ECG Curve

Q. At which point of ECG, the initiation of ventricular contraction is marked by

1. P
2. Q
3. T
4. S

Q. Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

1. Peak T - Initiation of total cardiac contraction
2. Peak P - Initiation of atrial contraction
3. Complex QRS - One complete pulse
4. All the above

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

	Column I		Column II
A	P-wave	1	Depolarisation of ventricles
B	QRS complex	2	Repolarisation of ventricles
C	T-wave	3	Coronary ischemia
D	Inversion of T-wave	4	Depolarisation of atria
		5	Repolarisation of atria

1. A-2, B-3, C-5, D-4
2. A-4, B-1, C-2, D-3
3. A-4, B-1, C-2, D-5
4. A-2, B-1, C-5, D-3

Q. Which of the following correcty explains a phase/event in cardiac cycle in a standard electrocardiograph?

1. QRS complex indicates atrial contraction
2. QRS complex indicates ventricular contraction
3. T-wave represents the return of the atria
4. P-wave indicates beginning of ventricular contraction

Q.

Which of the following is false about ECG?

1. P wave $\to$ artial depolarisation

2. QRS complex $\to$ ventricular depolarisation

3. T wave $\to$ ventricular repolarisation

4. ST depression indicates infarction

Q. During QRS wave

1. signals of contraction spread throughout atria
2. signals of contraction spread throughout ventricles
3. ventricles return from excited state to normal state
4. none of these