State whether the following statement TRUE or FALSE.

The best-fit techniques for memory allocation ensures the memory will never be fragmented.

State whether the following statement TRUE or FALSE.

The use of monitors ensures that no dead -locks will be caused.

State whether the following statements are TRUE or FALSE with reason.
The Link-load -and-go loading scheme required less storange space than the Link-and-go loading scheme.

In a two -level virtual memory, the memory access time for main memory, $${t_M} = {10^{ - 8}}\sec $$ and the memory access time for the secondary memory, tag $$ = {10^{ - 3}}.$$ What must be the hit ratio, $$H$$ such that the access efficiency is within $$80$$ percent of its maximum value?