181. The PH of milk is __________?
A. 6.0
B. 6.5
C. 7.0
D.7.5

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?
A. NH
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 ________ ?
A. HNO2
B. HNO3
C. HN2O2
D. H2NO4

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

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