Which wave is produced when the action potential is conducted from the $SA$ node to the $AV$ node?

Given below are two statements.
Statement $I$ - Graphical recording of electrical variations detected at the surface of body during their propagation through the wall of heart is electrocardiograph.
Statement $II$ - The instrument used for the graphical recording of electrical variations detected at the surface of body during their propagation through wall of heart is electrocardiogram.
In the light of above statements,select the correct option given below:

Blood pressure is directly proportional to the following $EXCEPT$ . . . . . . .

Match the Column $-I$ with Column $-II$.

Column $-I$	Column $-II$
$(a) \; P-$wave	$(i) \; \text{Depolarisation of ventricles}$
$(b) \; QRS$ complex	$(ii) \; \text{Repolarisation of ventricles}$
$(c) \; T-$wave	$(iii) \; \text{Coronary ischemia}$
$(d) \; \text{Reduction in the size of } T-$wave	$(iv) \; \text{Depolarisation of atria}$
	$(v) \; \text{Repolarisation of atria}$

Select the correct option:
$(a) \quad (b) \quad (c) \quad (d)$

Match List $I$ with List $II$.

List $I$	List $II$
$A$. $P$-wave	$I$. Beginning of systole
$B$. $Q$-wave	$II$. Repolarisation of ventricles
$C$. $QRS$ complex	$III$. Depolarisation of atria
$D$. $T$-wave	$IV$. Depolarisation of ventricles

Choose the correct answer from the options given below:

In a standard $ECG$,one of the following functions of its components is not correctly interpreted.