If diamond is called gold,gold is called silver,silver is called ruby and ruby is called emerald,which is the cheapest jewel?

In a certain code:
$(A)$ 'Kemp Lamp Terns' means 'Speak the truth'
$(B)$ 'Bis Tim Nak' means 'Always seek knowledge'
$(C)$ 'Tim Terns Sik' means 'Knowledge is truth'
$(D)$ 'Lik Bis Zap' means 'Never seek violence'
Which letter code stands for 'Always'?

In a certain language,the numbers are coded as follows:

$4$	$3$	$9$	$2$	$1$	$6$	$7$	$8$	$5$	$2$	$0$
$A$	$W$	$P$	$Q$	$R$	$B$	$E$	$S$	$G$	$J$	$M$

How is $720435$ coded in that code?

In a certain code,$EXPLAINING$ is written as $PXEALNIGNI$. How is $PRODUCED$ written in that code?

In a certain code,'$467$' means 'leaves are green','$485$' means 'green is good' and '$639$' means 'they are playing'. Which digit stands for 'leaves' in that code?

In a certain code,$4$ il be pee $9$ means 'roses are blue',$sik$ hee $9$ means 'red flowers' and $pee$ mit hee $9$ means 'flowers are vegetables'. How is 'red' written in that code?