Science Quiz from 156 to 160

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156. Ships use ________ to find the depth of the ocean beneath them.
(A) pitches
(B) echoes
(C) frequencies
(D) none of these

157. Molecules with identical molecular formulae but with different structural formulae are called
(A) Isomers
(B) Isotopes
(C) Atomic number
(D) Mass number

158. The anode is the electrode connected to the ________ terminal of a battery.
(A) positive
(B) negative
(C) neutral
(D) free

159. The unit used to measure humidity is
(A) Barometer
(B) Hydrometer
(C) Hygrometer
(D) Galvanometer

160. Laser was invented by
(A) Alessandro Volta
(B) William Sturgeon
(C) Hero of Alexandria
(D) Theodore Maiman

ANSWERS: SCIENCE QUIZ
156. (B) echoes
157. (A) Isomers
158. (A) positive
159. (C) Hygrometer
160. (D) Theodore Maiman