181. The PH of milk is __________?
A. 6.0
B. 6.5
C. 7.0

182. What is the third most common gas found in the air we breathe ________ ?
A. Hydrogen
B. Neon
C. Carbondioxide
D. Argon

183. What is the molecular formula for Ammonia?
B. NH2
C. NH3
D. NH4

184. What is the molecular weight of Ammonia (NH3) ________ ?
A. 17.031 g/mol
B. 18.031 g/mol
C. 19.031 g/mol
D. 27.033 g/mol

185. The absolute value of charge on electron was determined by ________ ?
A. J.J.Thomson
B. Chadwick
C. Rutherford
D. Robert Millikan

186. The discovery of neutron became very late because _______ ?
A. It does not carry any charge
B. It does not move
C. It is a fundamental particle
D. It is present in nucleus

187. The scientific study of fingerprints is called _________ ?
A. Dactylography
B. Dactylology
C. Dactyliology
D. Dialectology

188. The medical branch of science that deals with the study of skin, its functions, diseases, & treatment is ________ ?
A. Dermatology
B. Dormatology
C. Deontology
D. Dermatoglyphics

189. What is the molecular formula for Nitric acid ________ ?
C. HN2O2
D. H2NO4

190. Stethoscope was invented by _______ ?
A. Rene Laennec
B. Steven Sasson
C. Martin Cooper
D. Dave Hyatt