1. Contraction of ventricles is known as diastole.   True   False   2. Sphygmomanometer is an instrument used to record   Blood pressure   Electrical activity of heart   Respiratory rate   Heart rate   Hint Half-n-half Clue   3. Bleeding time is prolonged in hemophilia.   True   False   4. This statement is true regarding platelets :   Platelets do not contain nucleus.   Platelets contain many nuclei.   Platelets contain an ill-defined nucleus.   Platelets contain single nucleus.   Hint       5. Identify the blood vessel 'D' in this diagram.   Superior vena cava   Pulmonary Trunk   Inferior vena cava   Aorta   Half-n-half Clue   6. This statement is not true :   Veins return blood from the various parts of the body to the heart.   Veins are thin-walled.   Veins contain valves.   All veins carry deoxygenated blood.   Hint       7. Which of these does not cause an increase in pulse rate?   Exercise   Anxiety   Sleep   Fever   Hint