2616: Where does exchange of gases (O2 and CO2) take place in our lungs ?
(a) Alveoli
(b) Bronchi
(c) Pleura
(d) Trachea
2617: Poliomyelitis is an epidemic virus infection. Which of the following is responsible for it?
(a) Rhabdo virus
(b) Entero virus
(c) Dengue virus
(d) Mumps virus
2618: Examine the following statements :
I. All members of Mohan's family are honest.
II. Some members of Mohan's family are not employed.
III. Some employed persons are not honest.
IV. Some honest persons are not employed.
Which of the following inferences can be drawn from the above statements ?
(a) All members of Mohan's family are employed
(b) The employed members of Mohan's family are honest
(c) The honest members of Mohan's family are not employed
(d) The employed members of Mohan's family are not honest
2619: Antigen is a substance which
(a) destroys harmful bacteria
(b) is used to treat poisoning
(c) lowers body-temperature
(d) stimulates formation of antibody
2620: Who led the extremists before the arrival of Gandhiji on the political scene for freedom struggle?
(a) Bal Gangadhar Tilak
(b) Dadabhai Naoroji
(c) Gopal Krishna Gokhale
(d) Subhash Chandra Bose