutes

The bath temperature for softening point test should be around $q,C$ before starting heating

Softening point is the temperature at which the binder $q,$

The temperature for the ductility test is

$\text{'}$C

The apparatus used to conduct the softening point test $q,$