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16 . Which instrument is used to measure viscosity of liquid?
A. Voltmeter B. Wattmeter
C. Wavemeter D. Viscometer

17 . Which instrument is used in submarine to see the objects above sea level ?
A. Periscope B. Polygraph
C. Pykometer D. Photometer

18 . Which instrument is used to determine the density and coefficient of expansion of liquids?
A.
Periscope
B. Polygraph
C. Pykometer
D. Photometer

19 . Which instrument is used to record changes in heartbeat, blood-pressure and respiration
A. Periscope B. Polygraph
C. Pykometer D. Photometer

20 . Which instrument is used to compare luminous intensity of the source of light?
A. Periscope B. Polygraph
C. Pykometer D. Photometer




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