What does axis deviation mean on ECG?

Match List I with List II.

Choose the correct answer from the options given below:

Recognize the figure and find out the correct matching?

In the electrocardiogram, QRS complex stands for:

The diagram below shows a typical $\mathrm{ECG}$.

If the $\mathrm{AV}$ node is not functional, which of the following options correctly represents the changes seen in the $\mathrm{ECG}$?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

In an ECG, the depolarization of atria is indicated by

Write the differences between:

(d) P-wave and T-wave