181. The PH of milk is __________?
182. What is the third most common gas found in the air we breathe ________ ?
183. What is the molecular formula for Ammonia?
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 ________ ?
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 _________ ?
188. The medical branch of science that deals with the study of skin, its functions, diseases, & treatment is ________ ?
189. What is the molecular formula for Nitric acid ________ ?
190. Stethoscope was invented by _______ ?
A. Rene Laennec
B. Steven Sasson
C. Martin Cooper
D. Dave Hyatt