Which is a contraceptive method with no side effects?

How do diaphragms,cervical caps,and vaults function as contraceptives?

Choose the correct option for non-medicated $IUDS$.

$IUDs$ within .......... of coitus have been found to be very effective as emergency contraceptives as they could be used to avoid possible pregnancy due to rape or casual unprotected intercourse. (in $hours$)

Match the columns:

Column $I$	Column $II$
$(a)$ Physical method	$(p)$ Synthesized rubber or plastic cap
$(b)$ Diaphragms	$(q)$ Spermicidal substance
$(c)$ Chemical method	$(r)$ Condoms

Which of the following functions are true for copper ions released by copper-releasing $IUDs$?
$I -$ Suppress sperm motility
$II -$ Inhibit the fertilizing capacity of sperms
$III -$ Make the uterus unsuitable for implantation
$IV -$ Make the cervix hostile to sperms