Ans: (a)
292. A popping sound is heard in the ear when yawning or swallowing. This is caused by:
     (a) air in the cochlea
     (b) the opening of the Eustachian tubes
     (c) air entering the perilymph
     (d) the moving of the jaws
Ans: (b)
293. The hormone responsible for the secretion of milk in mothers is :
     (a) adrenalin
     (b) lactogenic hormone
     (c) ACTH
     (d) lentinzing hormone
Ans: (b)
294. Which of the following are true about amniocentesis?
     1) It involves taking a sample of the blood of the growing baby inside the womb.
     2) It is usually conducted around the 16th week of pregnancy.
     3) It is used to terminate pregnancy.
     4) Chemical examination of the fluid withdrawn reveals the presence or absence of genetic disorder in the baby.
     (a) 1, 2 and 3
     (b) 1, 3 and 4
     (c) 1, 2 and 4
     (d) 1, 2, 3 and 4
Ans: (c)
295. A vein is a vessel that carries blood:
     (a) with high concentration of oxygen
     (b) with high concentration of carbon dioxide
     (c) towards the heart
     (d) away from the heart
Ans: (c)
296. The study of the interaction of antigens and antibodies is called:
     (a) argiology
     (b) haematology
     (c) serology
     (d) cryobiology
Ans: (c)
297. Which one of the following organisms is required for the preparation of alcohol?
     (a) Protozoa
     (b) Fungi
     (c) Bacteria
     (d) Viruses
Ans: (b)
298. Pace-maker is also known as :
     (a) A.V. Node
     (b) Bundle of His
     (c) SA Node